TOHOKU UNIVERSITY Researchers

Shin Yabukami

Section

Graduate School of Biomedical Engineering

Job title

Professor

Degree

博士（工学）（東北大学）
修士（工学）（東北大学）

researchmap

https://researchmap.jp/read0055353

J-GLOBAL ID

200901037991537154

e-Rad No.

00302232

Research History 4

2018/04 - Present

Tohoku University　Graduate School of Biomedical Engineering
2010/04 - 2018/03

Tohoku Gakuin University　Faculty of Engineering
2006/04 - 2010/03

Tohoku Gakuin University　Faculty of Engineering
1998/04 - 2006/03

東北大学電気通信研究所　助手

Education 3

Tohoku University

1995/04 - 1998/03
Tohoku University

1993/04 - 1995/03
Tohoku University　Faculty of Engineering

1988/04 - 1993/03

Committee Memberships 29

電気学会ナノスケール磁性体の構造・組織解析と創製調査専門委員会　委員

2016/07 - Present
日本磁気学会　論文委員会主査（計測高周波デバイス分野）

2008/04 - Present
日本磁気学会　編集委員会委員

2005/04 - Present
電気学会磁気センサの高機能とシステム化調査専門委員会　委員長

2017/04 - 2020/03
電気学会強磁界下での材料プロセッシングと生体効果調査専門委員会　委員

2015/04 - 2018/03
The 4th International Conference of Asian Union of Magnetics Societies (IcAUMS 2016)　Program Committee

2016/04 - 2017/03
電気学会次世代スマートデバイス構築のための高周波磁気調査専門委員会　委員

2014/04 - 2017/03
電気学会磁気センサの高機能化と応用調査専門委員会　副委員長

2014/01 - 2016/12
電気学会ナノスケール磁性体の新物性と新機能性の応用調査専門委員会　委員

2013/07 - 2016/06
IEEE International Magnetics Conference (INTERMAG 2015)　Session Chair

2014/12 - 2015/06
電気学会磁気を用いた新たなる診断・治療機器創出のための技術調査専門委員会　委員

2012/04 - 2015/03
電気学会オンチップＲＦマグネティックス調査専門委員会　委員

2011/04 - 2014/03
電気学会磁気応用による医療へのシーズ技術調査専門委員会　委員

2009/04 - 2012/03
IEEE International Magnetics Conference (INTERMAG 2011)　Session Chair

2010/12 - 2011/06
The 2nd International Symposium on Advanced Magnetic Materials and Applications (ISAMMA 2010)　Program Committee

2010/01 - 2010/07
電気学会ナノスケール磁性体の構造・組織制御と機能・応用調査専門委員会　委員

2007/07 - 2010/06
日本磁気学会　学術講演会実行委員

2008/04 - 2010/03
電気学会磁気利用センシングシステム高機能化調査専門委員会　委員

2006/12 - 2009/11
IEEE International Magnetics Conference (INTERMAG 2009)　Session Chair

2008/12 - 2009/06
電気学会マイクロ磁気デバイスの情報通信機器への応用調査専門委員会　幹事

2005/04 - 2008/03
日本磁気学会　論文委員会副主査（生体磁気分野）

2006/04 - 2007/03
電気学会基礎・材料・共通部門論文委員会　主査

2006/04 - 2007/03
電気学会基礎・材料・共通部門論文委員会　副主査

2005/04 - 2006/03
電気学会磁気利用センシングシステム調査専門委員会　委員

2003/04 - 2006/03
電気学会基礎・材料・共通部門論文委員会　幹事

2002/04 - 2005/03
電気学会次世代超高周波マイクロ磁気デバイス調査専門委員会　幹事

2002/04 - 2005/03
電気学会電磁機器基盤解析技術調査専門委員会　委員

2001/04 - 2003/03
電気学会マイクロ磁気デバイスのシステム化調査専門委員会　幹事補佐

1999/04 - 2002/03
東北大学電気通信研究所スピニクス研究会　幹事

2000/04 - 2001/03

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Professional Memberships 4

Institute of Electrical and Electronics Engineers (IEEE)
JAPAN BIOMAGNETISM AND BIOELECTROMAGNETICS SOCIETY
THE MAGNETICS SOCIETY OF JAPAN
電気学会

Research Interests 6

モーションキャプチャ
磁性薄膜
センサ
motion capture
magnetic film
sensor

Research Areas 1

Manufacturing technology (mechanical, electrical/electronic, chemical engineering) / Electronic devices and equipment /

Awards 7

石田記念財団研究奨励賞

2011/12　石田(實)記念財団　室温で動作する高感度薄膜磁界センサの開発
船井情報科学振興賞

2007/04　船井情報科学振興財団　室温で動作し10^-13Ｔ台の磁界検出分解能を有する薄膜磁界センサ
インテリジェント・コスモス奨励賞

2005/05　インテリジェント・コスモス学術振興財団　超高感度薄膜磁界センサシステムの研究
電気学会論文発表賞

2003/03　電気学会　複数の永久磁石を用いた5自由度顎運動計測装置の開発
トーキン科学技術振興財団研究奨励賞

2000/03　トーキン科学技術振興財団　高周波キャリア型薄膜磁界センサおよび磁気モーションキャプチャシステムの研究
電気学会論文発表賞

1996/03　電気学会　マイクロストリップコイルを用いた高周波磁界センシング
IEEE Student Travel Award

1995/04　Institute of Electrical and Electronics Engineers (USA)　High frequency Magnetic Field Sensing Coil Using Microstrip Line

Show all ︎Show 5

Papers 175

Dumbbell-like Au–Fe3O4 nanoparticles for magnetic hyperthermia

Loi Tonthat, Tomoyuki Ogawa, Shin Yabukami

AIP Advances　14　(1)　2024/01/01
Publisher: AIP Publishing
DOI： 10.1063/9.0000821 　

eISSN：2158-3226

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Dumbbell-shaped hybrid nanoparticles, consisting of gold and iron oxide (Au-Fe3O4 NPs), show promise for magnetic hyperthermia cancer therapy. However, conventional synthesis methods using toxic iron pentacarbonyl (Fe(CO)5) raise safety concerns. We propose a safer approach using triiron dodecacarbonyl (Fe3(CO)12) as a precursor. We synthesize these NPs by initially reducing gold (III) chloride trihydrate with a tert-butylamine-borane complex at room temperature, yielding Au NPs. These Au NPs are combined with a Fe3(CO)12 solution and heated to 300 °C for 1 hour, resulting in the desired dumbbell-shaped Au-Fe3O4 NPs. Characterization confirms their morphology, with average sizes of 5 nm for Au NPs and 15 nm for Fe3O4 NPs. Our systematic evaluation of hydrophilic-treated Au-Fe3O4 NPs (Ms=49.5 emu/g at 3T, 300K) demonstrates temperature increases beyond the therapeutic threshold of 45 °C (ΔT=8 °C) at higher field strengths (8.6–30.0 kA/m), highlighting their cancer treatment potential. Quantitative analysis reveals superb performance, with a specific absorption rate (SAR) of 60.0 W/g and intrinsic loss power (ILP) of 0.25 nHm2kg−1 at the maximum field strength. These findings emphasize the significant potential of our dumbbell-shaped Au–Fe3O4 NPs for magnetic hyperthermia.
Magnetic Susceptibility-Based Detection of Fusobacterium nucleatum in Human Saliva Peer-reviewed

Kazuhiko Okita, Pu Youcheng, Loi Tonthat, Toru Murayama, Shin Yabukami, Yohei Ozawa, Seji Asamitsu, Hiroshi Okamoto, Takashi Kamei

IEEE Magnetics Letters (Early Access)　1-5　2023/08/23
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
DOI： 10.1109/LMAG.2023.3308062 　

ISSN：1949-307X

eISSN：1949-3088

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This paper presents an innovative method for rapid and precise measurement of bacteria in liquid samples for point-of-care testing. The method utilizes the bacteria concentration-dependent ac susceptibility of magnetic nanoparticles, allowing for efficient and practical bacterial detection. The ac susceptibility of the magnetic nanoparticles/bacteria aggregate exhibits a decrease proportional to the bacteria concentration, attributed to the influence of bacteria on the magnetic coupling between the magnetic nanoparticles and magnetic dynamic response of the aggregate. To validate the performance of our method, we conducted measurements on Fusobacterium nucleatum samples obtained from both healthy individuals and cancer patients. The results demonstrated a robust correlation (correlation factor up to 0.94) between our measurements and the results obtained through qPCR analysis, highlighting the high precision and accuracy of our method in quantifying bacteria, which is comparable to a qPCR system. The simplified apparatus not only reduces costs but also saves time by eliminating the need for DNA amplification of short segments, making it a promising alternative for rapid and precise bacterial measurement in point-of-care testing.
Highly Sensitive Bio-Detection Utilizing Magnetic Phase Transition by Aggregates of Magnetic Nanoparticles and Biomolecules Invited

Loi Tontha, Shin Yabukami

The Journal of The Institute of Electrical Engineers of Japan　143　(8)　496-499　2023/08/01

DOI： 10.1541/ieejjournal.143.496 　
AC Magnetic Field Detection of Coplanar Line Type Thin Film Magnetic Field Sensor with Optimized Narrow Slits

Ryota Suzuki, Masaya Sakamoto, Tomoya Ishihara, Junichi Honda, Shin Yabukami

2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers)　2023/05
Publisher: IEEE
DOI： 10.1109/intermagshortpapers58606.2023.10228554 　
Ultrafast Heating Rate of Ultrasmall Gold-coated Iron Oxide Magnetic Nanoparticles by Ferromagnetic Resonance

Loi Tonthat, Akihiro Kuwahata, Tomoyuki Ogawa, Shin Yabukami

2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers)　1-1　2023/05
Publisher: IEEE
DOI： 10.1109/intermagshortpapers58606.2023.10228356 　

ISSN：0018-9464

eISSN：1941-0069
Ultrasmall Fe3O4@Au Composite Nanoparticles with Different Sizes of Fe3O4 for Magnetic Hyperthermia

Loi Tonthat, Tomoyuki Ogawa, Shin Yabukami

2023 IEEE International Magnetic Conference - Short Papers (INTERMAG Short Papers)　1-1　2023/05
Publisher: IEEE
DOI： 10.1109/intermagshortpapers58606.2023.10228777 　

ISSN：0018-9464

eISSN：1941-0069
研究グループ紹介：東北大学大学院医工学研究科・工学研究科薮上・桑波田研究室

Ton That Loi, 晃弘桑波田, 信薮上

IEEJ Transactions on Fundamentals and Materials　143　(4)　NL4_4-NL4_4　2023/04/01
Publisher: Institute of Electrical Engineers of Japan (IEE Japan)
DOI： 10.1541/ieejfms.143.nl4_4 　

ISSN：0385-4205

eISSN：1347-5533
Wide Microstrip Line Type Probe With Slits and Permeability Evaluation of Thick Magnetic Material

M. Sakamoto, A. Mashiko, Y. Watanabe, K. Sakuma, K. Okita, S. Yabukami, K. Chatani

IEEE Transactions on Magnetics　59　(2)　1-4　2023/02
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
DOI： 10.1109/tmag.2022.3210231 　

ISSN：0018-9464

eISSN：1941-0069
Ultra-short pulse magnetic fields on effective magnetic hyperthermia for cancer therapy

A. Kuwahata, Y. Adachi, S. Yabukami

AIP advances　13　(2)　2023/02
Evaluation of coplanar line type thin film magnetic field sensor with narrow slits

Masaya Sakamoto, Ryota Suzuki, Tomoya Ishihara, Junichi Honda, Shin Yabukami

AIP Advances　13　(2)　2023/02/01
Publisher: AIP Publishing
DOI： 10.1063/9.0000575 　

eISSN：2158-3226

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We have proposed coplanar line type thin-film magnetic field sensor with narrow slits. The slit is employed to flow more carrier current on the signal line by improving the impedance matching. Several sensors having 6, 10, 26, 36, and 50 μm slit widths were fabricated and evaluated from the phase and the amplitude of the transmission coefficient (S21) and reflection coefficient (S11) measured by the network analyzer. The amplitude of S21 with slit was improved about five times larger than the sensor without one at around 2 GHz. The appropriate slit width was evaluated as around 10 μm for the coplanar line type thin film magnetic field sensor and the sensitivity will enhance more than 10 times higher than the sensor without slits.
Rapid virus detection using magnetic second harmonics of superparamagnetic iron oxide nanoparticles

Ryuichi Hirota, Toru Murayama, Ryota Katsumi, Tokuhisa Kawawaki, Shin Yabukami, Ryuji Igarashi, Yuichi Negishi, Moriaki Kusakabe, Masaki Sekino, Takashi Yatsui, Akihiro Kuwahata

AIP Advances　13　(2)　2023/02
Publisher: AIP Publishing
DOI： 10.1063/9.0000483 　

eISSN：2158-3226

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Virus detection methods based on nonlinear magnetic response of magnetic nanoparticles have been investigated, and magnetic detection methods using the third harmonic are widely applied, owing to their high sensitivity and short measurement time. This paper proposes a virus detection method based on the second harmonic because of its larger signal component. We found that the second harmonic signal is superior to the third harmonic signal for small nanobeads and a large change of the second harmonic signal in the signal-to-noise ratio (SNR) with nanobeads concentration. In addition, a virus detection limit of 100 pg/ml is achieved. Therefore, the proposed method can potentially be utilized for rapid screening of viruses.
Method for Measuring Magnetic Susceptibility of Magnetic Nanoparticles up to Millimeter-Wave Frequency Range Peer-reviewed

Youcheng Pu, Loi Tonthat, Toru Murayama, Kazuhiko Okita, Shin Yabukami

AIP Advances　13　(2)　025129-1-025129-6　2023/02
Publisher: None
DOI： 10.1063/9.0000589 　

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A novel method for measuring the complex magnetic susceptibility of magnetic nanoparticles (MNPs) has been developed by a broadband microstrip line-type probe with a frequency range of up to 50 GHz. Two external orthogonal DC fields, Hhard and Heasy, were applied to change the susceptibility of MNPs (Streptavidin coated, 200 nmϕ, number of MNPs about 1010) based on magnetization switching theory. The susceptibility of MNPs in the liquid, solid state, and after biotin-avidin reaction with polymer beads (2 μmϕ, number of polymer beads about 108) was evaluated. A clear FMR frequency of MNPs and the same FMR frequency shift trend as Hhard changed was observed around 2–10 GHz in both liquid and solid states. The susceptibility of MNPs reached maximum when Hhard was 0.1 T which is approximately equal to Heasy (0.135 T). The maximum values of real and imaginary parts increased by a factor of 3.39 and 1.66 compared to when Hhard was 0. The obtained results indicate that the magnetic anisotropy was successfully controlled in the liquid and solid states of MNPs aggregate. Furthermore, after the biotin-avidin reaction of MNPs with polymer beads, the imaginary part of susceptibility showed a decreasing trend regardless of the increase in Hhard, and its half-width expanded by 35.1% at maximum when Hhard was 0.15 T.
A simple antigen-antibody reaction using ultrasmall FeCo nanoparticles

Loi Tonthat, Toru Murayama, Nobukiyo Kobayashi, Shin Yabukami, Wakako Ikeda-Ohtsubo, Ken Ichi Arai

AIP Advances　13　(2)　025009-025009　2023/02/01
Publisher: AIP Publishing
DOI： 10.1063/9.0000569 　

eISSN：2158-3226

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In this study, we prepared ultrasmall FeCo nanoparticles (NPs) with a high magnetic moment and examined their antigen-antibody reaction for biodetection applications. The FeCo NPs were collected from the FeCo-BaF2 nanogranular film with Fe:Co:Ba:F = 14:11:21:54 at.%, by dissolving the film in water since the BaF2 matrix was deliquescent. The size of FeCo NPs was ∼5 nm and the saturation magnetization was estimated to be ∼15.30 kG (149.0 emu/g). The Candida albicans antibodies (abcam ab53891)-conjugated FeCo NPs were collected by using an ultracentrifugal separation (110 000 rpm, 90 min), they were then reacted with Candida albicans. The obtained result indicates that Candida albicans were absorbed successfully onto FeCo NPs, and the number of Candida albicans bound to FeCo NPs counted from the micrographs of the aggregates of FeCo NPs and Candida albicans increased significantly by adding sonication treatment of the film in water before binding them to the antibodies. The success of antigen-antibody reaction of ultrasmall NPs with high magnetic moment improves detection sensitivity as well as offers potential detection for smaller biomolecules.
Wireless temperature monitoring by using magnetic nanoparticles for biomedical applications on magnetic hyperthermia treatment

Akihiro Kuwahata, Ryuichi Hirota, Ariunbuyan Sukhbaatar, Tetsuya Kodama, Shin Yabukami

AIP Advances　13　(2)　025142-025142　2023/02/01
Publisher: AIP Publishing
DOI： 10.1063/9.0000557 　

eISSN：2158-3226

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Magnetic hyperthermia with magnetic nanoparticles (MNPs) has been introduced to selective treatment of tumor and the MNPs also has demonstrated diagnosis. For non-invasive treatment, a therapeutic platform with temperature monitoring that can avoid overheating in normal tissues is of vital importance. In this study, we have developed a wireless temperature monitoring system by utilizing the combination of magnetic harmonic signals of the MNPs for magnetic hyperthermia treatment in laboratory experiments. We achieved an accurate measurement with an error of 0.18 °C. For practical use on breast/oral cancer, a detectable distance of at least 10 mm is required. To demonstrate the feasibility toward future biomedical applications, we investigated the dependency on the amount of Resovist® and the error is less than 0.5 °C in a 10 mm distance. Our system can measure the correct temperature regardless of Resovist amount. The results indicate that our system can apply for monitoring temperature on magnetic hyperthermia treatment.
Development of gold-coated magnetic nanoparticles as a theranostic agent for magnetic hyperthermia and CT imaging applications

Loi Tonthat, Mone Kimura, Tomoyuki Ogawa, Narufumi Kitamura, Yoshio Kobayashi, Kohsuke Gonda, Shin Yabukami

AIP Advances　13　(2)　025239-025239　2023/02/01
Publisher: AIP Publishing
DOI： 10.1063/9.0000592 　

eISSN：2158-3226

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In this study, we aim to develop gold-coated Fe3O4 nanoparticles (Fe3O4@Au NPs) as theranostic agents for magnetic hyperthermia and CT imaging applications. The Fe3O4 NPs were synthesized via thermal decomposition method, and the gold was then deposited onto the surface of Fe3O4 NPs by reducing gold acetate at 190 °C. The average sizes of Fe3O4 and Fe3O4@Au NPs were 5.2 nm and 6.1 nm, respectively, which are effectively removed by the kidneys. The magnetization of Fe3O4@Au NPs (9.7 emu/g-Fe3O4) at 300 K was much smaller than that of Fe3O4 NPs (52.4 emu/g-Fe3O4). The heating efficiency of Fe3O4@Au NPs in water was sufficient to treat the tumor at 43–45 °C, and their high CT value of 851 HU was obtained. The synthesized ultrasmall Fe3O4@Au NPs showed great promise as a potential theranostic agent for magnetic hyperthermia and CT imaging applications.
Ferromagnetic resonance heating of magnetic nanoparticles Resovist for biomedical applications

Akihiro Kuwahata, Weronika Szawro, Takayuki Kagami, Masaharu Takahashi, Shin Yabukami

IEEE Transactions on Magnetics　1-1　2023
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
DOI： 10.1109/tmag.2023.3285234 　

ISSN：0018-9464

eISSN：1941-0069
Development of a compact magnet for applying a highly uniform magnetic field to a diamond magnetic sensor by inverse problem analysis

Haruki Tanaka, Yuma Murata, Shin Yabukami, Akihiro Kuwahata

13　(1)　2023
高周波パルス磁界印加による磁性粒子の加熱

安達友威, 桑波田晃弘, 薮上信, 中村英滋

日本磁気学会論文特集号　7　(1)　102-107　2023

DOI： 10.20819/msjtmsj.23TR519 　
Method for Rapid Detection of Bacteria Using Magnetic Nanoparticle Aggregates

Y. Pu, H. Zhao, T. Murayama, L. Tonthat, K. Okita, Y. Watanabe, S. Yabukami

Journal of the Magnetics Society of Japan　2023
Publisher: The Magnetics Society of Japan
DOI： 10.3379/msjmag.2305r003 　

ISSN：1882-2924

eISSN：1882-2932
Resonance frequency above 20 GHz in superparamagnetic NiZn-ferrite

Sarath Arackal, Kouhei Nozawa, Ralandinliu Kahmei, Ton That Loi, Shin Yabukami, S. A. Shivashankar, Masahiro Yamaguchi, Navakanta Bhat, Ranajit Sai

Applied Physics Letters　121　(6)　062402-062402　2022/08/08
Publisher: AIP Publishing
DOI： 10.1063/5.0102965 　

ISSN：0003-6951

eISSN：1077-3118

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We investigate the frequency dispersion of complex permeability in the GHz range in superparamagnetic nickel–zinc ferrite thin films with different Ni/Zn ratios using a microstrip probe. The films, comprising crystallites as small as 3 nm and deposited by a microwave-irradiation-assisted solvothermal method, exhibit the coexistence of two resonance characteristics—a ferromagnetic resonance peak ([Formula: see text]) at ∼2 GHz and a superparamagnetic resonance peak ([Formula: see text]) above 20 GHz, breaching Snoek's limit. The high value of [Formula: see text] is attributed to the high surface anisotropy and far-from-equilibrium distribution of cations in the lattice, while [Formula: see text] is attributed to the thermally driven superparamagnetic relaxation of ferrite nanocrystallites in the thin films. This work demonstrates the feasibility of employing superparamagnetic ferrite thin films so deposited as excellent CMOS-integrable magnetic components for high-speed and high-frequency electromagnetic device applications.
Virus Detection using Second Harmonics of Magnetic Nanoparticles Peer-reviewed

Ryuichi Hirota, Toru Murayama, Ryota Katsumi, Tokuhisa Kawawaki, Shin Yabukami, Ryuji Igarashi, Yuichi Negishi, Moriaki Kusakabe, Masaki Sekino, Takashi Yatsui, Akihiro Kuwahata

IEEJ Transactions on Electrical and Electronic Engineering　2022/04/12
Publisher: Wiley
DOI： 10.1002/tee.23613 　

ISSN：1931-4973

eISSN：1931-4981

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Virus detection methods based on the nonlinear magnetic response of magnetic nanoparticles have been investigated, and magnetic detection methods using the third harmonic have been widely applied on account of their high sensitivity, short measurement-time, and low cost. In this letter, we propose a virus detection method using the second harmonics to improve the signal intensity. We find that the signal to noise ratio of the second harmonic is approximately three times higher than that of the third harmonic. A comparison of the ratio of the second harmonic to the fourth harmonic (R24) and the ratio of the third harmonic to the fifth harmonic (R35) shows that R24 is more sensitive to identifying changes in virus concentration. Our proposed method has the potential to be utilized for rapid screening on virus detection. © 2022 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.
Analysis of Demagnetizing Effects on Microstrip Line Type Probe for the Permeability Measurement of Thick Specimen

Takagi, M. Sakamoto, T. Ishihara, K. Okita, S. Yabukami, M. Yamaguchi, K.Chatani

Journal of the Magnetics Society of Japan　46　(6)　102-106　2022
Publisher: The Magnetics Society of Japan
DOI： 10.3379/msjmag.2211r002 　

ISSN：1882-2924

eISSN：1882-2932
Simultaneous Evaluation of Permeability and Permittivity using a Flexible Microstrip Line-Type Probe up to 67 GHz

S. Yabukami, C. Iwasaki, K. Nozawa, S. Takahashi, K. Okita, K. Chatani

IEEE Transactions on Magnetics　58　(2)　6100305　2022
Analysis of coplanar line type thin film magnetic field sensor by electromagnetic field simulation

T. Ishihara, H. Uetake, J. Honda, S. Yabukami, M. Yamaguchi

Journal of Magnetic of Japan　6　(1)　28-33　2022
磁気温熱療法の定温加熱制御システムを用いた動物実験

鹿野晃弘, トンタットロイ, 桑波田晃弘, アリウンブヤンスフバートル, 小玉哲也, 薮上信

日本磁気学会論文特集号　6　(1)　101-104　2022
A detection and analysis of Fusobacterium utilizing changes in the magnetic properties of magnetic nanoparticles-antibody-antigen aggregates

S. Yabukami, T. Murayama, S. Takahashi, S. Ohno, J. Washio, N. Takahashi

IEEE Transactions on Magnetics　58　1-1　2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
DOI： 10.1109/tmag.2022.3161508 　

ISSN：0018-9464

eISSN：1941-0069
A correction of measurement for complex magnetic permeability by direct contact probe Peer-reviewed

Z. Wang, T. Ishihara, K. Okita, S. Yabukami

Journal of Magnetic of Japan　46　(4)　85-89　2022
Simplified fabrication of magnetic nanoparticles with directly adsorbed antibodies for bacteria detection

Tsuyoshi Yoneyama, Akihiro Kuwahata, Toru Murayama, Loi Tonthat, Shin Yabukami, Yuya Sato, Yuji Teramura, Wakako Ikeda-Ohtsubo, Tomoyuki Ogawa

IEEE Transactions on Magnetics　58　(8)　1-1　2022
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
DOI： 10.1109/tmag.2022.3168360 　

ISSN：0018-9464

eISSN：1941-0069
Dynamical magnetic behavior of anisotropic spinel‐ structured ferrite forGHz technologies Peer-reviewed

YukikoYasukawa, Kouhei Nozawa, TaneliTiittanen, Maarit Karppinen, Johan Linden, Sagar E. Shirsath, ShinYabukami

scientific reports　11:614　2021/12
Investigating R&D Committee on Magnetic Sensors for High-Performance and Systemization

Shin Yabukami, Kunihisa Tashiro, Hiroaki Kikuchi, Akinobu Yamaguchi

IEEJ Transactions on Fundamentals and Materials　141　(8)　443-445　2021/08/01
Publisher: Institute of Electrical Engineers of Japan (IEE Japan)
DOI： 10.1541/ieejfms.141.443 　

ISSN：0385-4205

eISSN：1347-5533
A Simple and High‐Accuracy PID ‐Based Temperature Control System for Magnetic Hyperthermia Using Fiber Optic Thermometer

Akihiro Shikano, Loi Tonthat, Shin Yabukami

IEEJ Transactions on Electrical and Electronic Engineering　2021/03/29
Publisher: Wiley
DOI： 10.1002/tee.23361 　

ISSN：1931-4973

eISSN：1931-4981
Animal Experiment with PID-based Automatic Temperature Control System for Magnetic Hyperthermia

A. Shikano, L. Tonthat, A. Kuwahata, A. Sukhbaatar, T. Kodama, S. Yabukami

Journal of the Magnetics Society of Japan　2021
Effect of applied magnetic field on permeability and heating efficiency of multifunctional micro/nano-magnetic particles for hyperthermia therapy

Loi Tonthat, Yoshiyuki Yamamoto, Kazutaka Mitobe, Shin Yabukami

AIP Advances　10　(12)　125324-125324　2020/12/01
Publisher: AIP Publishing
DOI： 10.1063/9.0000123 　

eISSN：2158-3226
Impact of complex permeability measurements up to millimeter-wave frequency range Peer-reviewed

S. Yabukami, K. Nozawa, L. Tonthat, K. Okita, R. Sai

IEEE Transactions on Magnetics　57　(2)　1-1　2020
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
DOI： 10.1109/tmag.2020.3011971 　

ISSN：0018-9464

eISSN：1941-0069
Development of an Automatic Localization System of Magnetic Particles for Hyperthermia Therapy Peer-reviewed

Loi Tonthat, Kazutaka Mitobe, Shin Yabukami

IEEE Transactions on Magnetics　57　(2)　1-1　2020
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
DOI： 10.1109/tmag.2020.3008490 　

ISSN：0018-9464

eISSN：1941-0069
Development of elemental technologies for magnetic hyperthermia in cancer treatment (accepted, in press) Peer-reviewed

Loi Tonthat, Fumitaka Aki, Kazutaka Mitobe, Shin Yabukami, Yoshiyuki Yamamoto

Proceedings of the 11th Asian Pacific Conference on Medical and Biological Engineering (APCMBE 2020)　272-277　2020
Publisher: Springer International Publishing
DOI： 10.1007/978-3-030-66169-4_33 　

ISSN：1680-0737

eISSN：1433-9277
Coplanar line type thin film magnetic field sensor with flip chip bonding (in press) Peer-reviewed

H. Kudo, H. Uetake, H. Onodera, L. Tonthat, K. Okita, S. Yabukami, J. Hayasaka

Journal of the Magnetics Society of Japan　2020
A simple and rapid detection system for oral bacteria in liquid phase for point-of-care diagnostics using magnetic nanoparticles Peer-reviewed

Loi Tonthat, Shunnosuke Takahashi, Hidehiko Onodera, Kazuhiko Okita, Shin Yabukami, Kotone Yokota, Maiko Furuya, Hiroyasu Kanetaka, Yoshinori Miura, Hideki Takahashi, Yoshihiko Watanabe, Ritsuko Akiyama

AIP Advances　9　(12)　125325　2019
Publisher: AMER INST PHYSICS
DOI： 10.1063/1.5130437 　

eISSN：2158-3226

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This study describes a user-friendly and rapid detection system of oral bacteria in the liquid phase for point of care testing based on magnetic immunoassay. We focused on the dependence of the strength of external magnetic field required to switch the magnetic moments of nanoparticles bound to bacteria on the bacteria concentration. The results obtained indicate that the required field strength increases linearly as a function of log concentration of Porphyromonas gingivalis cultured in the range of 10(3)-10(9) CFU/mL. Similarly, the required field strengths for Streptococcus mutans and Pseudomonas aeruginosa increase monotonically when their concentrations increase, whereas the required field strength for Escherichia coli decreases monotonically when its concentration increases. We then measured the concentration of Porphyromonas gingivalis in the saliva collected from elderly people in a geriatric health services facility and the results using the developed system had a correlation with those using a commercial bacteria counter.
Development of the new measurement techinque for spin dynamics of magnetic thin films

Y. Endo, O. Mori, S. Yabukami, R. Utsumi, Y. Shimada

2018 IEEE International Magnetic Conference, INTERMAG 2018　2018/10/24

DOI： 10.1109/INTMAG.2018.8508502 　

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© 2018 IEEE. The spin dynamics in magnetic thin films have attracted much attention from both fundamental and application viewpoints. The dynamics are described using the phenomenological Landau-Lifshitz-Gilbert (LLG) equation consisting of both the precession torque of the magnetization and the damping torque. Especially, a Gilbert damping constant (a), which describes the strength of damping torque, is one of the dominant parameter to predict the dynamics. Until now, we reported the correlation between α and the saturation magnetostriction (λs) for Ni-Fe and Ni-Fe-M films[1]-[3] and found different behaviors of a depending on positive or negative values of λs. To investigate this correlation in more detail, these parameters must be estimated simultaneously for each film using a same measurement instrument. Herein, we proposed a new measurement technique, which employs a microstripe line probe to detect ferromagnetic resonance (FMR) spectra for a magnetic thin film either with tensile stress or stress free, which enables simultaneous evaluation of α and λs
Co/Ti-substituted SrM-based composite sheets: High frequency permeability and electromagnetic noise suppression above 6 GHz Peer-reviewed

Ranajit Sai, Mitsuharu Sato, Shigeru Takeda, Shin Yabukami, Masahiro Yamaguchi

Journal of Magnetism and Magnetic Materials　459　49-56　2018/08/01
Publisher: Elsevier B.V.
DOI： 10.1016/j.jmmm.2017.12.051 　

ISSN：0304-8853

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Co/Ti-substituted Sr-based M-type hexagonal ferrite containing composite sheets are used for the demonstration of electromagnetic noise suppression at and above 6 GHz. Three different compositions (SrCoxTixFe12 − 2xO19 with x = 1.0, 1.2, and 1.4) and two different size groups with the average diameter of ∼10 µm and ∼1 µm have been studied to understand the effect of Co-Ti substitution level and size on the high frequency magnetic characteristics of SrM hexaferrites. A drop in coercivity from 285 Oe to 40 Oe and 710 Oe to 90 Oe was observed as the Co/Ti substitution level, x, increases from 1.0 to 1.4 in the case of 10-µm and 1-µm particles respectively. Complex permeability was measured by two methods – by microstrip probe, and by all-shielded and shorted microstrip line. Ferromagnetic resonance frequency drops from ∼20 GHz to ∼3 GHz as x increases from 1.0 to 1.4, while it decreases a little as the particle size decreases. Electromagnetic noise suppression was demonstrated by measuring the ratio of power loss in the magnetic element to the input power by placing it on top of a microstrip line. With a 500-µm thick composite sheet, electromagnetic noise suppression up to 20% was achieved.
Meandering Coplanar Line Type Thin-Film Magnetic Field Sensor with Direct Bias Peer-reviewed

SHIN YABUKAMI, HIROAKI UETAKE, KENTA MORIYA, TSUYOSHI TOMINAMI, HIDEHIKO ONODERA

Electronics and Communications in Japan　101　(3)　73-79　2018/03
Publisher: Wiley
DOI： 10.1002/ecj.12039 　

ISSN：1942-9533
Study on measurement technique for magnetization dynamics of thin films Peer-reviewed

Yasushi Endo, Osamu Mori, Yutaka Shimada, Shin Yabukami, Shigeyuki Sato, Ryoichi Utsumi

Applied Physics Letters　112　(25)　252403　2018
Publisher: AMER INST PHYSICS
DOI： 10.1063/1.5032305 　

ISSN：0003-6951

eISSN：1077-3118

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This paper describes our proposed measurement technique for the magnetization dynamics in thin films, which employs a microstripe line probe to detect ferromagnetic resonance (FMR) spectra for a film sample either with or without tensile stress. By measurement of FMR frequency shifts using Lorentzian fits to the FMR spectra for a film with and without tensile stress, saturation magnetostriction (lambda(s)) can be determined. The measured values were compared with those estimated by the optical cantilever method using the same samples in good agreement. At the same time, a Gilbert damping constant (alpha) was determined using both the FMR frequency and the FMR linewidth for the tensile stress free film. The results of the experiment demonstrate that our proposed measurement technique allows for more precise evaluation of magnetization dynamics by providing information on both alpha and lambda(s) simultaneously for an individual sample. Published by AIP Publishing.
In-Site Measurement of Permeability and Magnetostrtiction Constant of Magnetic Films Deposited on Si Wafers Peer-reviewed

Mori O., Endo Y., Shimada Y., Yabukami S., Utsumi R.

Transaction of the Magnetics Society of Japan Special Issues　2　(2)　52-55　2018
Publisher: The Magnetics Society of Japan
DOI： 10.20819/msjtmsj.18TR212 　

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 A small microstrip-line probe developed to measure the RF properties of magnetic materials for a wide frequency range has been successfully applied to the on-site permeability measurement of thin films on Si wafers. In this study it is applied to determine the saturation magnetostriction constants of films on Si wafers. The results suggest that on-site and simultaneous measurements of permeability and magnetostriction for films on Si wafers are possible.
Magnetoelectric effect in nanogranular FeCo-MgF films at GHz frequencies Peer-reviewed

Kenji Ikeda, Nobukiyo Kobayashi, Ken-Ichi Arai, Shin Yabukami

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　446　80-86　2018/01
Publisher: ELSEVIER SCIENCE BV
DOI： 10.1016/j.jmmm.2017.08.088 　

ISSN：0304-8853

eISSN：1873-4766

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The magnetoelectric effect is a key issue for material science and is particularly significant in the high frequency band, where it is indispensable in industrial applications. Here, we present for the first time, a study of the high frequency tunneling magneto-dielectric (TMD) effect in nanogranular FeCo-MgF films, consisting of nanometer-sized magnetic FeCo granules dispersed in an MgF insulator matrix. Dielectric relaxation and the TMD effect are confirmed at frequencies over 10 MHz. The frequency dependence of dielectric relaxation is described by the Debye-Frohlich model, taking relaxation time dispersion into account, which reflects variations in the nature of the microstructure, such as granule size, and the inter-spacing between the granules that affect the dielectric response. The TMD effect reaches a maximum at a frequency that is equivalent to the inverse of the relaxation time. The frequency where the peak TMD effect is observed varies between 12 MHz and 220 MHz, depending on the concentration of magnetic metal in the nanogranular films. The inter-spacing of the films decreases with increasing magnetic metal concentration, in accordance with the relaxation time. These results indicate that dielectric relaxation is controlled by changing the nanostructure, using the deposition conditions. A prospective application of these nanogranular films is in tunable impedance devices for next-generation mobile communication systems, at frequencies over 1 GHz, where capacitance is controlled using the applied magnetic field. (C) 2017 The Authors. Published by Elsevier B.V.
Development of New Measurement Technique for Magnetization Dynamics of Magnetic Thin Film Peer-reviewed

Yasushi Endo, Osamu Mori, Shin Yabukami, Ryoichi Utsumi, Yutaka Shimada

Abstract of International Symposium on Advanced Magnetic Materials and Applications (ISAMMA 2017)　1　51　2017/12
Wireless Magnetic Position-Detection System With Four Excitation Coils Peer-reviewed

Yutaro Osaki, Shuichiro Hashi, Shin Yabukami, Hiroyasu Kanetaka, Kazushi Ishiyama

IEEE SENSORS JOURNAL　17　(14)　4412-4419　2017/07
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/JSEN.2017.2707388 　

ISSN：1530-437X

eISSN：1558-1748

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For tracking position or motion of objects in small or shielded spaces, our wireless position-detection system using an LC resonant marker is considered to be effective. Generally, detection of the accurate position of the marker is difficult when reduction of the S/N ratio occurs due to the marker posture. To solve this problem, we propose a system with four excitation coils to generate four-directional magnetic fields whose components are different from each other. To evaluate this system, simulations and experiments were conducted for a single excitation coil and for four excitation coils. In the single excitation coil system, position detection was difficult for some postures of the LC marker due to the greatly reduced excitation efficiency of the marker. In contrast, in the four excitation coil system, the excitation strength of the marker was kept for every marker posture, and position detection was performed with high accuracy even when the marker was placed where the excitation was weakest. Therefore, it is possible to detect the position of the marker accurately regardless of its posture by using four excitation coils. By this improvement, our position-detection system is considered to be useful for tracking finger motion in some applications.
Behavior of sensitivity at edge of thin-film magnetoimpedance element Peer-reviewed

Hiroaki Kikuchi, Suguru Oe, Hiroaki Uetake, Shin Yabukami

AIP ADVANCES　7　(5)　056602-1-056602-5　2017/05
Publisher: AMER INST PHYSICS
DOI： 10.1063/1.4972889 　

ISSN：2158-3226

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We fabricated thin-film magnetoimpedance elements in which an impedance of each 100 mu m section of element can be examined, to investigate impedance changes of each section subjected to a DC magnetic field. The field strength where the impedance peaks shows a larger value at the edge and it decreases toward the center of the element, while the sensitivity is small at the end of the elements and increases toward the center of the element. The obtained results can be explained on a basis of magnetic field simulation and simple impedance model taking into account a distribution of demagnetizing field. A uniformity of demagnetizing field is significant to obtain a higher sensitivity, and intensity of the demagnetizing field strongly affects a magnetic field strength when the impedance peaks. We also clarified an ellipsoidal shape uniform the distribution of demagnetizing field within the element, which contributes to improve the sensitivity of the MI sensor, especially near edge part. (C) 2016 Author(s).
Analysis of thin-film magnetoimpedance behavior in low MHz regions based on domain wall equation and bias susceptibility theory Peer-reviewed

Hiroaki Kikuchi, Chihiro Sumida, Hiroaki Uetake, Shin Yabukami, Shuichiro Hashi, Kazushi Ishiyama

AIP ADVANCES　7　(5)　056617-1-056617-6　2017/05
Publisher: AMER INST PHYSICS
DOI： 10.1063/1.4973760 　

ISSN：2158-3226

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An interesting behavior of thin-film magnetoimpedance elements in the relatively low megahertz (MHz) region is found experimentally when the width of the element is narrow and the thickness of elements is several micrometers. The impedance peaks and inductance shows a rapid drop at around 10 MHz when a bias field is applied to such elements. The impedance profiles of the elements were analyzed on the basis of a domain wall motion equation and bias susceptibility theory. Calculation of the domain wall motion equation when accounting for domain resonance explains the impedance behavior in the low MHz region. The rapid drop in inductance and peak in impedance can be attributed to the domain wall resonance. At a relatively higher frequency, above 100 MHz, the calculation of bias susceptibility while considering ferromagnetic resonance thoroughly explains the experimental behavior. (C) 2017 Author(s).
Permeability Measurements of Thin Film Using a Flexible Microstrip Line-Type Probe Up To 40 GHz Peer-reviewed

S. Yabukami, K. Kusunoki, H. Uetake, H. Yamada, T. Ozawa, R. Utsumi, T. Moriizumi, Y. Shimada

Journal of the Magnetics Society of Japan　41　(2)　25-28　2017
Publisher: The Magnetics Society of Japan
DOI： 10.3379/msjmag.1701R002 　

ISSN：2432-0250

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 A highly sensitive probe based on the skin effect was developed to measure thin film permeability. A new microstrip-line-type probe on a flexible substrate was fabricated and placed in contact with a magnetic thin film. The probe enhanced the signal-to-noise ratio and broadband measurement. The permeability of amorphous CoNbZr film (25 mm × 25 mm, 5 nm thick) and that of CoFeB film (45 mm × 25 mm, 0.5 μm thick) were optimized. The measured values were in rough agreement with theoretical values based on the Landau–Lifshitz–Gilbert equation and eddy current generation up to 40 GHz.
Meandering coplanar line type thin film magnetic field sensor with direct bias Peer-reviewed

Shin Yabukami, Heroaki Uetake, Kenta Moriya, Tsuyoshi Tominami, Hidehiko Onodera

IEEJ Transactions on Fundamentals and Materials　137　(8)　460-465　2017
Publisher: Institute of Electrical Engineers of Japan
DOI： 10.1541/ieejfms.137.460 　

ISSN：1347-5533 0385-4205

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We propose a new simple method to directly apply dc current to the CoNbZr/Cu film of a sensor. A very sensitive thin film sensor was developed using a meandering coplanar line with biasing conductors fabricated from SrTiO film (0.75 μm thick), amorphous Co85Nb12Zr3 film (1.0 mm × 2.45 mm, 1 μm thick) and Cu/Cr film (2 μm/0.1 μm). We discuss direct bias to CoNbZr film and Cu film under a CoNbZr film and compare it with an application of bias magnetic field. Good sensitivity (phase change over 100 degrees/Oe) was obtained by the proposed method.
Magnetoimpedance characteristics on micromachined thin-film elements with length less than 100 um Peer-reviewed

H. Kikuchi, T. Shima, H. Uetake, S. Yabukami

IEEE Magnetics Letters　7　6508105-1-6508105-5　2016/12

DOI： 10.1109/LMAG.2016.2614795 　
バイアス通電によるミアンダコプレーナ線路型薄膜センサの開発

森谷健太, 植竹宏明, 冨並剛, 薮上信

電気関係学会東北支部連合大会講演論文集　2016　235-235　2016
Publisher: 電気関係学会東北支部連合大会実行委員会
DOI： 10.11528/tsjc.2016.0_235 　
Magneto-Impedance of Micromachined Thin Films Less Than 100 mu m in Length Peer-reviewed

Hiroaki Kikuchi, Takuya Shima, Hiroaki Uetake, Shin Yabukami

IEEE MAGNETICS LETTERS　7　6508105　2016
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/LMAG.2016.2614795 　

ISSN：1949-307X

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Thin-film type magneto-impedance (MI) elements having widths and thicknesses of several micrometers and lengths less than 100 mu m in a rectangular shape were fabricated to reduce the demagnetizing effect. Triangular-type MI elements with sensing parts less than 100 mu m in length were also fabricated to facilitate near-field detection with a higher spatial resolution. Rectangular-type elements with widths and lengths of 2 mu m and 30 mu m, respectively, demonstrate a typical MI profile, whereas an element with a 1 mu m width shows a discontinuous impedance change and hysteresis due to incomplete anisotropy control. For the triangular elements, we can suppress the distribution of the demagnetizing factor in the sensing part of the elements and obtain typical MI profiles for 30-100 mu m lengths.
Highly Sensitive Thin-Film Magnetic Field Sensor Meandering Coplanar Line Peer-reviewed

H. Uetake, T. Kawakami, K. Moriya, S. Yabukami, T. Ozawa

IEEE TRANSACTIONS ON MAGNETICS　51　(11)　4005003　2015/11
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/TMAG.2015.2448552 　

ISSN：0018-9464

eISSN：1941-0069

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A very sensitive thin-film sensor was developed using a meandering coplanar line fabricated from Sr33Ti16O51 film (3 mu m thick), amorphous Co85Nb12Zr3 film (1 mmx2.45 mm, 0.3-2 mu m thick), and Cu/Cr film (2/0.1 mu m). The deposited SrTiO film enhanced the sensitivity of a magnetic field sensor, a phase change of more than 30 degrees/Oe and a gain of over -40 dB being achieved simultaneously. The maximum phase change (sensitivity) was observed for a CoNbZr film thickness of similar to 0.5-1 mu m. The sensitive bias field and carrier frequency increased as the CoNbZr film thickness increased. The optimum CoNbZr film thickness was realized by the tradeoff between the sensitive bias field and the volume of the CoNbZr film.
Conceptual Design of Rapid Circular Particle Accelerator Using High-Gradient Resonant Cavities with Fixed Frequency Peer-reviewed

Eiji Nakamura, Tomohiko Asai, Jun’ichi Sekiguchi, Izumi Sakai, Shin Yabukami, Yuta Sasaki, Yusuke Sawaki, Tatsuya Date, Jun Kudo, Tomofumi Ichinomiya, Sho Nakamura, Toshiki Takahashi, Yusuke Bannai, Yoshihiro Ishi, Tomonori Uesugi, Masakazu Takayama, Takeshi Tomomura, Yuma Daikoku, Shou Hashimoto, Haruhisa Koguchi, Shigeru Inagaki, Koichi kindo, Nakamura Tsukasa, Yuko Nakamura

International Journal of Advanced Applied Physics Research　2　(1)　8-18　2015/06/18
Publisher: Cosmos Scholars Publishing House
DOI： 10.15379/2408-977x.2015.02.01.2 　

eISSN：2408-977X
Measurement of internal defects in aluminum using a nano-granular in-gap magnetic sensor Peer-reviewed

T. Ozawa, S. Yabukami, J. Totsuka, S. Koyama, J. Hayasaka, N. Wako, K. I. Arai

JOURNAL OF APPLIED PHYSICS　117　(17)　17A305-1-17A305-4　2015/05
Publisher: AMER INST PHYSICS
DOI： 10.1063/1.4907238 　

ISSN：0021-8979

eISSN：1089-7550

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Techniques for identifying defects in metals are very important in a wide variety of manufacturing areas. The present paper reports an eddy current testing method that employs a nano-granular in-gap magnetic sensor (GIGS) to detect internal defects in aluminum boards. The GIGS consists of a tunnel magnetoresistive film with nanometer sized grains and two yokes. In the presence of an external magnetic field, the nano-granular film exhibits only a small change in resistance due to the tunnel magnetoresistive effect. However, by placing it between two yokes, the magnetic flux can be greatly concentrated, thus increasing the change in resistance. The GIGS is a magnetic-field sensor that exploits this principle to achieve enhanced sensitivity. Moreover, because it has a cross-sectional yolk area of just 80 mu m x 0.5 mu m, it achieves outstanding spatial resolution. In the present study, it is used in combination with an eddy-current method in order to detect internal defects in aluminum. In this method, an excitation coil is used to apply an AC magnetic field perpendicular to the aluminum surface. This induces eddy currents in the metal, which in turn give rise to an AC magnetic field, which is then measured by the GIGS. The presence of defects in the aluminum distorts the eddy current flow, causing a change in the magnitude and distribution of the magnetic field. Such changes can be detected using the GIGS. In the present study, the proposed method was used to successfully detect indentations with diameters of 5 mm on the rear surface of an aluminum plate. (C) 2015 AIP Publishing LLC.
Micromagnetic analysis of dynamic magnetization process in an amorphous wire for MI sensor

UEHARA Yuji, FURUYA Atsushi, SHIMIZU Koichi, FUJISAKI Jun, ATAKA Tadashi, TANAKA Tomohiro, OSHIMA Hirotaka, NAKAYAMA Koji S., YABUKAMI Shin

ITE Technical Report　39　1-5　2015
Publisher: The Institute of Image Information and Television Engineers
DOI： 10.11485/itetr.39.37.0_1 　

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Magnetoimpedance (MI) sensors with ultrahigh sensitivity have been studied for application to wearable computers and medical devices . To realize these applications, it is of prime importance to analyze dynamic magnetization process in amorphous wires. In this paper, we introduce micromagnetic analysis of dynamic magnetization process in an amorphous wire by using the Landau-Lifshitz-Gilbert (LLG) equation taking into account the eddy current field derived from Maxwell's equations. The simulation results are in good agreement with the experimental results.
Enhancement of Sensitivity on Miniaturized Thin-film Magnetoimpedance with Ellipsoidal Element Peer-reviewed

Hiroaki Kikuchi, Suguru Oe, Hiroaki Uetake, Shin Yabukami, Tomoo Nakai, Shuichiro Hashi, Kazushi Ishiyama

20TH INTERNATIONAL CONFERENCE ON MAGNETISM, ICM 2015　75　1271-1278　2015
Publisher: ELSEVIER SCIENCE BV
DOI： 10.1016/j.phpro.2015.12.141 　

ISSN：1875-3892

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We tried to control the distribution of the demagnetizing field inside magnetoimpedance elements fabricated using thin-film to gain higher sensitivity. Elements with quasi-ellipsoidal shape were adopted to modify the demagnetizing field distribution, because it is well known that the demagnetizing field is expected to be uniform in an ellipsoid. The larger impedance change and higher sensitivity were obtained in the ellipsoidal elements compared to those of the conventional rectangular elements. The observed results were analyzed by the calculations on the basis of the distribution of the demagnetizing field and the impedance profile without demagnetizing effect. The calculations well explained the experimental results: the improvement of sensitivity and the performance for the ellipsoidal elements is attributed to the uniform distribution of demagnetizing field. The experimental results demonstrate a potential and the calculation results contribute to optimum design, for a miniaturization of magnetoimpedance element in order to keep the higher sensitivity.
Permeability Measurements of Very Thin Magnetic Film Using a Flexible Microstrip-Line-Type Probe Peer-reviewed

K. Kusunoki, S. Yabukami, T. Ozawa, H. Uetake, H. Yamada, Y. Miyazawa, Y. Shimada

Journal of the Magnetics Society of Japan　39　111-115　2015

DOI： 10.3379/msjmag.1504R005 　
Tracking System for Magnetic Wireless Marker Using Field Programmable Gate Array Peer-reviewed

S. Yabukami, K. Takahashi, T. Ozawa, O. Fujioka, T. Nagano, S. Hashi, H. Kanetaka

Journal of the Magnetics Society of Japan　39　(4)　156-160　2015
Publisher: The Magnetics Society of Japan
DOI： 10.3379/msjmag.1507R001 　

ISSN：1882-2924

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A new tracking system for a wireless magnetic ribbon type marker has been developed by using high-speed analog-to-digital [A/D] converters and a field programmable gate array (FPGA) module. The quality factor of the resonated marker (ribbon: 38 mm in length and 4 mm in width) was about 130. The standard deviation (position accuracy) was smaller than ～1/10 that of the previous system because the sampling frequency of the A/D converters was more than 100 times higher and because the FPGA operated at high speed. The distance between the driving coil and the pickup coil array was ～820 mm, which was ～2.7 times larger than that in the previously reported system. The profile of the marker we obtained was relatively smooth and reasonable up to a distance of 475 mm from the pickup coil array.
Highly Sensitive Coplanar Line Thin-Film Sensor Using SrTiO Film Peer-reviewed

Hiroaki Uetake, Toshiya Kawakami, Shin Yabukami, Tetsuya Ozawa, Nobukiyo Kobayashi, Ken Ichi Arai

IEEE TRANSACTIONS ON MAGNETICS　50　(11)　4007604　2014/11
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/TMAG.2014.2331676 　

ISSN：0018-9464

eISSN：1941-0069

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A very sensitive thin-film sensor was developed using a coplanar line fabricated from SrTiO (Sr33Ti16O51) film (0.5, 1, 2, 3, and 6 mu m thick), amorphous CoNbZr film (5 mu m thick), and Cu/Cr film (4 mu m/0.2 mu m). The deposited SrTiO film had high permittivity of around 31. This film enhanced the sensitivity of the magnetic field sensor, a phase change of more than 100 degrees/Oe and gain of over -40 dB being achieved simultaneously. The sensor with SrTiO film enhanced the sensitivity about 1.6 times greater than that with SiO2 film because of the high permittivity of the SrTiO film. The sensitivity of the sensor increased with increasing thickness of the SrTiO film, a thickness of around 3 mu m being sufficient for enhancement of the sensitivity.
Ferromagnetic resonance in soft-magnetic metallic glass nanowire and microwire Peer-reviewed

Koji S. Nakayama, Tomoaki Chiba, Susumu Tsukimoto, Yoshihiko Yokoyama, Toshiyuki Shima, Shin Yabukami

APPLIED PHYSICS LETTERS　105　(20)　202403-1-202403-4　2014/11
Publisher: AMER INST PHYSICS
DOI： 10.1063/1.4902147 　

ISSN：0003-6951

eISSN：1077-3118

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We report the magneto-impedance measurements in soft-magnetic Co36Fe36B19Si5Nb4 metallic glass nano/micro wires produced by gas atomization. The wire impedance varies with external magnetic fields and the impedance peak position depends on the frequency, indicating ferromagnetic resonance. The postulation of anisotropy directions in ferromagnetic resonance allows to the determination of magnetic anisotropies in the wire. By decreasing the wire diameter, the reduction of magnetic anisotropy is observed. (C) 2014 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.
Coplanar Line Thin Film Sensor and Measurement of MCG without Magnetic Shielding Peer-reviewed

S. Yabukami, K. Kato, T. Ozawa, N. Kobayashi, K. I. Arai

Journal of the Magnetics Society of Japan　38　(2)　25-28　2014
Publisher: The Magnetics Society of Japan
DOI： 10.3379/msjmag.1402R002 　

ISSN：1882-2924

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A very sensitive thin film sensor was developed using a transmission line. The sensor element consists of a coplanar line fabricated from a ceramic substrate and amorphous-CoNbZr film (4 μm in thickness). The ceramic substrate with high permittivity enhanced the phase change in the carrier, and a phase change around 300 degrees/Oe was achieved. A small phase change was detected using a Dual Mixer Time Difference (DMTD) method when a weak magnetic field was applied. The sensor was applied to magnetocardiogram (MCG) measurement without magnetic shielding. Measurement of the MCG signals at 16 points without magnetic shielding were successful, and these signals were found to roughly agree with MCG signals obtained with a SQUID (Superconducting Quantum Interference Device).
Tracking a Nasogastric Tube Inside a Rabbit Using a Wireless Ribbon Marker Peer-reviewed

S. Yabukami, T. Chiba, K. Takahashi, H. Kanetaka, S. Nogami, S. Hashi, K. Yamauchi, T. Ozawa

Journal of the Magnetics Society of Japan　38　(2)　29-32　2014
Publisher: The Magnetics Society of Japan
DOI： 10.3379/msjmag.1402R009 　

ISSN：1882-2924

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A new tracking system utilizing a nasogastric tube with a wireless resonated marker was developed. A narrow marker (2 mm wide and 37 mm long) was fabricated and inserted into a commercial nasogastric tube. A good quality factor of about 136 was obtained. Positional accuracy within about 10 mm was obtained when the marker was scanned for about 100 mm. The nasogastric tube was roughly tracked inside a rabbit. A reasonable and reproducible profile of the tube was measured when the tube was inserted through the mouth into the esophagus of the rabbit.
Highly Sensitive Thin Film Sensor Using Coplanar Line Peer-reviewed

H. Uetake, S. Yabukami, T. Chiba, T. Ozawa, H. Suzuki, N. Kobayashi, K. I. Arai

Journal of the Magnetics Society of Japan　38　(3)　83-86　2014
Publisher: The Magnetics Society of Japan
DOI： 10.3379/msjmag.1404R002 　

ISSN：1882-2924

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A very sensitive thin film sensor was developed using a transmission line. The sensor element consisted of a coplanar line fabricated from Sr33Ti16O51 (STO) film (6 μm thick), morphous CoNbZr film (5 μm thick), and Cu/Cr film (4 μm/0.2 μm). The deposited STO film had high permittivity of around 31. The STO film enhanced the sensitivity of the sensor and a phase change of more than 100 degrees/Oe and gain of over -40 dB were achieved simultaneously. These characteristics are very similar to those of a large sensor with a bulky ceramic substrate6).
Permeability Measurements of Magnetic Thin Film with Microstrip Probe Peer-reviewed

T. Kimura, S. Yabukami, T. Ozawa, Y. Miyazawa, H. Kenju, Y. Shimada

Journal of the Magnetics Society of Japan　38　(3)　87-91　2014
Publisher: The Magnetics Society of Japan
DOI： 10.3379/msjmag.1404R003 　

ISSN：1882-2924

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A highly sensitive and broadband method of obtaining thin film permeability without sample-size limitations was developed based on the change in high-frequency impedance due to the skin effect. A microstrip probe with impedance matching of 50 Ω was fabricated, and placed in proximity to a magnetic thin film. The permeability was optimized with the Newton-Raphson method. The permeability of CoFeB film (45 mm × 25 mm and 0.5 μm in thickness) and that of FeCoB/Ru film (50 mm × 40 mm and 0.2 μm in thickness) were evaluated using a permeameter. The measured values were in rough agreement with theoretical values based on the Landau-Lifshitz-Gilbert equation and eddy current generation up to 30 GHz. The proposed method offers promise for measuring the permeability of wafer-sized samples in line because it is not restricted by size limitations.
医療用モーションキャプチャに使用する磁気マーカの生体適合性評価

冨並香菜子, 金高弘恭, 工藤忠明, 藪上信, 布目祥子

日本バイオマテリアル学会大会予稿集　35回　446-446　2013/11
Publisher: 日本バイオマテリアル学会
Development of Magnetic Crack Detection System Using Thin Film Magnetic Field Sensor Peer-reviewed

Journal of the Magnetics Society of Japan　37　(1)　1-7　2013
Publisher: None
DOI： 10.3379/msjmag.1211R001 　

ISSN：1882-2924
A measurement of magnetocardiogram (MCG) in multi point using a transmission line type thin-film sensor Peer-reviewed

Shin Yabukami, Kazuo Kato, Tetsuya Ozawa, Nobukiyo Kobayashi, Ken Ichi Arai

IEEJ Transactions on Fundamentals and Materials　133　(6)　8-375　2013

DOI： 10.1541/ieejfms.133.372 　

ISSN：0385-4205 1347-5533

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We have developed a very sensitive thin film sensor using a transmission line. The sensor element consists of a coplanar line fabricated from a ceramic substrate and amorphous-CoNbZr film (4 ?m in thickness). The ceramic substrate with high permittivity enhances the phase change of the carrier, phase change around 7000 degree/Oe being achieved. A small phase change was detected using a Dual Mixer Time Difference (DMTD) method when a weak magnetic field are applied. We applied the sensor for magnetocardiogram (MCG) measurement using the phase detection technique. We succeeded in measuring the MCG signals in multi point, including a typical QRS wave and T wave, and this signals were found to roughly agree with already reported MCG data by SQUID. © 2013 The Institute of Electrical Engineers of Japan.
Downsizing of LC Markers for a Wireless Magnetic Position Detection System Peer-reviewed

S. Hashi, S. Yabukami, K. Ishiyama, K. I. Arai

SENSOR LETTERS　11　(1)　98-101　2013/01
Publisher: AMER SCIENTIFIC PUBLISHERS
DOI： 10.1166/sl.2013.2789 　

ISSN：1546-198X

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We have investigated downsizing of the LC resonant magnetic marker of the wireless magnetic position detection system for medical applications. Two shapes of ferrite cores, which are a needle-type and a plate-type, were examined for use in the core of the LC marker. The system was capable of wirelessly detecting the position of downsized small LC markers (except for the ferrite core of 1 mm in diameter and 5 mm in length) with an accuracy on the order of less than 90 mm from the pick-up coil array. Comparison of the prepared cores and the large ferrite core (of 3 mm in diameter and 10 mm in length) as the LC marker revealed that the S/N ratio of the LC marker signal was decreased due to core volume reduction. However, the effect of the demagnetizing factors related to core shape was greater than that of the volume reduction that reduced the S/N ratio and the position accuracy of the system.
A new fast-rise kicker magnet system by a waveform correction method using auxiliary magnets and a three bump orbit correction method Peer-reviewed

Eiji Nakamura, Yuya Sakai, Izumi Sakai, Masakazu Takayama, Shin Yabukami, Yoshihiro Ishi, Tomonori Uesugi, Tsukasa Nakamura, Yoshiaki Nakao, Shigeru Inagaki

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT　665　19-24　2012/02
Publisher: ELSEVIER SCIENCE BV
DOI： 10.1016/j.nima.2011.11.036 　

ISSN：0168-9002

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A fast-rise trial has been performed using auxiliary magnets, which are excited by damped oscillation. There is a possibility to achieve faster rise-time using a simple structure than a delayed line type magnet. A favorable result was obtained by the method. The outline of this scheme and the representative experimental results are described in this paper. (C) 2011 Elsevier B.V. All rights reserved.
GIGS磁界センサを使用した非破壊検査方法の試み

小澤哲也, 薮上信, 戸塚巡, 長田誠一, 直江正幸, 小林伸聖, 金田安司, 荒井賢一

電気関係学会東北支部連合大会講演論文集　2012　259-259　2012
Publisher: 電気関係学会東北支部連合大会実行委員会
DOI： 10.11528/tsjc.2012.0_259 　
Measurements of Broadband Permeability in Thin Film by Using Microstrip Line Probe Peer-reviewed

Sato A., Yabukami S., Ozawa T., Miyazawa Y., Yanagi K., Shimada Y., Munakata M., Shiokawa T.

Transactions of the Magnetics Society of Japan　36　(3)　235-238　2012
Publisher: The Magnetics Society of Japan
DOI： 10.3379/msjmag.1205R012 　

ISSN：1882-2924

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A highly sensitive method of obtaining the permeability of a magnetic film without limitations in sample size was developed based on the skin effect of magnetic film in the vicinity of a microstrip line probe. The permeability of a (Co25Fe75)90B10 thin film (45 x 25 mm, and 0.53 μm thick) was optimized in a frequency range from 10 MHz - 17 GHz; the measured values roughly corresponded to those obtained with the Landau-Lifshitz-Gilbert equation. We analyzed the upper frequency limitations of the permeability measurements using a meander probe, then the impedance mismatching may limit the upper frequency.
Position sensing system using magnetic ribbon type marker Peer-reviewed

Mori O., Yabukami S., Ishii O., Kanetaka H., Ozawa T., Hashi S.

Transactions of the Magnetics Society of Japan　36　(3)　239-244　2012
Publisher: The Magnetics Society of Japan
DOI： 10.3379/msjmag.1205R013 　

ISSN：1882-2924

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A position sensing system of nasogastric tube using a wireless magnetic ribbon type marker has been developed. A Qualityfactor of the marker is 121 which is 13 times higher than conventional LC resonated marker. Position accuracy within 6.4mm was obtained when the marker inside a commercial nasogastic tube was parallel translation to 100mm. The marker inside the tube was roughly tracked in esophagus and in trachea of human model.
Thin Film Permeability Evaluation Based on Skin Effect Using Meander-Type Probe Up to 10.6 GHz Peer-reviewed

S. Yabukami, A. Sato, J. Takahashi, T. Ozawa, Y. Miyazawa, K. Yanagi, Y. Shimada, M. Munakata, T. Shiokawa

IEEE TRANSACTIONS ON MAGNETICS　47　(10)　2570-2572　2011/10
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/TMAG.2011.2158396 　

ISSN：0018-9464

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A highly sensitive and broadband method of obtaining thin film permeability without limitations in sample size was developed based on the high-frequency impedance change because of skin effect. A meander-type probe (3.5 mm x 2.5 mm, 2 turns) was placed in proximity of a (Co(25)Fe(75))(90)B(10) film (45 mm x 25 mm, 0.53 mu m thick), and the permeability was optimized by Newton-Raphson method. The measured values are in good agreements with theoretical values based on the Landau-Lifshitz-Gilbert equation up to 10.6 GHz. The proposed method shows promise for measuring the permeability of wafer-sized samples in line because it is not restricted by size limitations.
Wireless Magnetic Position-Sensing System Using Optimized Pickup Coils for Higher Accuracy Peer-reviewed

S. Hashi, S. Yabukami, H. Kanetaka, K. Ishiyama, K. I. Arai

IEEE TRANSACTIONS ON MAGNETICS　47　(10)　3542-3545　2011/10
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/TMAG.2011.2154313 　

ISSN：0018-9464

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With the aim of improving the detection accuracy of a wireless magnetic position-sensing system using an resonant magnetic marker, a pickup coil with an optimal size (10 mm in diameter x 1 mm thick), as calculated by a previous simulation study, was used and tested in this paper. Our study confirmed that positional errors were reduced to a submillimeter order in the area within y = 120 mm from the pickup coil array. On the contrary, in the area outside y = 130 mm from the pickup coil array, the errors increased by about 0.5-2 mm compared to the results for the previous pickup coil size (25 mm in diameter x 2 mm thick). Regardless of the size of the pickup coil, however, compensation can be made for these positional deviations, including the influence of the mutual inductance between the marker and the exciting coil. After application of the compensation process, the detection results were corrected approximately to the actual positions of the marker.
Fast beam injection and ejection method using a short-pulsed septum magnet for hadron accelerators Peer-reviewed

Eiji Nakamura, Masakazu Takayama, Shin Yabukami

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT　640　(1)　29-37　2011/06
Publisher: ELSEVIER SCIENCE BV
DOI： 10.1016/j.nima.2011.03.022 　

ISSN：0168-9002

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Septum systems are the most important devices for beam injection and extraction in circular particle accelerators. Because of the high-field requirements with a thin septum structure, septa have major problems with heating and cooling of coils and there is a possibility that a mechanical breakdown of coils occurs due to magnetic forces in a pulsed operation. These problems are exacerbated by the long pulse excitation of large inductance magnets because of their multi-turn coils for high-field production, keeping a flat top accuracy of less than 0.1%. Recently the pulsed field techniques of fast rise and field higher than 0.5 T have been realized in the study field of kicker magnet systems, which can be used to solve the above-mentioned problems. This paper focuses on fast beam injection/ejection methods by using a short-pulsed septum magnet. (C) 2011 Elsevier B.V. All rights reserved.
ミアンダ形プローブによる10.8GHzまでの磁性薄膜の透磁率評価

佐藤彰, 薮上信, 小澤哲也, 宮澤安範, 柳邦雄, 島田寛, 宗像誠, 塩川孝泰

電気関係学会東北支部連合大会講演論文集　2011　243-243　2011
Publisher: 電気関係学会東北支部連合大会実行委員会
DOI： 10.11528/tsjc.2011.0_243 　
磁性リボンを用いた位置検出システムの検討

森修, 中野弘道, 薮上信, 石井修, 小澤哲也, 枦修一郎, 金高弘恭

電気関係学会東北支部連合大会講演論文集　2011　244-244　2011
Publisher: 電気関係学会東北支部連合大会実行委員会
DOI： 10.11528/tsjc.2011.0_244 　
高周波キャリア型薄膜磁界センサを利用した磁気探傷の試み

小澤哲也, 谷地館藍, 山田洋, 佐藤弘二, 小島健, 薮上信, 小林伸聖, 中居倫夫, 荒井賢一

電気関係学会東北支部連合大会講演論文集　2011　256-256　2011
Publisher: 電気関係学会東北支部連合大会実行委員会
DOI： 10.11528/tsjc.2011.0_256 　
Position Sensing System of Nasogastric Tube Using Long LC Resonated Marker Peer-reviewed

Sato R., Hayasaka Y., Yabukami S., Ozawa T., Kanetaka H., Hashi S.

Transactions of the Magnetics Society of Japan　35　(2)　67-71　2011
Publisher: The Magnetics Society of Japan
DOI： 10.3379/msjmag.1101R009 　

ISSN：1882-2924

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A position-detecting system made up of a nasogastric tube using a wireless LC resonated magnetic marker has been developed. The marker, consisting of an inductor and a capacitor without battery or electric wires, was installed inside a commercial nasogastric tube. A positioning accuracy within 7.1mm was obtained when the marker inside the tube was parallel translation to 100mm. The marker inside the tube was roughly tracked in the esophagus and trachea of a human model.
Measurement of Permeability of Magnetic Thin Film by Meander-Type Probe Peer-reviewed

Takahashi J., Sato A., Yabukami S., Ozawa T., Miyazawa Y., Yanagi K., Shimada Y.

Transactions of the Magnetics Society of Japan　35　(2)　72-75　2011
Publisher: The Magnetics Society of Japan
DOI： 10.3379/msjmag.1102R001 　

ISSN：1882-2924

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A highly sensitive method of obtaining the permeability of magnetic film without limitations in sample size was developed based on the electrical impedance of magnetic film in contact with microstrip meander lines. The permeability of a CoNbZr thin film (25 × 25 mm, 0.1-μm thick) was evaluated in a frequency range of 100 MHz-8 GHz; the measured values roughly corresponded to those obtained with the Landau-Lifshitz-Gilbert equation. The proposed method shows promise for measuring the permeability of wafer-sized samples because it is not restricted by size limitations.
Scanning System Using Transmission Line Type Thin Film Sensor Peer-reviewed

Sato K., Kojima K., Yabukami S., Ozawa T., Kobayashi N., Nakai T., Arai K.I.

Transactions of the Magnetics Society of Japan　35　(2)　76-81　2011
Publisher: The Magnetics Society of Japan
DOI： 10.3379/msjmag.1102R007 　

ISSN：1882-2924

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We have developed a very sensitive transmission line-type thin film sensor. The sensor, consisting of a coplanar line, SiO2 film, and amorphous CoFeSiB film, was fabricated by sputtering, lift-off, and lithography processes. A phase change of 45 degrees/Oe was obtained at 1 GHz. We arranged two-dimensional stepping motors and developed a scanning system for the sensor. Aluminum samples with through holes were examined by using the eddy current method. Aluminum wires with small Fe balls as impurities were tested by measuring the DC field.
Development of Fast-rise and High-field Kicker Magnet System for Particle Accelerators Peer-reviewed

Nakamura E., Takayama M., Yabukami S., Ichinomiya T., Nakamura S.

Journal of the Magnetics Society of Japan　35　(2)　96-101　2011
Publisher: The Magnetics Society of Japan
DOI： 10.3379/msjmag.1102R005 　

ISSN：1882-2924

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  Various circular high-energy accelerators designed on the synchrotron concept have recently been operated in order to provide high-intensity beams for the studies in fundamental physics, and those for medical purposes, and to drive reactors. The method of fast injection/ejection method by using pulsed magnets is the most fundamental techniques required in such high-energy accelerators. A kicker magnet system is often used in this method, where the magnetic field is a trapezoid with a fast rise-time of less than 1 μs and only has a long flattop for short periods of beam injection/ejection. Those should be zero for almost the entire period except for beam injection and ejection. The operation point of magnetic materials has conventionally been designed at very low fields to prevent magnetization from producing a zero field. Operation over the saturation point of magnetic materials was conducted in this study, and favorable performance, which exceeds that of conventional kicker magnet systems, was obtained. The experimental results are presented in the paper.
Sensitivity Enhancement of Transmission-line Thin-film Sensor by Using High-permittivity Substrate Peer-reviewed

Kojima K., Sato K., Yabukami S., Ozawa T., Kobayashi N., Arai K. I.

Transactions of the Magnetics Society of Japan　35　(3)　277-280　2011
Publisher: The Magnetics Society of Japan
DOI： 10.3379/msjmag.1104R015 　

ISSN：1882-2924

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We have developed a transmission-line thin-film sensor by using a ceramic substrate with high permittivity (εr=115) and amorphous CoNbZr film. We fabricated a coplanar line type sensor with CoNbZr film (25 x 25 mm and 8 μm in thickness). A phase change of 150 degrees/Oe was achieved, which was more than a 10-fold improvement compared with that for a previously reported sensor using a Teflon substrate (εr=5). The signal-to-noise ratio improved and was about 3 times higher than that for the previous sensor when a small AC field (270 pT, 11 Hz) was applied.
Measurement of permeability distribution of magnetic thin film by meander-type probe Peer-reviewed

Junya Takahashi, Shin Yabukami, Tetsuya Ozawa, Yasunori Miyazawa, Kunio Yanagi, Yutaka Shimada

IEEJ Transactions on Fundamentals and Materials　131　(7)　511-516　2011

DOI： 10.1541/ieejfms.131.511 　

ISSN：0385-4205 1347-5533

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A highly sensitive and broadband method of obtaining the permeability of magnetic film without limitations in sample size was developed based on the high frequency impedance of microstrip meander probe and magnetic film. The probe (5.6 mm × 5 mm, 2 turns) was scanned in the vicinity of a CoNbZr thin film (50 × 50 mm, 0.1 μm thick), and the permeability was optimized by Newton-Raphson method in a frequency range of 10 MHz - 8 GHz. The measured values roughly corresponded to theoretical values based on the Landau-Lifshitz-Gilbert equation and eddy current generation. The proposed method shows promise for measuring the permeability of wafer-sized samples in-line because it is not restricted by size limitations. © 2011 The Institute of Electrical Engineers of Japan.
Electric field contributions of fast beam injection and ejection systems for particle accelerators Peer-reviewed

Eiji Nakamura, Masakazu Takayama, Shin Yabukami

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT　624　(3)　554-559　2010/12
Publisher: ELSEVIER SCIENCE BV
DOI： 10.1016/j.nima.2010.09.144 　

ISSN：0168-9002

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The effect of an electric field has been treated as smaller than that of a magnetic field in the control of a high-energy beam orbit and it has been ignored in the magnets of almost all high-energy particle accelerators There is currently a strong demand for high-energy accuracy field performance of the order of 1% in pulsed magnets to suppress beam loss at injection/ejection in high-intensity particle accelerators The effect of the electric field increases as particle energy decreases The electric field induced in a gap of pulsed magnets is complex as its characteristics vary with time and space Here electric field contributions to various kicker magnet systems are summarized (C) 2010 Elsevier B V All rights reserved
Study on the LC marker composed of laminated amorphous ribbon core for a wireless magnetic motion capture system Peer-reviewed

Hashi S, Kamisaka F, Yabukami S, Kanetaka H, Ishiyama K, Arai KI

Journal of Physics: Conference Series　2010

DOI： 10.1088/1742-6596/200/9/092008 　
Analysis and improvement of detection accuracy for a wireless motion sensing system using integrated coil component. Peer-reviewed

Hashi S, Yabukami S, Kanetaka H, Ishiyama K, Arai KI

Journal of Applied Physics　2010

DOI： 10.1063/1.3337706 　
Jaw Tracking System Using Resonated Wireless Markers Peer-reviewed

S. Yabukami, H. Kanetaka, S. Hashi, K. I. Arai, T. Sato

IEEE TRANSACTIONS ON MAGNETICS　45　(10)　4880-4883　2009/10
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/TMAG.2009.2024637 　

ISSN：0018-9464

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We have developed a jaw tracking system with wireless resonated markers. The system consists of two resonated markers, driving coil, 40 pickup coils, DA converter, and AD converters. The two resonated markers were composed of a coil with NiZn ferrite and tip condenser. We attached to one marker on the incisor and the other on the forehead. Position accuracy of within 1 mm was achieved when the fabricated jaw model was moved about 40 mm. This system is available for tracking of reasonable jaw movement of normal subjects without disturbing the physiology.
Numerical Study on the Improvement of Detection Accuracy for a Wireless Motion Capture System Peer-reviewed

S. Hashi, S. Yabukami, H. Kanetaka, K. Ishiyama, K. I. Arai

IEEE TRANSACTIONS ON MAGNETICS　45　(6)　2736-2739　2009/06
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/TMAG.2009.2020541 　

ISSN：0018-9464

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A detection technique having an accuracy of better than I turn is required for body motion analysis in the field of medical treatment. A wireless magnetic motion capture system is one such effective detection technique. We propose a candidate system using an LC resonant magnetic marker (LC marker). Previous studies have showed that the system is capable of repeatable position detection accuracy of better than 1 mm if the system has an adequate signal-to-noise (S/N ratio). However, there are some cases in which the detection results include unignorable errors because some approximations, e.g. a magnetic dipole assumption of the LC marker, are applied to solve the inverse problem to determine the position and orientation of the LC marker. Therefore, a numerical analysis is employed to realize a motion capture system having a high detection accuracy. To elucidate the problem of detection error, the influence of variations in the sizes of the LC marker and the pick-up coil are considered in the numerical simulation. After studying the analysis, the main cause of detection error is determined to be the size of the pick-up coil rather than the size of the LC marker. It was also is found that a pick-up coil measuring 10 mm in diameter with a wound coil width of 1 mm achieves a detection accuracy of better than 0.1 mm.
A thin film magnetic field sensor of sub-pT resolution and magnetocardiogram (MCG) measurement at room temperature Peer-reviewed

S. Yabukami, K. Kato, Y. Ohtomo, T. Ozawa, K. I. Arai

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　321　(7)　675-678　2009/04
Publisher: ELSEVIER SCIENCE BV
DOI： 10.1016/j.jmmm.2008.11.083 　

ISSN：0304-8853

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We developed a very sensitive high-frequency carrier-type thin film sensor with a sub-pT resolution using a transmission line. The sensor element consists of Cuconductor with a meander pattern (20mm in length, 0.8mm in width, and 18 mm in thickness), a ground plane, and amorphous CoNbZr film (4 mm in thickness). The amplitude modulation technique was employed to enhance the magnetic field resolution for measurement of the high-frequency field (499 kHz), a resolution of 7.10 x 10(-13) T/Hz(1/2) being achieved, when we applied an AC magnetic field at 499 kHz. The phase detection technique was applied for measurement of the low frequency field (around 1 Hz). A small phase change was detected using a dual mixer time difference method. A high phase change of 130 degrees/Oe was observed. A magnetic field resolution of 1.35 x 10(-12) T/Hz(1/2) was obtained when a small AC field at 1Hz was applied. We applied the sensor for magnetocardiogram (MCG) measurement using the phase detection technique. We succeeded in measuring the MCG signal including typical QRS and T waves, and compared the MCG with a simultaneously obtained conventional electrocardiogram (ECG) signal. (C) 2008 Elsevier B. V. All rights reserved.
Measurement of thin film permeability by direct contact and optimization Peer-reviewed

S. Yabukami

JOURNAL OF APPLIED PHYSICS　105　(7)　07E719-1-07E719-3　2009/04
Publisher: AMER INST PHYSICS
DOI： 10.1063/1.3074230 　

ISSN：0021-8979

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A highly sensitive method for obtaining the permeability of magnetic film without a limitation of sample size was developed based on the electrical impedance of magnetic film in contact with a copper conductor. The permeability of a CoNbZr thin film (25 x 25 mm(2), 4 mu m thick) was evaluated in the frequency range of 10 MHz-4 GHz, the measured values roughly corresponding to those obtained by the Landau-Lifshitz-Gilbert equation. The proposed method shows promise for permeability measurement of wafer-sized samples because the method is free of size limitation. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3074230]
A Measurement of Magnetocardiogram (MCG) by Planar Type Sensor using CoNbZr Film Peer-reviewed

OHTOMO Y., YABUKAMI S., KATO K., OZAWA T., ARAI K. I.

Transactions of the Magnetics Society of Japan　33　(3)　283-286　2009
Publisher: The Magnetics Society of Japan
DOI： 10.3379/msjmag.0903RF8022 　

ISSN：1882-2924

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We developed a very sensitive high-frequency carrier-type magnetic-field sensor with a sub-pT resolution using a transmission-line-type sensor. Meander-type sensor elements using amorphous CoNbZr films (4μm in thickness), Cu conductor with a meander pattern (30 mm in length, 1.0 mm in width, 18 μm in thickness), and a ground plane were fabricated. We obtained a magnetic field resolution of 9.1×10-13 T/Hz1/2 at 1 Hz. The detectable magnetic field was limited by the 1/f noise. We detected a magnetocardiogram (MCG) signal of heartbeats with the sensor.
Wireless magnetic motion capture system using multiple LC resonant magnetic markers with high accuracy Peer-reviewed

Shuichiro Hashi, Masaharu Toyoda, Shin Yabukami, Kazushi Ishiyama, Yasuo Okazaki, Ken Ichi Arai, Hiroyasu Kanetaka

SENSORS AND ACTUATORS A-PHYSICAL　142　(2)　520-527　2008/04
Publisher: ELSEVIER SCIENCE SA
DOI： 10.1016/j.sna.2007.09.011 　

ISSN：0924-4247

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The present paper reports the principle of a wireless magnetic motion capture system that uses multiple LC resonant magnetic markers and demonstrates its application. Small and lightweight markers (4 mm in diameter, 10 mm in length, and 0.63 g in weight) use a soft ferrite core and a coil, representing a minimal LC circuit with no battery, driven wirelessly by electromagnetic induction. The markers are given respective resonant frequencies ranging from 150 to 450 kHz. The magnetic signal of the marker is detected by a pick-up coil array consisting of 25 pick-up coils. The markers are excited by a superposed wave corresponding to all of the resonant frequencies, while the voltage signals induced through pick-up coils are separated in a frequency spectrum by FFT analysis. Regardless of the number of markers, the voltage amplitude for each resonant frequency can be easily obtained simultaneously, and thus the proposed system can detect multiple markers. In addition, the positional error of the system caused by a mutual inductance between the exciting coil and the LC marker was examined. The impedance change of the exciting coil due to a resonance of the LC marker was found to perturb the strength of the magnetic field used for marker excitation. The closer a marker approaches the exciting coil, the larger it becomes. This fluctuation induces an error in the marker signal, which is measured by the pick-up coils and is necessary for positional calculation. Then, considering the mutual inductance, a compensatory process was employed for positional calculation in order to improve the positional accuracy. After compensation, the absolute positional accuracy was determined to be less than 2 mm within 140 mm of the pick-up coil array. (C) 2007 Elsevier B.V. All rights reserved.
A Measurement of Magnetocardiogram (MCG) Using a High-Frequency Carrier-Type Thin-Film Field Sensor Peer-reviewed

YABUKAMI S., KATO K., KAMO Y., OZAWA T., ARAI K. I.

Transactions of the Magnetics Society of Japan　32　(4)　483-486　2008
Publisher: The Magnetics Society of Japan (MSJ)
DOI： 10.3379/msjmag.32.483 　

ISSN：1882-2924

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We developed a very sensitive high-frequency carrier-type magnetic field sensor with a pT resolution using a transmission-line-type sensor. Meander-type sensor elements using amorphous CoNbZr films were fabricated. We obtained a magnetic field resolution of 3.0 x 10-12 T/Hz1/2 at 1 Hz. The detectable magnetic field was limited by the 1/f noise. We detected the magnetocardiogram (MCG) signal by using the sensor.
High-frequency magnetic properties of ferrite particulate films Peer-reviewed

S. Hashi, S. Yabukami, A. Maeda, N. Takada, S. Yanase, Y. Okazaki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　316　(2)　465-467　2007/09
Publisher: ELSEVIER SCIENCE BV
DOI： 10.1016/j.jmmm.2007.03.172 　

ISSN：0304-8853

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Ni-Zn ferrite particulate films fabricated by two room-temperature colloidal processing methods are characterized through high-frequency magnetization measurements. The particles for the colloidal solution are synthesized by coprecipitatation, affording particles 5-20nm in size. The films prepared from the solution are shown to consist of 15-40 nm particles in a densely packed arrangement. The film prepared by electrophoretic deposition (EPD) is 12 mu m thick with a comparatively smooth surface. Measurements of the frequency dependence of complex permeability for the films reveal an external bias field dependence and high magnetic resonance frequency (1 GHz), despite the films being isotropic. (c) 2007 Elsevier B.V. All rights reserved.
Wireless magnetic motion capture system - Compensatory tracking of positional error caused by mutual inductance Peer-reviewed

Shuichiro Hashi, Masaharu Toyoda, Shin Yabukami, Kazushi Ishiyama, Yasuo Okazaki, Ken Ichi Arai

IEEE TRANSACTIONS ON MAGNETICS　43　(6)　2364-2366　2007/06
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/TMAG.2007.892874 　

ISSN：0018-9464

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A wireless magnetic motion capture system using an LC resonant magnetic marker was developed and has been studied. The positional error of the system caused by mutual inductance between the exciting coil and the LC marker was examined. It has been found that the impedance change of the exciting coil due to a resonance of the LC marker perturbs the strength of the magnetic field which is used for marker excitation. The more a marker approaches the exciting coil, the larger it becomes. This fluctuation induces an error in the marker signal which is measured by the pickup coils and is necessary for positional calculation. Then, the compensatory process in consideration of the mutual inductance has been employed for positional calculation in order to improve the positional accuracy. From the compensation, the absolute positional accuracy is less than 2 mm within 140 nun of the pickup coil array.
Development of magnetic motion capture system for multi-position detection Peer-reviewed

Shuichiro Hashi, Masaharu Toyoda, Shin Yabukami, Masashi Ohya, Kazushi Ishiyama, Yasuo Okazaki, Ken Ichi Arai

SENSOR LETTERS　5　(1)　300-303　2007/03
Publisher: AMER SCIENTIFIC PUBLISHERS
DOI： 10.1166/sl.2007.008 　

ISSN：1546-198X

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We developed and demonstrated a wireless multi-position detecting system using up to five LC resonant magnetic markers. The small size and light weight marker (4 mm in diameter, 10 mm long and 0.63-g in weight) uses a soft ferrite core with a coil, representing a minimal LC circuit with no battery, driven wirelessly by electromagnetic induction. The markers were given respective resonant frequencies range of 150 kHz to 450 kHz. The magnetic signal of the marker is detected by twenty-five matrix-designed search coils array. Generated flux density from the marker is considered as an ideal magnetic dipole field, the position and orientation of the marker is calculated using the nonlinear method of least squares, which effect an optimization using the Gauss-Newton method. According to the attitude angle of the markers, positional and orientational accuracies of the markers degrade as the markers distance from the search coils array increase due to decrease of S/N ratio. Cylinder axes of the markers are arranged with exciting field, however, the positional error of the markers was less than 2 mm within 100 mm and the maximum error was less than 5 mm at 150 mm of the search coils array. Approximately correct orientation of the markers was able to be acquired.
より豊かな生活に貢献する医療技術に関する研究生体内モーションキャプチャシステムを応用した非侵襲的な咀嚼・嚥下機能測定装置の開発

金高弘恭, 藪上信, 荒井賢一

医科学応用研究財団研究報告　24　45-48　2007/02
Publisher: (公財)鈴木謙三記念医科学応用研究財団
ISSN：0914-5117

eISSN：2185-2561

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複数の磁気マーカの使用が可能な新しい生体内モーションキャプチャシステムを応用し、ニーズが高い咀嚼・嚥下機能障害の診断に必要な仕様を目標とし、実用化を指向した試作機を作製した。具体的には、500μm以内の位置精度、剛体としての6自由度計測、高速な顎変位を計測するため80Hz以上の計測周期を目標に開発を行った。測定時の違和感が小さいことから、従来では測定困難であった自然な状態での高精度な咀嚼・嚥下機能評価が可能であった。さらに、口腔機能リアルタイム表示機能を活用することにより、リハビリテーションにも応用可能で、診断および治療を含めた総合的な口腔機能改善支援システムとなりうるとことが示唆された。
High-Frequency Carrier-Type Magnetic Field Sensor with a Sub-pT Resolution Using a Magnetic Film and a Transmission Line Peer-reviewed

Murayama Y., Ozawa T., Yabukami S., Ishiyama K., Arai K.I.

Journal of the Magnetics Society of Japan　31　(1)　17-22　2007
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.31.17 　

ISSN：0285-0192

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We developed a very sensitive high-frequency carrier-type magnetic field sensor with a sub-pT resolution using a resonating transmission line. Meander-type sensor elements using amorphous CoNbZr films were fabricated. We obtained a magnetic field resolution of 7.4 x 10-13 T/Hz1/2 at 501 kHz. The detectable magnetic field was limited bythe noise caused by nonlinear magnetic excitation. We analyzed the quality factor of the resonance for enhancementof the signal-to-noise ratio.
Development of a Fingertip Position-Sensing System using LC Resonated Markers Peer-reviewed

Yabukami S., Ogasawara K., Saitoh H., Hashi S., Toyoda M., Okazaki Y., Arai K.I.

Journal of the Magnetics Society of Japan　31　(6)　439-444　2007
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.31.439 　

ISSN：0285-0192

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We propose a new system for sensing the positions of up to five wireless magnetic markers using phase detection. It consists of five resonated markers, a driving coil, and pickup coils. Slim LC resonated markers were fabricated and a detector was formed by connecting high-speed AD converters. The system has a position accuracy of around 1 mm, and can be used for highly accurate position sensing without magnetic shielding, because it is free from earth field noise. We tracked fingertips using five resonated markers.
Wireless magnetic motion capture system for multi-marker detection Peer-reviewed

Shuichiro Hashi, Masaharu Toyoda, Shin Yabukami, Kazushi Ishiyama, Yasuo Okazaki, Ken Ichi Arai

IEEE TRANSACTIONS ON MAGNETICS　42　(10)　3279-3281　2006/10
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/TMAG.2006.880737 　

ISSN：0018-9464

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A wireless multi-motion capture system using five LC resonant magnetic markers has been developed and is demonstrated. Each marker has an individual resonant frequency, 157, 201, 273, 323, and 440 kHz, respectively. A new measuring technique is applied in order to reduce the acquisition time. In this new technique the markers are excited by a superposed wave corresponding to the all resonant frequencies while the voltage signals induced through pick-up coils are separated in a frequency spectrum by FFT analysis. Regardless of the number of markers, the voltage amplitude for each resonant frequency can be easily obtained simultaneously and thus the proposed system can detect multiple markers. The positional accuracy for five markers is less than 2 mm within 100 mm of the pick-up coil array.
上下に磁界センサを分離した測定システムによる6自由度顎運動測定

金高弘恭, 薮上信, 冨塚亮, 三谷英夫, 荒井賢一

日本顎関節学会雑誌　18　(1)　76-76　2006/04
Publisher: (一社)日本顎関節学会
ISSN：0915-3004

eISSN：1884-4308
Magnetic motion capture system using LC resonant magnetic marker composed of Ni-Zn ferrite core Peer-reviewed

S. Hashi, S. Yabukami, M. Toyoda, M. Ohya, K. Ishiyama, Y. Okazaki, K. I. Arai

JOURNAL OF APPLIED PHYSICS　99　(8)　08B312　2006/04
Chaotic noise increase in high-frequency carrier-type thin-film sensor Peer-reviewed

S. Yabukami, Y. Murayama, K. Ishiyama, K. Arai, H. Okuno

INTERMAG 2006 - IEEE International Magnetics Conference　689　2006

DOI： 10.1109/INTMAG.2006.376413 　
Development of wireless magnetic motion capture system for multi-marker detection Peer-reviewed

S. Hashi, M. Toyoda, S. Yabukami, K. Ishiyama, Y. Okazaki, K. Arai

INTERMAG 2006 - IEEE International Magnetics Conference　524　2006

DOI： 10.1109/INTMAG.2006.376248 　
Highly accurate position sensing system for a slim LC resonated marker using phase information Peer-reviewed

S. Yabukami, T. Kato, S. Hashi, K. Ishiyama, K. Arai, Y. Okazaki

INTERMAG 2006 - IEEE International Magnetics Conference　527　2006

DOI： 10.1109/INTMAG.2006.376251 　
Development of a Position-Sensing System for an LC resonating Slim Marker Using Phase Detection Peer-reviewed

Yabukami S., Katoh T., Hashi S., Arai K. I., Okazaki Y.

Journal of the Magnetics Society of Japan　30　(2)　218-224　2006
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.30.218 　

ISSN：0285-0192

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We propose a new system for sensing the position of a wireless magnetic marker using phase detection. It consists of a resonating wireless magnetic marker, a driving coil, and pickup coils. A slim LC resonating marker (1.2 mm in diameter and 10 mm long) was fabricated and a deteactor was formed by connecting high-speed AD converters. The system has a position accuracy of around 1 mm, and it can be used for highly accurate position sensing without magnetic shielding, because it is free from earth field noise.
Improvement of the Sensitivity of a High-Frequency Carrier-Type Magnetic Field Sensor Through the Use of an Edge Extension Structure Peer-reviewed

Sendoh M., Nakai T., Tachibana N., Hoshi N., Suzuki H., Horikoshi N., Yabukami S., Ishiyama K., Arai K. I.

Journal of the Magnetics Society of Japan　30　(2)　225-228　2006
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.30.225 　

ISSN：0285-0192

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Improvement of the sensitivity of a high-frequency carrier-type (HFC-type) magnetic field sensor through the use of an edge extension structure is reported. The HFC-type magnetic field sensor is composed of a rectangular CoNbZr thin film with a coplanar-structure Cu thin film as an electrode. The edge extension structure causes reduction of the sensor's demagnetization field effect. A variation in the sensor impedance was obtained as a function of the external magnetic field for edge extension lengths ranging from X= 0 mm to X = 1 mm. The length of the sensor was 1 mm, the thickness was 2 μm, and the widths were 20 and 80 μm. It was demonstrated that the gain of an HFC-type magnetic sensor with an edge extension length of X = 1 mm was three times higher than that of a sensor with an edge extension length of X= 0 mm. This result shows that an edge extension structure improves the sensitivity of an HFC-type magnetic field sensor.
Enhancement of High-Frequency-Carrier Type Magnetic Field Sensors by Controlling the Annealing Temperature Peer-reviewed

Murayama Y., Ozawa T., Horikoshi N., Yabukami S., Ishiyama K., Arai K. I.

Journal of the Magnetics Society of Japan　30　(2)　237-242　2006
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.30.237 　

ISSN：0285-0192

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We designed high-frequency-carrier type thin-film sensors to obtain high impedance change by controlling the annealing temperature, and investigated the relationships between the noise level, magnetic permeability, and domain structure. Meander-type sensor elements were fabricated, and a magnetic field resolution of 3.4 x 10-8 Oe/Hz1/2 at 501 kHz was obtained.
Development of Wireless Magnetic Multi-position Detecting System Using FFT Analysis Peer-reviewed

Toyoda M., Hashi S., Yabukami S., Ohya M., Ishiyama K., Okazaki Y., Arai K. I.

Journal of the Magnetics Society of Japan　30　(3)　391-395　2006
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.30.391 　

ISSN：0285-0192

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A wireless multi-position detecting system using three LC resonant magnetic markers was developed and demonstrated. The markers were given individual resonant frequencies of 183 kHz, 487 kHz, and 730 kHz, respectively. The new measuring technique described in this paper was applied to the system in order to reduce the acquisition time: the markers were excited by a superposed wave corresponding to the resonant frequencies, while the voltage signals induced through the pickup coils are separated into each frequency spectrum by FFT analysis. Regardless of the number of markers, the necessary voltage amplitude of each frequency spectrum can be obtained easily at the same time. Thus, our proposed system can detect multiple markers at a time. All the positional accuracies of the three markers are less than 5 mm within 100 mm of the pickup coil array.
High-Sensitivity AC Magnetic Field Measurement Based on the Reflection Signal of a High-Frequency Carrier-Type Magnetic Field Sensor Peer-reviewed

NAKAI T., SENDOH M., YABUKAMI S., ISHIYAMA K., ARAI K. I.

Journal of the Magnetics Society of Japan　30　(6)　550-554　2006
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.30.550 　

ISSN：0285-0192

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The high-frequency carrier-type (HFC-type) magnetic field sensor realizes very high sensitivity without any cooling apparatus for the sensor element. An important technique for obtaining high sensitivity is the use of a high-frequency current applied to the sensor element. The maximum sensitivity is obtained at frequencies up to the ferromagnetic resonance of the sensor magnetic thin film; for example, hundreds of megahertz for amorphous CoNbZr films. It is becoming important to study high-frequency circuits for driving HFC-type magnetic field sensors in order to achieve any practical applications such as nondestructive testing or biomedical applications. In this paper, a method of reflection signal measurement is studied in order to measure alternating magnetic fields with very small magnitude. A theoretical formula based on an equivalent circuit model was obtained for the relation between the sensor property and measurement sensitivity. An experimental confirmation was carried out by comparing this formula with experimental results. Finally, the measurement of a small alternating magnetic fields was effected by combining reflection signal measurement with the carrier-suppressing method.
Development of real-time and highly accurate wireless motion capture system utilizing soft magnetic core Peer-reviewed

S Hashi, Y Tokunaga, S Yabukami, M Toyoda, K Ishiyama, Y Okazaki, KI Arai

IEEE TRANSACTIONS ON MAGNETICS　41　(10)　4191-4193　2005/10
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/TMAG.2005.854839 　

ISSN：0018-9464

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Highly accurate wireless motion capture system using LC resonant magnetic marker, has been developed. The marker consists of soft magnetic core with wound coil and a chip capacitor without battery or electric wires, driven wirelessly by the action of electromagnetic induction. The system realized the position accuracy is less than 1 mm within the space of 150 mm from the pickup coil array. Compared with dc magnetic system, the proposed system is applicable for precision motion-capturing under optically isolated space without magnetic shielding because the system is not influenced very much by the earth field noise.
複数磁気マーカを利用した6自由度顎運動測定装置の開発

金高弘恭, 薮上信, 荒井賢一

日本顎関節学会雑誌　17　(1)　91-91　2005/04
Publisher: (一社)日本顎関節学会
ISSN：0915-3004

eISSN：1884-4308
A design of highly sensitive GMI sensor Peer-reviewed

S Yabukami, H Mawatari, N Horikoshi, Y Murayama, T Ozawa, K Ishiyama, KI Arai

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　290　1318-1321　2005/04
Publisher: ELSEVIER SCIENCE BV
DOI： 10.1016/j.jmmm.2004.11.427 　

ISSN：0304-8853

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Employing amplitude-modulation technique, we have optimized the giant magnetoimpedance (GMT) sensor. Our approach was to optimize the sensor structure so as to obtain a high signal-to-noise ratio by using finite element analysis. The optimum size of sensor strip is as follows: a thickness of 4.3 μ m, a strip width of 20-30 μ m, a length of several mm. The meander sensor element [CoNbZr (thickness, 4.3 μ m; length, 5 mm; width, 30 μ m; number of turns, 3) was fabricated using the lift-off process. A high impedance change over 200% was obtained at several hundred MHz. When a small AC magnetic field was applied to the sensor element, a very small AM signal was detected by the sensor system in a magnetically shielded room. A resolution of 1.7 x 10(-8) Oe/Hz(1/2) was obtained at 501 kHz. &COPY; 2004 Elsevier B.V. All rights reserved.
Wireless motion capture system using magnetically coupled LC resonant marker Peer-reviewed

S Hashi, Y Tokunaga, S Yabukami, T Kohno, T Ozawa, Y Okazaki, K Ishiyama, KT Arai

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　290　1330-1333　2005/04
Publisher: ELSEVIER SCIENCE BV
DOI： 10.1016/j.jmmm.2004.11.430 　

ISSN：0304-8853

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A novel motion capture system using magnetically coupled LC resonant marker have been developed. This system composed from the LC marker, a driving coil and a pickup coil array. The marker consists only of an inductor and a capacitor without battery or electric wires, and driven wirelessly by the action of electromagnetic induction. The position accuracy was around 2 mm when the marker was located within the space of 50 mm apart from the pickup coil array. The system is applicable for highly accurate motion capturing without magnetic shielding because the system is free from the earth field. Additionally, it has a possibility of a multi-point motion capturing because the system allow markers to have an individual frequency band. &COPY; 2004 Elsevier B.V. All rights reserved.
Impedance property of thin film GMI sensor with controlled inclined angle of stripe magnetic domain Peer-reviewed

T Nakai, H Abe, S Yabukami, KI Arai

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　290　1355-1358　2005/04
Publisher: ELSEVIER SCIENCE BV
DOI： 10.1016/j.jmmm.2004.11.436 　

ISSN：0304-8853

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The giant magnetoimpedance (GMI) effect of controlled-inch nation magnetic stripe domain for a thin-film GMI sensor is investigated. The inclined stripe domain structure has an inclined angle of domain walls against the transverse direction of the rectangular-strip element. It is obtained that GMI profile changes from a profile with a dip point at the zero magnetic field to a profile with one maximum impedance only at the zero field at an angle of 70&DEG;. In the case of GMI profile with a dip point, increasing the inclination angle decreases the bias field. This reduction of the bias field more than triples the sensor gain. An excellent linear property extending for wide range is obtained. A steplike impedance change property is also realized by this method. &COPY; 2004 Elsevier B.V. All rights reserved.
Design of a High-Frequency-Carrier-Type Thin-Film Magnetic Field Sensor Peer-reviewed

HORIKOSHI N., YABUKAMI S., MURAYAMA Y., OZAWA T., ISHIYAMA K., ARAI K. I.

Journal of the Magnetics Society of Japan　29　(4)　472-476　2005
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.29.472 　

ISSN：0285-0192

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We designed high-frequency-carrier-type thin-film sensors to obtain high sensitivity. We consider the relation between the sensor form and the sensor to be characteristic. When the sensor area was fixed to 5 mm × 5 mm, and the sensor interval was 30 μm, the width of the sensor with the best sensitivity was set to 200-400 μm. We fabricated a meander-type sensor element, and compared the calculated and measured result. It was found that-they mostly in agreed.
Development of a Position-Sensing System for a Wireless Magnetic Marker Using a Differential Pickup Coil Peer-reviewed

YABUKAMI S., HASHI S., OZAWA T., ABE T., KOHNO T., ARAI K. I., OKAZAKI Y.

Journal of the Magnetics Society of Japan　29　(2)　146-152　2005
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.29.146 　

ISSN：0285-0192

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We propose a new system for sensing the position of a wireless magnetic marker. It consists of a resonating wireless magnetic marker, a driving coil, and differential pickup coils. The differential pickup coils can save the dynamic range about 1/80 that of conventional pickup coils. The marker does not have a battery or electric wires. The system has an accuracy of around 3 mm, and it can be used for highly accurate position sensing without magnetic shielding, because it is free from earth field noise.
Precision Position-Detecting System Using an LC Resonant Magnetic Marker Peer-reviewed

TOKUNAGA Y., HASHI S., YABUKAMI S., KOHNO T., TOYODA M., OZAWA T., OKAZAKI Y., ARAI K. I.

Journal of the Magnetics Society of Japan　29　(2)　153-156　2005
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.29.153 　

ISSN：0285-0192

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A precision position-detecting system using a wireless LC resonant magnetic marker was developed. The marker consists of an inductor and a capacitor without battery or electric wires, driven wirelessly by electromagnetic induction. The positional accuracy is less than 1 mm within 150 mm of the pickup coil array. The optimal design made it possible to improve the positional accuracy of the system. The system can be used for highly accurate motion-capturing without magnetic shielding because it is free from the earth's field. In addition, it has the potential to capture multi-point motion because it allows the markers to have individual frequency bands.
Development of an Enhanced-Phase-Detection-Type Magnetic Field Sensor using a High-Frequency-Carrier Peer-reviewed

Ozawa T., Yokota C., Horikoshi N., Yabukami S., Ishiyama K., Arai K. I.

Journal of the Magnetics Society of Japan　29　(6)　663-666　2005
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.29.663 　

ISSN：0285-0192

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The impedance of a magnetic thin film changes when a magnetic field is applied. The high-frequency-carrier magnetic field sensor, also called a GMI sensor, employs this phenomenon as its principle. We directed our attention to the change in the phase characteristic, and measured the magnetic field by measuring the phase of the high-frequency-carrier magnetic field sensor as a phase difference. Although the high-frequency-carrier magnetic field sensor is optimized for impedance detection, it is not appropriate for measuring the magnetic field by detecting the phase difference. To improve its resolution and sensitivity in this respect, we developed an enhanced-phase-difference-detection-type magnetic field sensor. As a result, we obtained a best rate of change of 63.5 degree/Oe and a resolution of 2.6 × 10-7 Oe/Hz1/2.
Development of an AC Magnetic Field Measurement System Using Phase Difference Detection of a High-Frequency-Carrier Magnetic Field Sensor Peer-reviewed

Ozawa T., Mawatari H., Yabukami S., Ishiyama K., Arai K. I.

Journal of the Magnetics Society of Japan　29　(8)　831-837　2005
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.29.831 　

ISSN：0285-0192

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The impedance and phase characteristic of a magnetic thin film changes when a magnetic field is applied. The high-frequency-carrier magnetic field sensor, also called a GMI sensor, employs this phenomenon as its principle. We directed our attention to the change in the phase characteristic, and measured the dc magnetic field by measuring the phase as a phase difference, using the dual-mixer time-difference method. We optimized the method and the continuous sampling condition to measure the phase difference, and developed an efficient system for measuring the continuous sampling phase difference with low noise. The system was successfully used to measure the ac magnetic field by continuous sampling of the phase difference of a high-frequency-carrier magnetic field sensor.
磁気式モーションキャプチャシステムを応用した口腔機能改善支援システムの構築

金高弘恭, 薮上信, 荒井賢一, 五十嵐薫

日本摂食・嚥下リハビリテーション学会雑誌　8　(2)　225-225　2004/12
Publisher: (一社)日本摂食嚥下リハビリテーション学会
ISSN：1343-8441

eISSN：2434-2254
磁気式モーションキャプチャシステムを応用した6自由度顎運動測定装置の開発

金高弘恭, 薮上信, 荒井賢一, 三谷英夫

日本矯正歯科学会大会プログラム・抄録集　63回　316-316　2004/11
Publisher: (公社)日本矯正歯科学会
High-frequency carrier type thin-film sensor using low-noise crystal oscillator Peer-reviewed

S Yabukami, H Mawatari, Y Murayama, T Ozawa, K Ishiyama, KI Arai

IEEE TRANSACTIONS ON MAGNETICS　40　(4)　2670-2672　2004/07
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/TMAG.2004.828960 　

ISSN：0018-9464

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We have developed a very sensitive high-frequency carrier-type magnetic field sensor based on the giant magneto-impedance effect available at lower frequencies. Our approach is to optimize the sensor structure so as to obtain high impedance. In addition, we optimize the carrier suppressing circuit using a low-noise crystal oscillator to reduce the phase noise of the lower offset frequency (under 1 kHz) as a carrier source. When a small ac magnetic field is applied to the sensor element, a very small AM signal can be detected using a carrier suppressing circuit with a low-noise crystal oscillator. A resolution of 1.7 x 10(-8) Oe/Hz(1/2) was obtained at 501 kHz. The detectable magnetic field is limited by the thermal noise of room temperature. Resolutions of 1.5 x 10(-7) Oe/Hz(1/2) at 1 kHz and a resolution of 1.1 x 10(-6) Oe/Hz(1/2) at 110 Hz were demonstrated. The resolution was basically limited by the phase noise of the crystal oscillator.
Soft magnetic applications in the RF range Peer-reviewed

M Yamaguchi, Y Miyazawa, K Kaminishi, H Kikuchi, S Yabukami, KI Arai, T Suzuki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　268　(1-2)　170-177　2004/01
Publisher: ELSEVIER SCIENCE BV
DOI： 10.1016/S0304-8853(03)00495-5 　

ISSN：0304-8853

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Soft magnetic thin-film applications in the RF range are systematically described based on the complex permeability profile of the films. This work demonstrates the metallic thin-film permeability measurements up to 6 GHz under the existence of traveling electric field, two types of ferromagnetic RF integrated inductor with the best properties of L = 7.9 nH and Q = 12.7 at 2 GHz for a 200 x 400 mum size four-turn rectangular spiral, and a high frequency carrier type thin-film magnetic field sensor (or so-called GMI sensor) with the AC field sensitivity of 4.8 x 10(-6) A m(-1)/rootHz(6 x 10(-12) T/rootHz). (C) 2003 Elsevier B.V. All rights reserved.
Variation of the Magnetic Domain and GMI Property of a HFC-Type Magnetic Field Sensor with Inclined Domain Walls Resulting from the Application of an External Magnetic Field in the Measurement Direction Peer-reviewed

Nakai T., Yabukami S., Arai K.I.

Journal of the Magnetics Society of Japan　28　(2)　128-131　2004
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.28.128 　

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A change in the magnetic domain structure of a high- frequency carrier-type (HFC-type) thin-film magnetic field sensor (or giant magnetoimpedance, GMI, sensor) with inclined ladder-line magnetic domain walls was investigated as a function of an external magnetic field. The GMI property of the same sensor element was also investigated. Comparison of these data leads to the following results: The application of an external magnetic field causes a drastic change in the domain structure, from an inclined ladder-line to a single domain on a threshold magnetic field. The threshold field is different for increasing and decreasing magnetic fields. This hysteretic phenomenon is in accord with the hysteresis of the GMI property. It was investigated theoretically by using the bias susceptibility model of a single-domain magnetic thin-film with uniaxial anisotropy. This theoretical model predicts that contiguous inclined ladder-line domains on a 180° wall will have different values for the high-frequency permeability. An approximate estimate of the total sensor impedance obtained by adding the impedances of all the ladder-line domains shows that the hysteresis of the domain leads to the hysteresis of the GMI property. It also explains why inclined ladder-line HFC-type sensors have high sensor gain.
Magnetic Jaw-Tracking System Available with Six Degrees of Freedom

薮上信, 荒井薫, 金高弘恭, 辻真哉, 荒井賢一

J.Mag.Soc.Japan　28　(5)　711-717　2004
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.28.711 　

ISSN：0285-0192 1880-4004

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We developed a jaw-tracking system consisting of two magnets and biaxial fluxgate sensors. One magnet is fastened to a tooth in the bottom jaw of the subject and another is fastened to the subject's forehead. The system can naturally detect movement of the jaw as a rigid body. We fabricated sensor arrays with separate upper and lower parts in order to obtain good position accuracy. Positional accuracy to within 0.1 mm was achieved as a rigid body using a jaw model. Six degrees of freedom and 100 Hz sensing cycles were achieved using one rigid marker (composed of two magnets), and achieved position accuracy to within 0.3 mm.
Estimation of High-Frequency Carrier Thin Film Magnetic Sensor that Measures Phase Difference

Ozawa T., Mawatari H., Murayama Y., Yabukami S., Arai K. I., Hanado Y., Imae M.

Journal of the Magnetics Society of Japan　28　(5)　718-721　2004
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.28.718 　

ISSN：0285-0192 1880-4004

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The impedance of a magnetic thin film changes when a magnetic field is applied. The high-frequency carrier magnetic field sensor, also called a GMI sensor, employs this phenomenon as its principle; it acts as previously a high-sensitivity magnetic field sensor. We detected the impedance by an amplitude-modulation method. As changing the impedance also changes a phase difference, we directed our attention to this phenomenon and measured the magnetic field by measuring the phase difference. The sensor element used was a meander pattern (thickness: 4.1 μm, length: 1mm, width: 20 μm, unit distance: 50 μm, number of turns: 3), which was fabricated on a CoNbZr thin film by a lift-off process. The high frequency of the carrier signal made it difficult to measure the phase difference correctly. We coverted the carrier frequency to a low frequency by the dual-mixer time-difference method and calculated the phase difference by measuring interval time. The best rate of change is 5.24 degrees/Oe at 7.8 Oe when the carrier frequency is 158 MHz. As the jitter error of this system is 5.51×10-4 degree and the sampling rate is 1 ksample/sec, the resolution of this system is 3.32 × 10-6 Oe/√Hz.
Development of a Position-Sensing System for a Wireless Magnetic Marker

薮上信, 枦修一郎, 徳永裕樹, 河野丈志, 荒井賢一, 岡崎靖雄

J.Mag.Soc.Japan　28　(7)　877-885　2004
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.28.877 　

ISSN：0285-0192 1880-4004

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We propose a new system for sensing the position of wireless magnetic marker. It consists of a resonating wireless magnetic marker, driving coils, and pickup coils. The marker does not have a battery or electric wires. The system has an accuracy of around 2 mm, and it can be used for highly accurate position sensing without magnetic shielding, because it is free from earth field noise.
Phase detection of high-frequency carrier-type thin-film sensor

S Yabukami, H Mawatari, O Shimoe, KI Arai

IEEE TRANSACTIONS ON MAGNETICS　39　(5)　3196-3198　2003/09
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/TMAG.2003.816056 　

ISSN：0018-9464

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We propose, herein, a method by which to measure the phase of the carrier in a high-frequency carrier-type sensor (giant magneto impedance sensor). The proposed method is based on a carrier suppression technique. The phase of the carrier signal changed dramatically by approximately 180degrees around the carrier suppression when a small dc field was applied. The phase sensitivity for a small dc field reached 3600degrees/Oe. In addition, in the present study, we investigate the relationship between phase sensitivity and suppressed carrier level in the suppression circuit, the measured data nearly corresponded to theoretical data.
Electrical resistivity and GHz permeability of (CoFeB)-(SiO1.9) hetero-amorphous granular films Peer-reviewed

M. Munakata, M. Namikawa, M. Motoyama, M. Yagi, Y. Shimada, S. Yabukami, M. Yamaguchi, K. I. Arai

Intermag 2003 - Program of the 2003 IEEE International Magnetics Conference　2003
Publisher: Institute of Electrical and Electronics Engineers Inc.
DOI： 10.1109/INTMAG.2003.1230314 　

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In this paper, we present experimental evidences about the very large critical thickness of our films that makes eddy current loss practically negligible in GHz range.
GH_Z Permeability of Soft Magnetic Co-Fe-B Films with High Anisotropy Fields Peer-reviewed

NAMIKAWA M., MUNAKATA M., YAGI M., MOTOYAMA M., SHIMADA Y., YABUKAMI S., YAMAGUCHI M., ARAI K. I.

Journal of the Magnetics Society of Japan　27　(4)　371-374　2003
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.27.371 　

ISSN：0285-0192

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Co-Fe-B films with a thickness of 0.5μm were fabricated by synchronous dual RF magnetron sputtering a while rotating cylindrical electrode. A magnetic thin-film core for GHz applications was obtained with a large anisotropy field Hk and large saturation magnetization 4πMs, and these permeability characteristics and micro-structures investigated. The as-deposited film, with Hk of 390 Oe were and 4πMs of 17.6 kG, exhibited high ferromagnetic resonance (FMR) frequencies of up to 6 GHz in permeability characteristics. The film has an amorphous-like structure including atomic ordering within the range of several angstroms, which leads to good soft magnetic properties with an electrical resistivity of 100μ Ω cm. The large Hk of the films fabricated by the sputtering method is effective for attaining higher frequency characteristics with lower FMR loss.
High-Frequency-Carrier Type Thin Film Magnetic Field Sensor for AC Detection

MAWATARI H., KIKUCHI H., YABUKAMI S., YAMAGUCHI M., ARAI K. I.

Journal of the Magnetics Society of Japan　27　(4)　414-418　2003
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.27.414 　

ISSN：0285-0192 1880-4004

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We designed high-frequency-carrier type thin film sensors to obtain high impedance change. We considered the relationships between carrier current density and noise level, carrier current density and sideband level, and optimum impedance of sensor element. The meander type sensor element fabricated had an impedance change of 30 Ω/Oe at 500 MHz. Sensitivity of 4.5×10-8 Oe was demonstrated at 501 kHz using a carrier-suppression technique.
Characterization by Microwave Probe of HFC-Type Magnetic Field Sensor with Coplanar Electrode Peer-reviewed

NAKAI T., ABE H., YAMAGUCHI M., YABUKAMI S., KIKUCHI H., ARAI K. I.

Journal of the Magnetics Society of Japan　27　(4)　419-424　2003
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.27.419 　

ISSN：0285-0192

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Special equipment and measurement circuit structures are needed to characterize the magnetoimpedance effect up to 1 GHz for a high-frequency-carrier type (HFC- type) magnetic field sensor, called a GMI (Giant MagnetoImpedance) sensor. The reason is that accurate measurement of impedance above 100 MHz needs consideration of characteristic impedance throughout the measurement circuit. In this study, a microwave probe of 150 μm distance ground-signal-ground type was used to measure the S11 response of the sensor. For structural conformity with the probe, a coplanar electrode was proposed for the sensor element. The coplanar electrode facilitates construction by a thin film process. This measurement system has excellent repeatability of measurement with short preparation speed. On the other hand, the coplanar electrode of the sensor element has unnecessary electric properties, especially in the high frequency caused by its structure. For example, there are structural inductance and capacitance. We studied the electrical properties of the sensor that are caused by coplanar structure, using computer simulation, and clarified the extent of the unnecessary impedance. Theoretical considerations for estimating the structural effect of impedance were also carried out. It was shown that a simple transmission line equation is in good agreement with the measurement.
High-Frequency-Carrier Type Thin Film Magnetic Field Sensor Using Phase Detection

YABUKAMI S., MAWATARI H., SHIMOE O., KIKUCHI H., ARAI K. I.

Journal of the Magnetics Society of Japan　27　(4)　425-428　2003
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.27.425 　

ISSN：0285-0192 1880-4004

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We applied a high-frequency-carrier type thin film sensor with carrier-suppressing circuit using a phase detection circuit fabricated as a printed circuit board. Phase of the carrier signal was dramatically changed by about 180 degrees during carrier suppression. We achieved phase sensitivity of 18 deg/mOe in a dc field.
Error Analysis of a Jaw-Tracking System Using Two Magnets

Yabukami S., Arai K., Kanetaka H., Tsuji S., Arai K. I., Mitani H.

Journal of the Magnetics Society of Japan　27　(6)　765-770　2003
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.27.765 　

ISSN：0285-0192 1880-4004

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We developed a new system to capture jaw movement. It consists of two magnets and biaxial fluxgate sensors. A magnet is fixed to a tooth in the bottom jaw of the subject and another is fixed to the subject's forehead. The system can naturally detect movement of the jaw as a rigid body, because it does not require such attachments as a clutch inside the mouth or a magnetic field sensor array in contact with the head. In this paper, we investigate five error sources of the jaw-tracking system, using a jaw model, and report the achievement of a positional accuracy of 1.5 mm and an axial accuracy of 2 degrees. Positional accuracy within 2 mm is achieved as a rigid body.
Impedance Profile of a HFC-Type Magnetic Field Sensor with Inclined Magnetic Domain Walls, and Method of Controlling the Domain Wall Angle Peer-reviewed

Nakai T., Abe H., Yabukami S., Yamaguchi M., Arai K.I.

Journal of the Magnetics Society of Japan　27　(7)　832-838　2003
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.27.832 　

ISSN：0285-0192

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Reduction of the bias field of a high-frequency carrier-type (HFC-type) thin-film magnetic field sensor (or giant magnetoimpedance, GMI, sensor) was investigated on the basis of a new technique for realizing inclined ladder-line magnetic domain walls against the transverse direction of a sensor strip. A new idea for controlling the angle of a magnetic domain wall is to apply a magnetic field in a direction slightly inclined from the transverse direction of the sensor strip during magnetic field annealing, where the parameters are the aspect ratio of the sensor cross-section and the direction and strength of the annealing magnetic field. This method is effective for a small thin-film HFC-type sensor with a width of less than 50 μm and an aspect ratio of the sensor cross-section of less than 15. Increasing the angle between the domain wall and the transverse direction decreases the bias field. This reduction of the bias field more than triples the sensor gain in a frequency range up to 600 MHz. The above experimental results qualitatively agree with a calculation based on the bias susceptibility model of a single-domain magnetic thin film with uniaxial anisotropy.
Highly sensitive permeability measurements obtained by electrical impedance

S. Yabukami, R. Ojima, M. Yamaguchi, K. I. Arai, S. Kikuchi

Journal of Magnetism and Magnetic Materials　254-255　111-114　2003/01

DOI： 10.1016/S0304-8853(02)00799-0 　

ISSN：0304-8853

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We propose a highly sensitive method of obtaining permeability. Permeability was obtained from electrical impedance of strips by using wafer probe. The permeability of a CoNbZr strip was evaluated as a function of magnetic field intensity. Measured values approached those of the Landai-Lifshitz-Gilbert (LLG) theory with decreasing field intensity. The proposed method is better than the conventional shielded loop coil method when measuring permeability in a small area. © 2002 Elsevier Science B.V. All rights reserved.
Evaluation of High Frequency Properties of RW-Wires Used for HDD Heads

YAMAGUCHI Masahiro, TESHIROGI Chikao, YOSHIDA Kazuya, KURIBARA Takashi, YABUKAMI Shin, KIKUCHI Shinki, ARAI Ken-Ichi

ITE Technical Report　26　(64)　5-8　2002/10/03
Publisher: The Institute of Image Information and Television Engineers
DOI： 10.11485/itetr.26.64.0_5 　

ISSN：1342-6893

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Beginning from the study of reproducibility of electric contact between the wafer probe and the RW wire, equivalent circuit parameters of RW-wires were extracted as ; Low frequency inductance of a pair of W- or R- wire was 30nH, which means each wire has inductance of 15nH or less. Low frequency resistance was 5Ω, showing the resistance of each wire as 2.5Ω. Stray capacitance were 2-3 pF at low frequencies. Resonance frequency was 2GHz. Cross-talk model is also discussed.
A new tracking system of jaw movement using two magnets

S Yabukami, H Kanetaki, N Tsuji, A Itagaki, M Yamaguchi, KI Arai, H Mitani

IEEE TRANSACTIONS ON MAGNETICS　38　(5)　3315-3317　2002/09
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/TMAG.2002.802301 　

ISSN：0018-9464

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We have developed a new tracking system of jaw movement. The system consists of two permanent NdFeB magnets and 32 elements of two-axial fluxgate sensor array. The two magnets are attached to head portion and front tooth. This system does not need any attachments of the head portion or mouth such as clutch or magnetic field sensor except magnets. The proposed system is applicable for five degrees of freedom. Position accuracy within 2 mm was achieved.
Permeability in PLD-made Mn-Zn ferrite thin films by low-temperature process

M Nakano, M Akase, H Fukunaga, Y Matsuo, S Yabukami, M Yamaguchi, KI Arai

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　242　(245)　157-159　2002/04
Publisher: ELSEVIER SCIENCE BV
DOI： 10.1016/S0304-8853(01)01186-6 　

ISSN：0304-8853

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Although a soft ferrite thin film with high resistivity is to be applied to GHz magnetic devices, a fabrication process with high temperature annealing prevents us from applying to those devices. This contribution reports that soft ferrite films with the permeability of approximate to 10 at the frequency of I GHz can be obtained by PLD method using low-temperature process. (C) 2002 Elsevier Science B.V. All rights reserved.
Improvement of sensitivity using carrier suppression technique in high frequency carrier type thin-film magnetic field sensor Peer-reviewed

Kikuchi H, Yabukami S, Yamaguchi M, Arai K.-I, Suzuki T

Digests of the Intermag Conference　2002
Production of Small Magnetic ac marker

S. Sato, K. Suzuki, H. Kikuchi, A. Yamazaki, N. Ajiro, S. Yabukami, M. Yamaguchi, K. I. Arai, S. Kikuchi

J.Mag.Soc.Jpn　26　(5)　769-774　2002
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.26.769 　

ISSN：0285-0192 1880-4004

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We designed and fabricated cylindrical magnetic ac markers for magnetic motion capture system. The ac marker is 12 mm long and 7 mm in diameter. The inductance of the coil was calculated using Dwight's formula. A magnetic field of 2.4 × 10-7 Oe was measured using a high-frequency carrier type thin-film magnetic field sensor combined with a carrier-suppressing circuit. The distance detected between sensors and marker was 1250 mm.
Highly Sensitive Detection of AC Magnetic Field Using High-frequency Carrier Type Thin-film Magnetic Field Sensor with Carrier-suppressing Circuit

菊池弘昭, 薮上信, 山口正洋, 荒井賢一, 鈴木哲

J.Mag.Soc.Jpn　26　(4)　562-565　2002
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.26.562 　

ISSN：0285-0192 1880-4004

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A high-frequency carrier type thin-film magnetic field sensor was combined with a high-frequency carrier suppressing circuit to increase detection sensitivity. The carrier-suppressing circuit was designed and tuned to suppress the carrier, thus reducing the phase noise level of thermal noise (-174 dBm) at room temperature. The carrier was suppressed by about 60 dB, enabling detection of a very low signal from the sensor. As a result, high sensitivity of 7.2 × 10-6A/m (9 × 10-8 Oe) was demonstrated at 501 kHz.
Capturing Jaw Movement Using Two-Magnet System

S. Yabukami, H. Kanetaka, N. Tsuji, A. Itagaki, M. Yamaguchi, K. I. Arai, H. Mitani

J.Mag.Soc.Jpn　26　(4)　616-620　2002
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.26.616 　

ISSN：0285-0192 1880-4004

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We developed a new motion-capture system for jaw movement using two magnets and two-axial fluxgate sensors. Two magnets are fixed to a tooth in the lower jaw and to the forehead. The system can naturally detect the jaw movement as a rigid body because the system has no need for attachments such as a clutch inside the mouth or a magnetic field sensor array in contact with the head.
複数磁気マーカを用いたモーションキャプチャシステムによる新型顎運動測定装置の開発 Peer-reviewed

金高弘恭, 薮上信, 河内満彦, 荒井賢一, 三谷英夫

Orthod Waves　61　(2)　110-117　2002
Publisher: (公社)日本矯正歯科学会
ISSN：1344-0241

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新開発された複数磁気マーカに対するモーションキャプチャシステムを応用し,下顎全体の立体としての運動を測定できる装置を開発した.従来の磁気式測定装置では1個の磁気マーカの運動しか測定できなかったが,本装置では,複数の磁気マーカに対しての同時測定が可能となるため,下顎を立体として認識した上での下顎全体の立体運動が測定可能となった.更に小型の磁気マーカを利用するため測定時の違和感が少なく,より自然な状態で顎運動測定が可能となった.今回被験者1名に対し,本装置により顎運動の測定を行い,下顎切歯点だけでなく左右顆頭点など下顎任意点の運動も同時測定が可能であることが確認された
High sensitivity permeability measurements of striped films obtained by input impedance Peer-reviewed

S Yabukami, TUM Yamaguchi, KI Arai, M Takezawa

IEEE TRANSACTIONS ON MAGNETICS　37　(4)　2776-2778　2001/07
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/20.951304 　

ISSN：0018-9464

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We propose a new method to measure the permeability of striped films. The permeability can be obtained by the change in the input impedance of the film. The sensitivity of these measurements are compared with the figure-eight coil method. The sensitivity of the method is estimated over 100 times greater than a conventional figure-eight coil method. The permeability of striped CoNbZr films (100 mum wide) can be measured accurately using this permeameter.
A high frequency carrier-type magnetic field sensor using carrier suppressing circuit

S Yabukami, T Suzuki, N Ajiro, H Kikuchi, A Yamaguchi, KI Arai

IEEE TRANSACTIONS ON MAGNETICS　37　(4)　2019-2021　2001/07
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/20.951040 　

ISSN：0018-9464

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A highly sensitive high frequency carrier-type magnetic field sensor based on the giant magnetoimpedance effect has been developed. It has been combined with a high frequency carrier suppressing circuit to reduce carrier phase noise dramatically. Highly sensitive magnetic field resolution of 8.8 x 10(-7) Oe (8.8 x 10(-11)T) was demonstrated.
Wireless AC magnetic markers for motion capturing Peer-reviewed

M Yamaguchi, N Ajiro, S Yabukami, KI Arai, A Itagaki, S Tsuji, N Wako

IEEE TRANSACTIONS ON MAGNETICS　37　(4)　2016-2018　2001/07
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/20.951039 　

ISSN：0018-9464

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This paper reports on design criteria and characteristics of a wireless ac marker that will be used for a magnetic motion capturing system capable of sensing multiple markers. The calculation of generated magnetic fields agrees with experimental result, demonstrating usefulness for designing ac markers. These simulations indicate fields as large as 0.19 A/m can be generated at 0.1 m from the marker edge by using a ferrite of 1.5 nun diameter and a layer of 72 parallel windings of 0.11 mm diameter wire, where the copper losses is close to the core losses.
Motion capture system of magnetic markers using three-axial magnetic field sensor Peer-reviewed

S Yabukami, H Kikuchi, M Yamaguchi, KI Arai, K Takahashi, A Itagaki, N Wako

IEEE TRANSACTIONS ON MAGNETICS　36　(5)　3646-3648　2000/09
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/20.908928 　

ISSN：0018-9464

eISSN：1941-0069

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We have developed a magnetic motion capture system consisting of up to two magnetic markers (Nd-Fe-B magnet) and four three-axial sensors. The position and orientation of the magnetic makers (dipole) are detected by measuring the magnetic field of markers, Position accuracy of one marker is about 3 mm when a marker is located 150 mm from a sensor, position accuracy of two markers is about 20 mm when the markers are located 150 mm from sensors, The most common error source is cross talk between the cores of three-axial sensors.
Sandwich films - Properties of a new soft magnetic material

SX Wang, NX Sun, M Yamaguchi, S Yabukami

NATURE　407　(6801)　150-151　2000/09
Publisher: MACMILLAN PUBLISHERS LTD
ISSN：0028-0836
An evaluation of permeability for striped thin films in the gigahertz range

S Yabukami, M Takezawa, T Uo, M Yamaguchi, KI Arai, Y Miyazawa, M Watanabe, A Itagaki, H Ando

JOURNAL OF APPLIED PHYSICS　87　(9)　5998-6000　2000/05
Publisher: AMER INST PHYSICS
DOI： 10.1063/1.372592 　

ISSN：0021-8979

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We developed the fully automatic permeameter which is made of driving plates and shielded loop coil available in 1 MHz-3GHz. We clarified the sensitivity of the permeameter and the sensitivity can be explained by an uncertainty of network analyzer. We evaluate the permeability of striped CoNbZr films (50, 20, 10 mu m wide). A reasonable relation between permeability spectrum and domain observations can be demonstrated. (C) 2000 American Institute of Physics. [S0021-8979(00)91608-6].
Development of multilayer planar flux sensing coil and its application to 1 MHz-3.5 GHz thin film permeance meter Peer-reviewed

M Yamaguchi, S Yabukami, KI Arai

SENSORS AND ACTUATORS A-PHYSICAL　81　(1-3)　212-215　2000/04
Publisher: ELSEVIER SCIENCE SA
DOI： 10.1016/S0924-4247(99)00124-7 　

ISSN：0924-4247

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We have developed a new planar flux sensing coil using multilayer printed wiring board fabrication technique, The coil is useful for high frequency magnetic flux sensing because the coil is sensitive to the magnetic field and insensitive to the electric field, A 1 MHz-3.5 GHz broad bandwidth thin-film permeance meter is developed by using parallel plates with shout plate, and shielded loop pickup coil combination. We investigated the upper frequency limit of permeance measurement is given by the minimum value of standing wave position at the center of pickup coil. (C) 2000 Elsevier Science S.A. All rights reserved.
Development of magnetic micro-machine system for use in medical applications

ISHIYAMA Kazushi, SENDOH Masahiko, YABUKAMI Shin, YAMAZAKI Aya, YAMAGUCHI Masahiro, ARAI KenIchi, HAYASE Toshiyuki

The proceedings of the JSME annual meeting　2000　309-310　2000
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2000.1.0_309 　

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To develop micro-machines for use in medical application, two kinds of spiral-type magnetic micro-machine, which is driven by an external rotational magnetic field, were fabricated. These machines constructed by permanent magnets and spiral blade. It was demonstrated that changing the direction of the rotation planet of the external rotational field could control swimming direction of the swimming type magnetic micro-machine. The radius of the bend depended on the viscosity of the fluid and on the frequency of the external field. The another magnetic micro-machine could run in a gel and even in bovine meat. Running behavior of the machine depend on a frequency and strength of the external field. In addition, it can be detected where position of the magnetic micro-machine by a magnetic motion capture system.
薄膜シールディドループコイルの開発と集積回路の近傍磁界計測 Peer-reviewed

万木弘之, 薮上信, 山口正洋, 荒井賢一, 増田則夫, 玉置尚哉, 遠矢弘和

電気学会論文誌Ａ（基礎・材料・共通部門誌）　120　313-319　2000
Two dimensional electromagnetic noise imaging system using planar shielded-loop coil Array Peer-reviewed

M. Yamaguchi, S. Yabukami, K. I. Arai, K. Itagaki, N. Saito, K. Fuda, M. Watanabe, H. Takahashi, T. Tamogami, Y. Sakurada, A. Itagaki

1999 International Symposium on Electromagnetic Compability　51　51-54　1999/04
Noise analysis of a 1 MHz 3 GHz magnetic thin film permeance meter

S Yabukami, M Yamaguchi, KI Arai, M Watanabe, A Itagaki, H Ando

JOURNAL OF APPLIED PHYSICS　85　(8)　5148-5150　1999/04
Publisher: AMER INST PHYSICS
DOI： 10.1063/1.369106 　

ISSN：0021-8979

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We analyzed the permeability measurement error of a low permeance thin film. We clarified that the noise voltage was excited by a current loop which is composed of the coaxial cable and the ground plane. The current loop should be removed for high sensitivity of the permeameter. The permeability of a high electrical resistivity film (CoFeHfO) has been demonstrated 1 MHz-3.5 GHz. (C) 1999 American Institute of Physics. [S0021-8979(99)78908-5].
Two-Dimensional High-Resolution Mapping System for Electromagnetic Noise

YAMAGUCHI M., YABUKAMI S., NAKADA K., ARAI K.I., ITAGAKI A., ITAGAKI K., SAITO N., FUDA K., WATANABE M., TAKAHASHI H., TAMOGAMI T., SAKURADA Y.

Journal of the Magnetics Society of Japan　22　(4)　849-852　1998
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.22.849 　

ISSN：0285-0192

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We developed a near-field magnetic noise mapping system by using a shielded-loop type coil array. High-resolution (0.1 mm) two-dimensional magnetic field vector detection was realized. We demonstrated a noise map of the loop antenna, microstrip line, and printed circuit board of a personal computer.
HF-UHF Band Electromagnetic Measurements Using Multi-Layer Printed Wiring Board

YABUKAMI S., YAMAGUCHI M., ARAI K.

ITE Technical Report　21　(56)　21-26　1997/09/26
Publisher: The Institute of Image Information and Television Engineers
DOI： 10.11485/itetr.21.56.0_21 　

ISSN：1342-6893

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We have developed new microstrip line type pick up coil and shielded loop type coil, which are planar type pickup coil using by multi layer printed wiring board technique. Magnetic thin film permeability can be measured from 1MHz-3.5GHz range to take into account of electric field and impedance matching. We developed electromagnetic noise mapping system using by shielded loop type coil array. High resolution (0.1mm) and vector detection can be realized.
Magnetic flux sensing principle of microstrip pickup coil

S Yabukami, K Kikuchi, M Yamaguchi, KI Arai

IEEE TRANSACTIONS ON MAGNETICS　33　(5)　4044-4046　1997/09
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/20.619657 　

ISSN：0018-9464

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We investigated the operating mechanism of the microstrip-line type pickup coil user for thin-film permeance measurements up to GHz range. We found that some flux lines form continuous loops around the ground plane when the coil has a sample window. How the flux distribution changes and how the induced voltage increases when a magnetic sample is inserted was clarified by measurements of flux distribution and finite element calculations.
A new 1MHz-2GHz permeance meter for metallic thin films

M Yamaguchi, S Yabukami, KI Arai

IEEE TRANSACTIONS ON MAGNETICS　33　(5)　3619-3621　1997/09
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/20.619516 　

ISSN：0018-9464

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We have developed a permeance meter in the 1MHz-2GHz range using shielded loop type pickup coil. The effect of grounding between drive coil and pickup coil was analyzed using time domain reflectometry (TDR). The grounding increased the output voltage and eliminated the multiple reflections in the drive coil. Using the grounding, magnetic thin film permeance can be measured accurately over a wide frequency range.
High Frequency Permeance Measurements Using a Shielded Loop Coil

YABUKAMI S., YAMAGUCHI M., ARAI K.I.

Journal of the Magnetics Society of Japan　21　(4-2)　813-816　1997
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.21.813 　

ISSN：0285-0192 1880-4004

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We have developed a 1 MHz-2 GHz thin-film permeance meter using a shielded loop-coil type pickup coil. To measure the permeance accurately up to the GHz region, it is necessary to consider impedance matching throughout the driving plates and pickup coil, mode matching of the pickup coil, electromagnetic mode in the driving plates, and the voltage induced by an electric field. Errors can be reduced in the 500 MHz to 2 GHz range by taking account of the change in the input impedance of the pickup coil with and without a magnetic sample.
Electromagnetic Noise Measurement System Using a Magnetic Field Sensing Coil Array

YABUKAMI S., ITAGAKI A., WATANABE M., NAKADA K., YAMAGUCHI M., ARAI K.I.

Journal of the Magnetics Society of Japan　21　(4-2)　809-812　1997
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.21.809 　

ISSN：0285-0192 1880-4004

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We developed a near-field magnetic noise measurement system using a shielded-loop-type 432 coil array. To allow measurement of magnetic noises from 1 MHz to several hundred MHz, we took account of the voltage induced by the magnetic field in the pickup coil, impedance matching at the crossing points of lead lines, and the size of ground plane. High resolution of the measurement position can be obtained by using the XY-stage.
A new permeance meter based on both lumped elements/transmission line theories

M Yamaguchi, S Yabukami, KI Arai

IEEE TRANSACTIONS ON MAGNETICS　32　(5)　4941-4943　1996/09
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/20.539295 　

ISSN：0018-9464

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We have developed a new permeance meter in the 1MHz - 1.5 GHz range using either a microstrip pickup coil or a shielded loop pickup coil. Both pickup coils and the driving plates are free from LC resonance due to impedance matching. In the MHz range we must consider signal-to-noise ratio of the pickup coil. In the GHz range we must eliminate a voltage induced by electric field, and an electromagnetic higher order mode in a driving plates.
Electromagnetic noise measurements using microstrip coil array

M Yamaguchi, S Yabukami, M Watanabe, A Itagaki, KI Arai

IEEE TRANSACTIONS ON MAGNETICS　32　(5)　4920-4922　1996/09
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/20.539288 　

ISSN：0018-9464

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We developed a microstrip coil array with diode switch circuits using multilayer printed wiring board. Electromagnetic noise maps were obtained by the coil array. Its advantages are its broadband sensitivity and reduced noise measurement time compared with conventional closed field probes. We took account of impedance matching throughout the coils and lead wiring, sensitivity calibration between coils and cross talk between neighboring coils in the design.
Thin-Film Permeance Measurements in the Broadband Range Invited Peer-reviewed

薮上信, 山口正洋, 荒井賢一

Journal of the Magnetics Society of Japan　20　(4)　846-848　1996
High-Frequency Permeance Measurements Using a Microstrip Coil

YABUKAMI S., WATANABE M., KIKUCHI H., YAMAGUCHI M., ARAI K. I.

Journal of the Magnetics Society of Japan　20　(2)　589-592　1996
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.20.589 　

ISSN：0285-0192 1880-4004

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We developed a new thin-film permeance meter that is effective from 10 MHz to 1.5 GHz, using a microstrip pickup coil that senses the change in flux in a film sample driven in the TEM propagation mode. The microstrip pickup coil allows broader-band measurement of the permeance than a figure-8-coil, because impedance matching is provided. The influences of the exciting electric fields and the higher-order mode in the driving coil on the permeance measurement are analyzed. A strong de field (170 Oe) is applied parallel to the easy axis during the reference voltage measurement in order to eliminate the influence of the electric field.
Measuring Noise from a Personal Computer by Using a Microstrip Coil Array

YABUKAMI S., WATANABE M., YAMAGUCHI M., ARAI K. I.

Journal of the Magnetics Society of Japan　20　(2)　529-532　1996
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.20.529 　

ISSN：0285-0192 1880-4004

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A configuration of microstrip-line-type coils was developed for measuring electromagnetic noise. The measurement system consists of a microstrip-line-type coil array,diode switch circuits, an amplifier, and a spectrum analyzer.Some measurements of noise from a personal computer obtained by means of this system are presented.
HIGH-FREQUENCY MAGNETIC-FIELD SENSING COIL USING MICROSTRIP LINE

M YAMAGUCHI, S YABUKAMI, KI ARAI

IEEE TRANSACTIONS ON MAGNETICS　31　(6)　3173-3175　1995/11
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/20.490318 　

ISSN：0018-9464

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An analysis of magnetic field sensing coil using microstrip line is presented. Broad-bandwidth magnetic sensor is built in which the characteristic impedance is determined to be 50 Omega. We examined the coil size dependence for the output voltage and coil impedance as well as three dimensional ac field analysis. The output voltage of the coil is produced by a varying magnetic field linking the closed circuit loop which is composed of the microstrip conductor, 50 Omega resistor, and the ground plane below radiation frequency. Eddy current generated in the ground plane decreases the output voltage of microstrip coil. Optimum design depends on the trade off between impedance matching and increase in output voltage.
マイクロストリップ線路を用いた高周波磁界検出コイル

山口正洋, 薮上信, 荒井賢一

日本応用磁気学会誌　19　(2)　525-528　1995

DOI： 10.3379/jmsjmag.19.525 　

ISSN：0285-0192 1880-4004
Analysis of Magnetic Shielding Effects for Thin-Film Inductors Peer-reviewed

M. Yamaguchi, S. Yabukami, K. I. Arai

IEEE Translation Journal on Magnetics in Japan　9　(6)　72-77　1994

DOI： 10.1109/TJMJ.1994.4565960 　

ISSN：0882-4959

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Issues related to magnetic shielding effects are discussed for inner-coil type thin-film inductors with closed magnetic circuits. The relationship between magnetic shielding effects, mutual inductance, and proximity effects are investigated using the finite integral equation method. The results show that obvious shielding effects occur in the inductors and that the mutual inductance is not influenced by the shielding effects. © 1994 IEEE.
磁気シールド効果を考慮した薄膜インダクタの特性解析

山口正洋, 薮上信, 荒井賢一

日本応用磁気学会誌　18　(2)　507-510　1994

DOI： 10.3379/jmsjmag.18.507 　

ISSN：0285-0192 1880-4004
ESTIMATION OF THE IN-SITU PERMEABILITIES IN THIN-FILM INDUCTORS

M YAMAGUCHI, S ARAKAWA, S YABUKAMI, KI ARAI, F KUMAGAI, S KIKUCHI

IEEE TRANSACTIONS ON MAGNETICS　29　(6)　3210-3212　1993/11
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/20.281139 　

ISSN：0018-9464

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We investigated the in-situ average permeabilities of thin-film inductors regarding process damages, domain structure, local demagnetizing field and effective air gap in the inductor. It is estimated that the effective air gaps were most responsible for the values of the in-situ permeabilities of a meander-coil type thin-film inductor with dosed magnetic circuit.

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Misc. 136

Evaluation of antigen-antibody reaction of magnetic nanoparticles with directly adsorbed antibodies

米山毅, 村山徹, TONTHAT Loi, 桑波田晃弘, 薮上信, 佐藤佑哉, 寺村裕治, 大坪和香子, 小川智之

日本磁気学会学術講演概要集　45th　2021

ISSN：1882-2959
High frequency permeability measurement of magnetic thin film by microstrip probe

2019　(133)　13-16　2019/12/05
Publisher: 電気学会
磁気ハイパーサーミアのための感温磁性微粒子の位置・温度情報のワイヤレス検知技術に関する研究開発

LOI Ton That, 安藝史崇, 山本良之, 齊藤元, 薮上信, 水戸部一孝

日本生体医工学会大会プログラム・抄録集(Web)　58th　2019
Study on new measurement technique of magnetization dynamics for magnetic thin films

2018　(81)　53-57　2018/08/09
Publisher: 電気学会
Measurement of bacteria using magnetic beads by switching magnetic field

薮上信, 小野寺英彦, 植竹宏明, 佐藤幸, 宮内啓介, 遠藤銀朗, 三浦由則, 高橋英樹, 児玉毅靖

電気学会マグネティックス研究会資料　MAG-17　(211-214.216-227)　13‐16　2017/12/14
スイッチ磁界に対する磁気ビーズの応答を利用した細菌検出

薮上信, 小野寺英彦, 植竹宏明, 佐藤幸, 宮内啓介, 遠藤銀朗, 三浦由則, 高橋英樹, 児玉毅靖

日本磁気学会学術講演概要集　41st　51　2017/09/05

ISSN：1882-2959
High frequency magnetoelectric effect in FeCo-MgF nanogranular films

2017　(86)　11-16　2017/08/07
Publisher: 電気学会
バイアス通電によるミアンダコプレーナ薄膜磁界センサ

薮上信, 植竹宏明, 森谷健太, 冨並剛, 小野寺英彦

電気学会全国大会講演論文集(CD-ROM)　2017　2017
A Development of High speed Tracking System for Magnetic Wireless Marker Using Field Programmable Gate Array

50　(1)　9-14　2016/02
Publisher: 東北学院大学工学部工学会
ISSN：0286-5904
Magnetic Field Sensor(1)General Introduction

11　(3)　156-163　2016
Publisher: 日本応用磁気学会
ISSN：1880-7208
FPGAを用いた磁気マーカ高速位置検出システムの試作 (工学総合研究所研究発表会) -- (一般講演)

高橋和輝, 薮上信, 小澤哲也

東北学院大学工学総合研究所紀要 Bulletin of Research Institute for Engineering and Technology, Tohoku Gakuin University　(4)　29-35　2015/03
Publisher: 東北学院大学工学総合研究所
Meandering coplanar line type thin film magnetic field sensor

植竹宏明, 川上敏弥, 森谷健太, 薮上信, 小澤哲也

電気学会マグネティックス研究会資料　MAG-15　(98-103)　2015
ミアンダコプレーナ線路構造の薄膜磁界センサ素子

植竹宏明, 川上敏弥, 森谷健太, 薮上信, 小澤哲也

日本磁気学会学術講演概要集　39th　2015

ISSN：1882-2959
FPGAを用いたワイヤレス磁気マーカ高速位置検出システム

冨並剛, 高橋和輝, 薮上信, 小澤哲也, 枦修一郎, 金高弘恭

電気関係学会東北支部連合大会講演論文集　2015　(0)　42-42　2015
Publisher: 電気関係学会東北支部連合大会実行委員会
DOI： 10.11528/tsjc.2015.0_42 　
Recent Progress of High-Frequency Micromagnetics

高周波マイクロ磁気応用技術調査専門委員会, 佐藤敏郎, 遠藤恭, 曽根原誠, 池田賢司, 池田愼治, 井上光輝, 猪鼻武司, 島田寛, 菅原英州, 竹内輝明, 竹澤昌晃, 田邉信二, 辻本浩章, 直江正幸, 中山俊英, 増田則夫, 松下伸広, 宗像誠, 茂呂英治, 薮上信, 山口正洋, 山本節夫

技術報告　1313　1-49　2014/07/25
Publisher: 電気学会
FPGAを用いたワイヤレス磁気マーカ高速位置検出システム

高橋和輝, 薮上信, 小澤哲也, 藤岡修, 枦修一郎, 金高弘恭

電気関係学会東北支部連合大会講演論文集　2014　(0)　71-71　2014
Publisher: 電気関係学会東北支部連合大会実行委員会
Permeability measurement of magnetic thin film by microstrip line

KIMURA Takafumi, YABUKAMI Shin, OZAWA Tetsuya, MIYAZAWA Yasunori, KENJU Hiroyuki, SHIMADA Yutaka

2013　(68)　61-64　2013/08/07
MCG measurement out of shielded room using transmission line type thin film sensor

YABUKAMI Shin, KATO Kazuo, OZAWA Tetsuya, KOBAYASHI Nobukiyo, ARAI KenIchi

2013　(28)　97-100　2013/06/20
Enhancement of Magnetic Field Detection of Transmission Line Type Thin Film Sensor using Dielectric Film

UETAKE Heroaki, YABUKAMI Shin, SAITO Yoshinori, CHIBA Tomoaki, OZAWA Tetsuya, KOBAYASHI Nobukiyo, ARAI KenIchi

2013　(48)　41-44　2013/06/13
Position sensing system using LC resonated narrow marker

MORI O, NAKANO H, YABUKAMI S, OZAWA T, ISHII O, KANETAKA H, HASHI S

電気学会研究会資料. MAG, マグネティックス研究会　2013　(1)　45-48　2013/02/28
Probe of measuring thin film permeability using skin effect

SATO Akira, YABUKAMI Shin, OZAWA Tetsuya, MIYAZAWA Yasunori, SHIMADA Yutaka

2012　(169)　31-34　2012/12/20
MCG measurements in multi point using transmission line type thin film sensor

YABUKAMI Shin, MIYAGI Riyouta, ARIMA Naoto, KATO Kazuo, OZAWA Tetsuya, KOBAYASHI Nobukiyo, ARAI Ken Ichi

2012　(83)　47-50　2012/11/16
Highly accurate thin film sensor using coplanar line

KIMURA Takafumi, NAKANO Hiromichi, YABUKAMI Shin, OZAWA Tetsuya, KOBAYASHI Nobukiyo, ARAI Ken Ichi, IKEDA Kenji

2012　(81)　31-34　2012/09/24
Eddy Current Testing Using GIGS Magnetic Field Sensor

OZAWA Tetsuya, YABUKAMI Shin, TOTSUKA Jun, NAGATA Seiichi, NAOE Masayuki, KOBAYASHI Nobukiyo, KANETA Yasushi, ARAI Ken Ichi

2012　(81)　35-38　2012/09/24
Measurements of Broadband Permeability in Thin Film by Using Microstrip Line Probe

YABUKAMI S., SATO A., OZAWA T., SHIOKAWA T., MIYAZAWA Y., SHIMADA Y., MUNAKATA M.

2012　(57)　49-52　2012/06/21
The trend of magnetic applications in medical technology (3) : Magnetic applications for bio-sensing technique

UCHIKAWA Y., KOBAYASHI K., YABUKAMI S., YAMADA S., SASADA I.

2012　(12)　11-16　2012/02/21
Scanning System Using Transmission Line Type Thin Film Sensor

YABUKAMI Shin, NAKANO Hiromichi, KOJIMA Ken, OZAWA Tetsuya, KOBAYASHI Nobukiyo, NAKAI Tomoo, ARAI Ken Ichi

2011　(91)　23-26　2011/11/24
Development of motion capture system using magnetic ribbon type marker

MORI O, NAKANO H, AKAMA F, YABUKAMI S, OZAWA T, ISHII O, HASHI S, KANETAKA H

電気学会研究会資料. MAG, マグネティックス研究会　2011　(52)　51-55　2011/09/19
ミアンダ形プローブを用いた10.6GHzまでの薄膜透磁率計測

薮上信, 佐藤彰, 小澤哲也, 宮澤安範, 島田寛, 宗像誠, 塩川孝泰

電気学会研究会資料. MAG, マグネティックス研究会　2011　(31)　27-30　2011/08/03
A Fabrication of Transmission Line Type Thin Film Magnetic Field Sensor

YACHIDATE Ai, SATO Koji, SATO Akira, YABUKAMI Shin, OZAWA Tetsuya, KOBAYASHI Nobukiyo, NAKAI Tomoo, ARAI Kenichi

2010　(199)　1-4　2010/12/16
Evaluation of Permeability Distribution of Magnetic Thin Film by Meander-Type Probe

TAKAHASHI J., YABUKAMI S., OZAWA T., MIYAZAWA Y., YANAGI K., SHIMADA Y.

2010　(199)　47-51　2010/12/16
Sensitivity enhancement of transmission line type thin film sensor using by high permittivity substrate

KOJIMA Ken, SATO Kouji, YABUKAMI Shin, KATOU Kazuo, OZAWA Tetuya, KOBAYASHI Nobukiyo, ARAI KenIchi

2010　(157)　49-52　2010/11/26
Position sensing system of nasogastric tube using long LC resonated maker

SATO R, YABUKAMI S, OZAWA T, KANETAKA H, HASHI S

電気学会研究会資料. MAG, マグネティックス研究会　2010　(106)　19-22　2010/09/21
An attempt to measure permeability of magnetic thin film by meander conductor line

TAKAHASHI J., SATO A., YABUKAMI S., OZAWA T., MIYAZAWA Y., YANAGI K., SHIMADA Y.

2010　(79)　59-62　2010/08/02
Wireless magnetic motion capture system for medical use

Kanetaka H, Yabukami S, Hashi S, Arai K I

2010/03
ワイヤレス磁気マーカによる生体挿入チューブの位置検出装置の開発

薮上信

医科学応用研究財団研究報告　29　127-131　2010
Publisher: 鈴木謙三記念医科学応用研究財団
ISSN：0914-5117
Coils configuration and detection accuracy of position sensing system

HASHI Shuichiro, KANETAKA Hiroyasu, ISHIYAMA Kazushi, YABUKAMI Shin, ARAI Ken Ichi

電気学会研究会資料. MAG, マグネティックス研究会　2009　(207)　1-4　2009/12/16
Jaw tracking system using resonated wireless markers

YABUKAMI S, KANETAKA H, HASHI S, ARAI K. I

電気学会研究会資料. MAG, マグネティックス研究会　2009　(86)　1-5　2009/09/25
A Measurement of Magnetocardiogram (MCG) by Planar Type Sensor using CoNbZr Film

YABUKAMI S., OHTOMO Y., KATO K., OZAWA T., ARAI K. I.

2009　(76)　39-42　2009/08/07
An Improvement of Position Accuracy for a Wireless Magnetic Marker Tracking System

YABUKAMI S, HASHI S, KANETAKA H, ARAI K. I

電気学会研究会資料. MAG, マグネティックス研究会　2008　(84)　29-33　2008/07/31
High-Frequency Carrier-Type Magnetic Field Sensor with a Sub-pT Resolution

YABUKAMI S., SAITOH H., WATANABE H., ARAI K. I.

2007　(42)　41-44　2007/07/12
Study on positional accuracy of wireless motion capture system using LC resonant magnetic marker

TOYODA M., HASHI S., OHYA M., OKAZAKI Y., YABUKAMI S., ISHIYAMA K., ARAI K. I.

2006　(167)　61-66　2006/12/19
Enhancement of High-Frequency-Carrier Type Magnetic Field Sensors

MURAYAMA Yoshitaka, YABUKAMI Shin, OZAWA Tetsuya, ISHIYAMA Kazushi, ARAI Ken-Ichi

2006　(19)　51-56　2006/03/09
Position detection system for LC resonating Marker Using Phase Detection

KATOH T., YABUKAMI S., ARAI K. I., HASHI S., OKAZAKI Y.

2005　(174)　103-108　2005/12/12
Basic Properties of Micropump with Magnetic Micromachine

HISATOMI Shinichi, YAMAZAKI Aya, ISHIYAMA Kazushi, SENDOH Masahiko, YABUKAMI Shin, AGATSUMA Shigeto, MOROOKA Keiko, ARAI Ken Ichi

2005　(124)　119-123　2005/12/05
Development of wireless magnetic multi-position detecting system using FFT analysis

TOYODA M., HASHI S., YABUKAMI S., OHYA M., ISHIYAMA K., OKAZAKI Y., ARAI K. I.

2005　(124)　97-101　2005/12/05
Design of High Frequency Carrier Type Thin Film Sensor

YABUKAMI S., MURAYAMA Y., HORIKOSHI N., OZAWA T., ISHIYAMA K., ARAI K. I.

2005　(124)　15-20　2005/12/05
High-Frequency-Carrier Type Thin Film Magnetic Field Sensor by controlling annealing temperature and cross sectional shape

MURAYAMA Y., OZAWA T., YABUKAMI S., ISHIYAMA K., ARAI K. I.

2005　(50)　13-16　2005/07/14
A Development of a Position Sensing System Using Planar Spiral Coils

KOUNO Takeshi, YABUKAMI Shin, AGATSUMA Shigeto, ARAI Ken Ichi, KANETAKA Hiroyasu

電気学会研究会資料. MAG, マグネティックス研究会　2005　(50)　7-11　2005/07/14
Impedance property of thin film GMI sensor with controlled inclined angle of stripe magnetic domain

T Nakai, H Abe, S Yabukami, KI Arai

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　290　1355-1358　2005/04
Publisher: ELSEVIER SCIENCE BV
DOI： 10.1016/j.jmmm.2004.11.436 　

ISSN：0304-8853

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The giant magnetoimpedance (GMI) effect of controlled-inch nation magnetic stripe domain for a thin-film GMI sensor is investigated. The inclined stripe domain structure has an inclined angle of domain walls against the transverse direction of the rectangular-strip element. It is obtained that GMI profile changes from a profile with a dip point at the zero magnetic field to a profile with one maximum impedance only at the zero field at an angle of 70&DEG;. In the case of GMI profile with a dip point, increasing the inclination angle decreases the bias field. This reduction of the bias field more than triples the sensor gain. An excellent linear property extending for wide range is obtained. A steplike impedance change property is also realized by this method. &COPY; 2004 Elsevier B.V. All rights reserved.
Impedance property of thin film GMI sensor with controlled inclined angle of stripe magnetic domain

T. Nakai, H. Abe, S. Yabukami, K. I. Arai

Journal of Magnetism and Magnetic Materials　290-291　1355-1358　2005/04

DOI： 10.1016/j.jmmm.2004.11.436 　

ISSN：0304-8853

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The giant magnetoimpedance (GMI) effect of controlled-inclination magnetic stripe domain for a thin-film GMI sensor is investigated. The inclined stripe domain structure has an inclined angle of domain walls against the transverse direction of the rectangular-strip element. It is obtained that GMI profile changes from a profile with a dip point at the zero magnetic field to a profile with one maximum impedance only at the zero field at an angle of 70°. In the case of GMI profile with a dip point, increasing the inclination angle decreases the bias field. This reduction of the bias field more than triples the sensor gain. An excellent linear property extending for wide range is obtained. A steplike impedance change property is also realized by this method. © 2004 Elsevier B.V. All rights reserved.
A study of position detecting system using LC resonant magnetic marker

TOKUNAGA Y., HASHI S., YABUKAMI S., KOHNO T., TOYODA M., OZAWA T., OKAZAKI Y., ARAI K. I.

28　377-377　2004/09/21
Development of tracking system of LC resonated magnetic marker

YABUKAMI S., KOHNO T., HASHI S., OZAWA T., ARAI K. I., OKAZAKI Y.

28　376-376　2004/09/21
Development of AC magnetic field Measurement system using phase difference detection of high-frequency carrier thin film magnetic sensor

OZAWA T., MAWATARI H., YABUKAMI S., ARAI K. I.

28　210-210　2004/09/21
A Design of High-Frequency-Carrier Type Thin Film Magnetic Field Sensor

HORIKOSHI N., YABUKAMI S., MURAYAMA Y., OZAWA T., MAWATARI H., ISHIYAMA K., ARAI K. I.

28　208-208　2004/09/21
Measurement of Low frequency magnetic field using High Frequency carrier-type magnetic sensor

MURAYAMA Y., OZAWA T., YABUKAMI S., ISHIYAMA K., AGATSUMA S., ARAI K. I.

28　209-209　2004/09/21
Development of enhanced phase difference detection type magnetic field sensor by applying high-frequency carrier type thin film magnetic sensor

OZAWA T., YOKOTA C., HORIKOSHI N., YABUKAMI S., ARAI K. I.

28　211-211　2004/09/21
Development of jaw tracking system using flat spiral coil

KOHNO T, YABUKAMI S, KANETAKA H, ARAI K. I, MITANI H

日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan　28　375-375　2004/09/21
High-frequency carrier type thin-film sensor using low-noise crystal oscillator

S Yabukami, H Mawatari, Y Murayama, T Ozawa, K Ishiyama, KI Arai

IEEE TRANSACTIONS ON MAGNETICS　40　(4)　2670-2672　2004/07
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/TMAG.2004.828960 　

ISSN：0018-9464

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We have developed a very sensitive high-frequency carrier-type magnetic field sensor based on the giant magneto-impedance effect available at lower frequencies. Our approach is to optimize the sensor structure so as to obtain high impedance. In addition, we optimize the carrier suppressing circuit using a low-noise crystal oscillator to reduce the phase noise of the lower offset frequency (under 1 kHz) as a carrier source. When a small ac magnetic field is applied to the sensor element, a very small AM signal can be detected using a carrier suppressing circuit with a low-noise crystal oscillator. A resolution of 1.7 x 10(-8) Oe/Hz(1/2) was obtained at 501 kHz. The detectable magnetic field is limited by the thermal noise of room temperature. Resolutions of 1.5 x 10(-7) Oe/Hz(1/2) at 1 kHz and a resolution of 1.1 x 10(-6) Oe/Hz(1/2) at 110 Hz were demonstrated. The resolution was basically limited by the phase noise of the crystal oscillator.
High-frequency carrier type thin-film sensor using low-noise crystal oscillator

S Yabukami, H Mawatari, Y Murayama, T Ozawa, K Ishiyama, KI Arai

IEEE TRANSACTIONS ON MAGNETICS　40　(4)　2670-2672　2004/07
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI： 10.1109/TMAG.2004.828960 　

ISSN：0018-9464

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We have developed a very sensitive high-frequency carrier-type magnetic field sensor based on the giant magneto-impedance effect available at lower frequencies. Our approach is to optimize the sensor structure so as to obtain high impedance. In addition, we optimize the carrier suppressing circuit using a low-noise crystal oscillator to reduce the phase noise of the lower offset frequency (under 1 kHz) as a carrier source. When a small ac magnetic field is applied to the sensor element, a very small AM signal can be detected using a carrier suppressing circuit with a low-noise crystal oscillator. A resolution of 1.7 x 10(-8) Oe/Hz(1/2) was obtained at 501 kHz. The detectable magnetic field is limited by the thermal noise of room temperature. Resolutions of 1.5 x 10(-7) Oe/Hz(1/2) at 1 kHz and a resolution of 1.1 x 10(-6) Oe/Hz(1/2) at 110 Hz were demonstrated. The resolution was basically limited by the phase noise of the crystal oscillator.
Real Time Sensing System for Joint Movement with Responding Geomagnetic field and Alternative Marker

ARAI K., YABUKAMI S., ARAI K. I.

27　465-465　2003/09/01

ISSN：1340-8100
Estimation of High Frequency carrier-type magnetic thin film sensor by measuring phase difference

OZAWA T., MAWATARI H., MURAYAMA Y., YABUKAMI S., ARAI K. I.

27　319-319　2003/09/01

ISSN：1340-8100
High Frequency Carrier Type Magnetic Field Sensor with Thick Film

MAWATARI H., MURAYAMA Y., OZAWA T., YABUKAMI S., ISHIYAMA K., ARAI K. I.

27　318-318　2003/09/01

ISSN：1340-8100
Magnetic domain observation of HFC-type magnetic field sensor with inclined domain wall by applying longitudinal external field

NAKAI T., YABUKAMI S., ARAI K. I.

27　321-321　2003/09/01

ISSN：1340-8100
Development of jaw tracking system using two magnets

YABUKAMI S, ARAI K, KANETAKA H, TSUJI S, ARAI K. I

日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan　27　466-466　2003/09/01

ISSN：1340-8100
Phase detection of high frequency carrier type thin film sensor

S. Yabukami, H. Mawatari, O. Shimoe, H. Kikuchi, K. I. Arai

Intermag 2003 - Program of the 2003 IEEE International Magnetics Conference　2003
Publisher: Institute of Electrical and Electronics Engineers Inc.
DOI： 10.1109/INTMAG.2003.1230542 　

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In this paper we fabricated a phase detection circuit using a printed circuit board. The phase of the carrier signal was dramatically changed about 180 degrees around carrier suppression. This technique can be applied for very high sensitive magnetic field measurements.
Phase detection of high frequency carrier type thin film sensor

S. Yabukami, H. Mawatari, O. Shimoe, H. Kikuchi, K. I. Arai

Intermag 2003 - Program of the 2003 IEEE International Magnetics Conference　2003
Publisher: Institute of Electrical and Electronics Engineers Inc.
DOI： 10.1109/INTMAG.2003.1230542 　

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In this paper we fabricated a phase detection circuit using a printed circuit board. The phase of the carrier signal was dramatically changed about 180 degrees around carrier suppression. This technique can be applied for very high sensitive magnetic field measurements.
A new tracking system of jaw movement using two magnets

Shin Yabukami, Hiroyasu Kanetaka, Naoya Tsuji, Atsushi Itagaki, Masahiro Yamaguchi, Ken Ichi Arai, H. Mitani

Digests of the Intermag Conference　2002/12/01

ISSN：0074-6843

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A tracking system of jaw movement was analyzed using two magnets. The proposed system was designed and constructed which utilized small two permanent magnets on a lower incisor and on a forehead and 32 elements of two-axial fluxgate sensors. The results showed the measured position accuracy when the lower magnet was moved toward the bottom direction.
Evaluation of High Frequency Wiring of HDD Heads

YAMAGUCHI Masahiro, TESHIROGI Chikao, YOSHIDA Kazuya, KURIBARA Takashi, YABUKAMI Shin, KIKUCHI Shinki, ARAI Ken-Ichi

2002　(176)　21-26　2002/11/30
Anisotropy Field and GHz Permeability of Soft Magnetic Co-Fe-B Films

NAMIKAWA M., MUNAKATA M., YAGI M., MOTOYAMA M., SHIMADA Y., YABUKAMI S., YAMAGUCHI M., ARAI K. I.

2002　(114)　21-24　2002/10/10
A Motion Capturing System of Jaw Movement Using Two Magnets

YABUKAMI S, ARAI K, KANETAKA H, TSUJI S, ARAI K. I, MITANI H

電気学会研究会資料. MAG, マグネティックス研究会　2002　(107)　37-42　2002/10/09
Evaluation of High Frequency Properties of RW-Wires Used for HDD Heads

YAMAGUCHI Masahiro, TESHIROGI Chikao, YOSHIDA Kazuya, KURIBARA Takashi, YABUKAMI Shin, KIKUCHI Shinki, ARAI Ken-Ichi

IEICE technical report. Magnetic recording　102　(355)　5-8　2002/09/26
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN：0913-5685

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Beginning from the study of reproducibility of electric contact between the wafer probe and the RW wire,equivalent circuit parameters of RW-wires were extracted as ; Low frequency inductance of a pair of W-or R-wire was 30nH,which means each wire has inductance of 15nH or less.Low frequency resistance was 5Ω, showing the resistance of each wire as 2.5Ω.Stray capacitance were 2-3 pF at low frequency was 2GHz.Cross-talk model is also discussed.
Futures of micro-magnetic technology for medical and welfare field

ARAI K. I., ISHIYAMA K., YABUKAMI S., YAMAGUCHI M.

26　78-79　2002/09/01

ISSN：1340-8100
Characterization of HFC-Type magnetic field sensor with coplanar electrode by microwave probe

NAKAI T., ABE H., YAMAGUCHI M., YABUKAMI S., KIKUCHI H., ARAI K. I.

26　396-396　2002/09/01

ISSN：1340-8100
Motion capture system for input device

YABUKAMI S., ARAI K., ARAI K. I., OHSHIMA A., DAIGUJI M., ABE H.

26　420-420　2002/09/01

ISSN：1340-8100
High frequency carrier type thin film magnetic field sensor using phase detection

YABUKAMI S., MAWATARI H., SHIMOE O., KIKUCHI H., ARAI K. I.

26　397-397　2002/09/01

ISSN：1340-8100
Jaw tracking system using thin film sensors

YABUKAMI S, ARAI K, ARAI K. I, KANETAKA H, MITANI H, TSUJI N

日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan　26　355-355　2002/09/01

ISSN：1340-8100
Soft Magnetic Properties and Permeability of (CoFeB)-(SiO_2) Film with Very High Anisotropy Field

MUNAKATA M., NAMIKAWA M., YAGI M., MOTOYAMA M., SHIMADA Y., YABUKAMI S., YAMAGUCHI M., ARAI K. I.

2002　(92)　1-5　2002/08/26
複数磁気マーカを用いた新型顎運動測定装置の開発

金高弘恭, 薮上信, 河内満彦, 荒井賢一, 三谷英夫

日本咀嚼学会雑誌 : 咀嚼と健康 = Journal of Japanese Society for Masticatory Science and Health Promotion　11　(2)　166-167　2002/03/30
Publisher: (NPO)日本咀嚼学会
ISSN：0917-8090
Development of a new jaw movement analyzer by means of motion capture system of magnetic markers

H Kanetaka, S Yabukami, M Kawauchi, K Arai, H Mitani

JOURNAL OF DENTAL RESEARCH　81　A341-A341　2002/03
Publisher: INT AMER ASSOC DENTAL RESEARCHI A D R/A A D R
ISSN：0022-0345
Lower ac field detection using carrier suppressing circuit

KIKUCHI H., YABUKAMI S., YAMAGUCHI M., ARAI K. I., SUZUKI T.

25　95-95　2001/09/01

ISSN：1340-8100
An accuracy of motion capture system of small magnetic markers

YABUKAMI S., YAMAGUCHI M., ARAI K. I. ., TSUJI S., ITAGAKI A.

25　94-94　2001/09/01

ISSN：1340-8100
Fabrication and application of small-size magnetic AC maker

SATO S., KIKUCHI H., AJIRO N., YABUKAMI S., YAMAGUCHI M., ARAI K. I, KIKUCHI S.

25　92-92　2001/09/01

ISSN：1340-8100
High Frequency (10 MHz～3GHz) Permeability of (Ni, Zn, Fe)_3_O_4_ Films Prepared by Ferrite Plating at 90℃

D. Kuruma, M. Yamaguchi, S. Yabukami, Y. Kitamoto, N. Matsushita, K.I. Arai, M. Abe

Ferrite: Proceedings of The Eighth International Conference on Ferrites (ICF 8)　503-505　2001
High Frequency Permeability Measurements for Striped Thin Films

YABUKAMI S., OJIMA R., UO T., YAMAGUCHI M., ARAI K. I., KIKUCHI S.

2000　(326)　35-40　2000/12/20
A design of Magnetic AC Marker using resonance circuit

YABUKAMI S., AJIRO N., YAMAGUCHI M., ARAI K. I.

2000　(253)　59-63　2000/11/24
Fabrication and design of magnetic AC marker using resonance circuit for motion capture system

AJIRO N., YABUKAMI S., YAMAGUCHI M., ARAI K. I., ITAGAKI A., WAKO N.

2000　(218)　1-6　2000/10/06
Intermag2000会議報告

薮上信

電気学会論文誌. A, 基礎・材料・共通部門誌 = The transactions of the Institute of Electrical Engineers of Japan. A, A publication of Fundamentals and Materials Society　120　(10)　951-951　2000/10/01

ISSN：0385-4205
High frequency permeability measurement of striped films

YABUKAMI S., UO T., YAMAGUCHI M., ARAI K. I., TAKEZAWA M.

24　203-203　2000/09/01

ISSN：1340-8100
Magnetic ac marker using resonance circuit

AJIRO N., YABUKAMI S., YAMAGUCHI M., ARAI K. I., ITAGAKI A., WAKO N.

24　122-122　2000/09/01

ISSN：1340-8100
Carrier-suppressed circuit with magnetic field sensor

AJIRO N., KIKUCHI H., YABUKAMI S., YAMAGUCHI M., ARAI K. I., SUZUKI T.

24　121-121　2000/09/01

ISSN：1340-8100
High-frequency Carrier-type Thin-film Magnetic Field Sensor with An ac Field Resolution of 10^<-11>Tesla

KIKUCHI H., AJIRO N., YABUKAMI S., YAMAGUCHI M., ARAI K. I., SUZUKI T., TAKEZAWA M.

2000　(133)　1-6　2000/07/18
3D-Motion Capture System Using Magnetic Markers

YABUKAMI S., KIKUCHI H., YAMAGUCHI M., ARAI K. I., TAKAHASHI K., ITAGAKI A., WAKO N.

2000　(133)　43-48　2000/07/18
An Evaluation and A Sensitivity of Permeability Measurements for Striped Thin Films

YABUKAMI S., UO T., YAMAGUCHI M., ARAI K. I., MIYAZAWA Y., WATANABE M., ITAGAKI A., ANDO H., TAKEZAWA M., YAMASAKI J.

2000　(1)　25-30　2000/02/07
Fabrication of Transmissive Small-Sized High Efficiency Magnetic AC Marker

AJIRO Noriyuki, HASHI Syuichiro, YABUKAMI Shin, ISHIYAMA Kazushi, YAMAGUCHI Masahiro, ARAI KenIchi

Conference on Information, Intelligence and Precision Equipment : IIP　120-124　2000
Publisher: The Japan Society of Mechanical Engineers

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We design small magnetic AC markers and investigate its external magnetic field around a marker. We fabricate several AC markers (12.5mm-length, cross sectional are of marker was 15(mm)^2). Measured field of markers is agreed with theoretical field calculated by Biot-Savart's low. External field was about (10)^<-3> Oe, when we applied 1.5V at 425kHz and the distance between marker and sensor was 100mm.
Motion capture system using magnetic marker

S. Yabukami, H. Kikuchi, M. Yamaguchi, K. I. Arai, K. Takahashi, A. Itagaki, N. Wako

Digests of the Intermag Conference　38　3646-10　2000

DOI： 10.1109/INTMAG.2000.872261 　

ISSN：0074-6843

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A motion capture system with one marker was developed. The relation between the marker size and positioning error was determined, taking into account the noise level of sensor output.
Thin-film Shielded Loop Coil for Magnetic Near Field Measurement of High Densely Packaged PCBs

YURUGI H.

Transactions of the Institute of Electrical Engineers of Japan, A　120-A　(3)　313-319　2000
Thin-film Shielded-Loop Coil for Magnetic Near Field Measurement of High Density Packaged PCBs

T. IEE Japan　120-A　313-319　2000
A positioning system of magnetic marker

YABUKAMI S., KIKUCHI H., YAMAGUCHI M., ARAI K. I., TAKAHASHI K., ITAGAKI A., WAKO N.

23　155-155　1999/10/01
Magnetic near field detection using thin-film shielded loop coil

YURUGI H., YABUKAMI S., YAMAGUCHI M., ARAI K. I., MSUDA N., TAMAKI N., TOHYA H.

23　73-73　1999/10/01
High frequency permeability measurement of striped films

YABUKAMI S., UO T., TAKEZAWA M., YAMAGUCHI M., ARAI K. I., MIYAZAWA Y., WATANABE M., ITAGAKI A., ANDO H.

23　71-71　1999/10/01
磁気マーカによるモーションキャプチャシステムの開発 (日本バーチャルリアリテイ学会第4回大会) -- (ヒューマンセンシング)

薮上信, 菊池弘昭, 山口正洋

日本バ-チャルリアリティ学会大会論文集　4　71-74　1999/09/29
Publisher: 日本バ-チャルリアリティ学会
ISSN：1342-4564
High Spatial Resolution Magnetic Field Measurements Using Thin-Film Shielded Loop Coil

YAMAGUCHI M., YABUKAMI S., YURUGI H., ARAI K. I., MASUDA N., TAMAKI N., TOHYA H.

1999　594-595　1999/09/20
3D-Motion Capture System Using Magnetic Marker

YABUKAMI S., KIKUCHI H., YAMAGUCHI M., ARAI K. I., TAKAHASHI K., ITAGAKI A., WAKO N.

1999　(116)　77-82　1999/09/17
Development of Thin-Film Fully Automatic Permeameter Available in 1MHz-3GHz Range

MIYAZAWA Y., YABUKAMI S., WATANABE M., ITAGAKI A., ANDO H., YAMAGUCHI M., ARAI K. I., SATO T., YAMASAWA K., SASAKI Y., HATANAI T.

1999　(81)　57-62　1999/07/30
Magnetic near field detection using thin-film shielded loop coil

YURUGI Hiroyuki, YABUKAMI Shin, YAMAGUCHI Masahiro, ARAI Ken-Ichi, MASUDA Norio, TAMAKI Naoya, TOHYA Hirokazu

IEICE technical report. Electromagnetic compatibility　99　(240)　43-48　1999/07/29
Publisher: The Institute of Electronics, Information and Communication Engineers
ISSN：0913-5685

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This paper proposes a new miniature thin-film coil whose area is down to 25μm×110μm to sense magnetic near field from PCBs (Printed Circuit Boards) or ICs. The proposed coil has multi-layer planar shielded loop structure and it is insensitive to electric field. Spatial resolution of 300μm was obtained using the coil at 800MHz. This value is about 3 times better than the PCB-made type we have already presented. Magnetic field distribution near the LSI packaged on PCB has been demonstrated.
An Evaluation of Permeability for Striped Thin Films

YABUKAMI S., TAKEZAWA M., UO T., SYAHMI U. I., YAMAGUCHI M., ARAI K. I., MIYAZAWA Y., WATANABE M., ITAGAKI A., ANDO H.

1999　(36)　43-48　1999/05/25
シｰルディドルｰプコイルを用いた高分解能近傍磁界計測

藪上信

通信学会ソサイエティ大会, 1999　1999
Design and fabrication of micro shielded loop coil by thin film process

YURUGI H., YABUKAMI S., YAMAGUCHI M., ARAI K. I., MASUDA N., TAMAKI N., TOHYA H.

1998　(232)　19-24　1998/12/05
High frequency field measurements using a planar multilayer coil

YAMAGUCHI M., YABUKAMI S., ARAI K. I., ITAGAKI A., ANDO H., WATANABE M., SAITO N., ITAGAKI K., FUDA K., MASUDA N., TOHYA H.

22　154-a-154-b　1998/09/01
An Error Analysis of Thin Film Permeance Measurements

YABUKAMI S., YAMAGUCHI M., ARAI K. I., WATANABE M., ITAGAKI A., ANDO H.

22　291-291　1998/09/01
Planning of shielded loop coil using thin film process

YURUGI H., YABUKAMI S., YAMAGUCHI M., ARAI K. I., MASUDA N., TAMAKI N., TOHYA H.

22　284-284　1998/09/01
High Resolution and 2-Dimensional Electromagnetic Noise Imaging System

WATANABE M., ITAGAKI A., ITAGAKI K., SAITO N., TAMOGAMI T., FUDA K., SAKURADA Y., YABUKAMI S., YAMAGUCHI M., ARAI K. I.

22　27-27　1998/09/01
An Error Reduction and Calibration of Thin Film Permeance Measurements Using Shielded Loop Coil

YABUKAMI S., MOROOKA K., YAMAGUCHI M., ARAI K. I., WATANABE M., ITAGAKI A., ANDO H.

1998　(96)　31-36　1998/07/22
Tow-Dimensional Near Field Mapping System For Noise Evaluation of Switching Power Supplies

ITAGAKI A., WATANABE M., ITAGAKI K., SAITO N., TAMOGAMI T., FUDA K., SAKURADA Y., YABUKAMI S., YAMAGUCHI M., ARAI K. I.

Technical report of IEICE. Energy engineering in electronics and communications　98　(173)　43-50　1998/07/14
Publisher: The Institute of Electronics, Information and Communication Engineers

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We developed a 2-dimensional near-field electromagnetic noise mapping system. The magnetic field pickup coil is made of shielded loop type cross array coil. The array coil is swept by stepping moters. Minimum scanning step is 0.1mm. The result of mapping data was displayed by vector intensity and direction's bar. In this paper. We demonstrated a noise map of the loop antenna, microstrip line, computer board, and switching power supplies.
2-Dimensional and High Resolution Mapping for Electromagnetic Noise

Yamaguchi M, Yabukami S, Yurugi H, Arai K.I., Itagaki I, Itagaki K, Saito N, Fuda K, Watanabe M, Takahashi H, Tamogami T, Sakurada Y

Proceedings of the IEICE General Conference　1998　(1)　325-325　1998/03/06
Publisher: The Institute of Electronics, Information and Communication Engineers
4)多層プリント配線板を用いた平面形コイルによるHFUHF帯の電磁計測(無線・光伝送研究会)

薮上信, 山口正洋, 荒井賢一

映像情報メディア学会誌 : 映像情報メディア　52　(2)　164-164　1998/02/20
Publisher: 一般社団法人映像情報メディア学会
ISSN：1342-6907
多層平面コイルによる高周波電磁計測に関する研究

薮上信

東北大学博士論文　1998
Two-Dimensional High-Resolution Mapping System for Electromagnetic Noise

YAMAGUCHI M., YABUKAMI S., NAKADA K., ARAI K.I., ITAGAKI A., ITAGAKI K., SAITO N., FUDA K., WATANABE M., TAKAHASHI H., TAMOGAMI T., SAKURADA Y.

Journal of the Magnetics Society of Japan　22　(4)　849-851　1998
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.22.849 　

ISSN：0285-0192

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We developed a near-field magnetic noise mapping system by using a shielded-loop type coil array. High-resolution (0.1 mm) two-dimensional magnetic field vector detection was realized. We demonstrated a noise map of the loop antenna, microstrip line, and printed circuit board of a personal computer.
Two-Dimensional High-Resolution Mapping System for Electromagnetic Noise

YAMAGUCHI M., YABUKAMI S., NAKADA K., ARAI K.I., ITAGAKI A., ITAGAKI K., SAITO N., FUDA K., WATANABE M., TAKAHASHI H., TAMOGAMI T., SAKURADA Y.

Journal of the Magnetics Society of Japan　22　(4)　849-851　1998
Publisher: The Magnetics Society of Japan
DOI： 10.3379/jmsjmag.22.849 　

ISSN：0285-0192

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We developed a near-field magnetic noise mapping system by using a shielded-loop type coil array. High-resolution (0.1 mm) two-dimensional magnetic field vector detection was realized. We demonstrated a noise map of the loop antenna, microstrip line, and printed circuit board of a personal computer.
Two-Dimensional and High-Resolution Near Field Noise Mapping System

YAMAGUCHI M., YABUKAMI S., NAKADA K., ARAI K. I., ITAGAKI A., ITAGAKI K., SAITO N., FUDA K., WATANABE M., TAKAHASHI H., TAMOGAMI T., SAKURADA Y.

IEICE technical report. Microwaves　97　(342)　7-12　1997/10/27
Publisher: The Institute of Electronics, Information and Communication Engineers

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We developed near field noise mapping system by using shielded loop type coil array. High resolution (0.1mm) and Two-dimensional magnetic field vector detection can be realized. We demonstrated the noise map of Loop antenna, microstrip line and printed wiring board of personal computer.
2-Dimensional and High Resolution Mapping for Elctromagnetic Noise

YAMAGUCHI M., YABUKAMI S., NAKADA K., ARAI K. I., ITAGAKI I., ITAGAKI K., SAITO N., FUDA K., WATANABE M., TAKAHASHI H., TAMOGAMI T., SAKURADA Y.

21　105-105　1997/10/01
Thin Film Permeance Measurements up to 3.5GHz

YABUKAMI S., YAMAGUCHI M., ARAI K. I.

21　197-197　1997/10/01
2-Dimensional Near Field Electromagnetic Noise Mapping System Using of Planar Coil Array for Printed Circuit Boards

YAMAGUCHI M., YABUKAMI S., NAKATA K., ARAI K. I., ITAGAKI A., ITAGAKI K., SAITO N., FUDA K., WATANABE M., TAKAHASI H., TAMOGAMI K., SAKURADA Y.

1997　(126)　1-6　1997/07/18
A High Frequency Analysis of Thin Film Permeance Meter Using Time-Domain-Reflectometry

YABUKAMI S., YAMAGUCHI M., ARAI K. I.

1997　(111)　7-12　1997/07/17
A Measurement System of Electromagnetic Noise From Printed Wiring Boards Using Linearly Aligned Coil Array

YAMAGUCHI M., YABUKAMI S., NAKADA K., ARAI K. I., ITAGAKI A., ITAGAKI K., SAITO N., FUDA K., WATANABE M., SAKURADA Y.

1996　(216)　65-73　1996/12/06
A permeance measurement of soft magnetic thin-film in the 1MHz-2GHz range

YABUKAMI S., YAMAGUCHI M., ARAI K. I.

1996　(158)　45-54　1996/11/05
Permeance measurements using shielded loop pickup coil.

YABUKAMI S., YAMAGUCHI M., ARAI K. I.

20　374-374　1996/09/01
Principle of magnetic flux sensing for microstrip coil

YABUKAMI S., KIKUCHI K., YAMAGUCHI M., ARAI K.

20　373-373　1996/09/01
A measuremetns for electromagnetic noise using a coil array system

YABUKAMI S., WATANABE M., ITAGAKI A., NAKADA K., YAMAGUCHI M., ARAI K. I.

20　239-239　1996/09/01
Thin-Film Permeance Measurements Using Shielded Loop Pickup Coil in the 1MHz-1.5GHz Range

YABUKAMI S., YAMAGUCHI M., ARAI K. I.

1996　(91)　15-23　1996/07/13
Electromagnetic noise measurements near a printed circuit board using microstrip coil

YABUKAMI S., WATANABE M., ITAGAKI A., YAMAGUCHI M., ARAI K. I.

1996　(1)　19-27　1996/02/01
High frequency permeance measurements using microstrip coil

YABUKAMI S., KIKUCHI H., YAMAGUCHI M., ARAI K. I.

19　31-31　1995/09/01
Noise measurements for personal computer using microstrip coil

YABUKAMI S., WATANABE M., KIKUCHI K., YAMAGUCHI M., ARAI K. I.

19　162-162　1995/09/01
Electromagnetic noise measurements using microstrip coil

YABUKAMI S., WATANABE M., YAMAGUCHI M., ARAI K. I.

1995　(116)　75-82　1995/08/29
High Frequency Magnetic Field Sensing Using Microstrip Coil

YABUKAMI S., KIKUCHI H., YAMAGUCHI M., ARAI K. I.

1995　(73)　47-56　1995/06/16

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Books and Other Publications 12

電気学会技術報告第1510号オンチップRFマグネティックスの研究開発動向

薮上信

電気学会　2021/04/07
電気学会技術報告第1427号磁気利用センシングの最新動向

薮上信

電気学会　2018/08
High response Magnets for the next generation of colliders

Eiji Nakamura, Masakazu Takayama, Shin Yabukami, Yoshinori Ishi

2018
まぐね（Magnetics Japan）【初等連載講座】磁界センサとのその応用第1回磁界センサ概論

薮上信

日本磁気学会　2016/06
磁気便覧（磁界センサ、MI効果応用素子）

薮上信

丸善　2016/01
電気学会誌第136巻第1号 3. 高周波キャリア型薄膜センサ

薮上信

電気学会　2016/01
ウェットプロセスによる精密薄膜コーティング技術

薮上信

技術情報協会　2014/08
電気学会技術報告第1313号高周波マイクロ磁気応用技術の最新動向

薮上信

電気学会　2014/07
電気学会技術報告高周波マイクロ磁気応用技術の最新動向

薮上信

電気学会　2014
薄膜の評価技術ハンドブック透磁率

薮上信

株式会社テクノシステム　2013/01
電気学会技術報告第1260号磁気の医療応用研究の動向

薮上信

電気学会　2012/09
電気学会技術報告第1228号ナノ構造磁性体-形成・評価・応用-

薮上信

電気学会　2011/07

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Presentations 271

Dumbbell-like Au–Fe3O4 Nanoparticles for Magnetic Hyperthermia

Loi Tontha, Tomoyuki Ogawa, Shin Yabukami

The 68th Annual Conference on Magnetism and Magnetic Materials　2023/11/02
Ferromagnetic Resonance-based Heat Dissipation in Dumbbell-like Au–Fe3O4 Nanoparticles

Loi Tontha, Akihiro Kuwahata, Shin Yabukami

The 68th Annual Conference on Magnetism and Magnetic Materials　2023/11/01
Enhancing Leaked Magnetic Field Measurement with in Film Magnetic Field Sensor

Loi Tontha, 鈴木椋太, 本多順一, 沖田和彦, J. Chakarothai, 藤井勝巳, 薮上信

2023/09/29
磁性ナノ粒子の応答性を利用したタンパク質検出

金子晃基, 村山徹, 本多順一, Loi Tontha, 沖田和彦, 薮上信

第47回日本磁気学会学術講演会　2023/09/27
磁気渦構造を持つ中空構造Fe3O4粒子の磁気加熱特性

秋山遥, Loi Tontha, 桑波田晃弘, 薮上信, 小林悟

第47回日本磁気学会学術講演会　2023/09/27
Non-invasive treatment of lymph node metastasis with magnetic hyperthermia technology in murine tumor model

Takayuki Kagami, Ariunbuyan Sukhbaatar, Akihiro Kuwahata, Loi Tontha, Riku Shinohara, Shin Yabukami, Tetsuya Kodama

The 82nd Annual Meeting of the Japanese Cancer Association　2023/09/23
がんの低侵襲磁気温熱治療のための磁気コイル形状の検討

山崎葵生, 鏡味隆行, 薮上信, 桑波田晃弘

生体医工学シンポジウム2023　2023/09/09
磁気加熱中の磁性ナノ粒子Resovistのワイヤレス温度計測

篠原陸, 鏡味隆行, 薮上信, 桑波田晃弘

2023年度電気関係学会東北支部連合大会　2023/09/06
高い磁場一様性を実現する最適化小型磁石形状の評価

田中治樹, 村田祐眞, 薮上信, 桑波田晃弘

023年度電気関係東北支部連合大会　2023/09/06
磁気ハイパーサーミアにおける磁場分布と磁性ナノ粒子の温度分布評価

鏡味隆行, 薮上信, 桑波田晃弘

2023年度電気関係学会東北支部連合大会　2023/09/06
Optimization of High Frequency Permeability of Thick Magnetic Material Invited

S. Yabukami

The 6th International Conference of Asian Union of Magnetics Societies　2023/08/14
高周波駆動薄膜磁界センサの開発とバイオ計測応用 Invited

薮上信

日本磁気学会バイオマグネティックス専門研究会　2023/03/29
磁気工学と高周波技術のヘルスケアサービスへの応用 Invited

薮上信

スマートエイジング(SA)カレッジ　2023/03/22
高周波駆動薄膜磁界センサの開発とバイオ応用 Invited

薮上信

応用物理学会春季学術講演会シンポジウム　2023/03/18
厚膜磁性体の透磁率測定に関する反磁界の補正

益子朝日, 坂本雅弥, 渡辺佳是, 沖田和彦, 薮上信

電気学会　2023/01/20
Method of Measuring Magnetic Susceptibility of Magnetic Nanoparticles up to 67 GHz

2023/01/20
磁性ナノ粒子を利用した新しい抗原検出方法 Invited

薮上信

科学技術振興機構新技術説明会　2022/12/22
マイクロストリップ型プローブによる広帯域、高感度透磁率および誘電率評価装置の開発 Invited

薮上信

第8回岩崎コンファレンス　2022/12/06
Method for Measuring Magnetic Susceptibility of Magnetic Nanoparticles up to Millimeter-Wave Frequency Range

Youcheng Pu, Loi Tontha, Toru Murayama, Kazuhiko Okita, Shin Yabukami

67th Annual Conference on Magnetism and Magnetic Materials　2022/11/07
Development of a compact magnet for applying a highly uniform magnetic field to a diamond magnetic sensor by inverse problem analysis

Haruki Tanaka, Yuma Murata, Shin Yabukami, Akihiro Kuwahata

67th Annual Conference on Magnetism and Magnetic Materials　2022/11/03
Rapid Virus Detection using Magnetic Second Harmonics of Superparamagnetic Iron Oxide Nanoparticles

R. Hirota, Toru Murayama, Ryota Katsumi, Tokuhisa Kawawaki, Shin Yabukami, Ryuji Igarashi, Yuichi Negishi, Moriaki Kusakabe, Masaki Sekino, Takashi Yatsui, Akihiro Kuwahata

67th Annual Conference on Magnetism and Magnetic Materials　2022/11/01
Synthesis and antigen-antibody reaction of ultrasmall FeCo nanoparticles

Loi Ton Tha, Toru Murayama, Nobukiyo Kobayashi, Shin Yabukami, Wakako Ikeda-Ohtsubo, Ken Ichi Arai

67th Annual Conference on Magnetism and Magnetic Materials　2022/11/01
Development of gold-coated magnetic nanoparticles as a theranostic agent for magnetic hyperthermia and micro-CT imaging applications

Loi Ton Tha, Mone Kimura, Tomoyuki Ogawa, Narufumi Kitamura, Yoshio Kobayashi, Kohsuke Gonda, Shin Yabukami

67th Annual Conference on Magnetism and Magnetic Materials　2022/11/01
Development of magnetic nanoparticles for biomedical applications

Loi Tontha, Tomoyuki Ogawa, Shin Yabukami

2022/09/14
磁性ナノ粒子凝集体を用いた迅速な細菌検出方法

蒲宥丞, 村山徹, トンタットロイ, 沖田和彦, 渡辺佳是, 薮上信

日本磁気学会学術講演会
高周波パルス磁界印加による磁性粒子の加熱

安達友威, 桑波田晃弘, 薮上信, 中村英滋

日本磁気学会学術講演会
高周波駆動薄膜磁界センサの開発 Invited

薮上信

日本磁気学会学術講演会シンポジウム　2022/09/02
高周波駆動薄膜センサにおける磁性薄膜スリットの最適幅に関する検討

坂本雅弥, 鈴木椋太, 石原知弥, 本多順一, 薮上信

日本磁気学会学術講演会　2022/09
スリットを有するマイクロストリップ型プローブによる透磁率評価

渡辺佳是, 益子朝日, 坂本雅也, 沖田和彦, 薮上信

日本磁気学会学術講演会　2022/09
磁性ナノ粒子の第二次高調波を利用したウイルス検出

廣田竜一, 村山徹, 勝見亮太, 川脇徳久, 薮上信, 五十嵐龍治, 根岸雄一, 日下部守昭, 関野正樹, 八井崇, 桑波田晃弘

2022年度電気関係学会東北支部連合大会
Wide Microstrip Line Type Probe with Slits and Permeability Evaluation of Thick Magnetic Material

S. Yabukami, M. Sakamoto, A. Mashiko, Y. Watanabe, K. Sakuma, K. Okita

The XIII European Magnetic Sensors and Actuators Conference (EMSA 2022)　2022/07/04
磁性薄膜スリットによる高周波駆動薄膜センサのインピーダンス整合に関する検討

坂本雅弥, 鈴木椋太, 石原知弥, 本多順一, 薮上信

電気学会マグネティックス/リニアドライブ合同研究会　2022/06/02
スリットを有するマイクロストリップ型プローブによる透磁率評価

渡辺佳是, 益子朝日, 坂本雅也, 佐久間勝美, 沖田和彦, 薮上信

電気学会マグネティックス/リニアドライブ合同研究会　2022/06/02
マイクロストリップ型プローブを用いた高周波透磁率・誘電率評価 Invited

薮上信

第205回スピニクス研究会　2022/03/28
逆問題的アプローチによる磁場空間一様性の高い永久磁石形状の最適化

田中治樹, 村田祐眞, 薮上信, 桑波田晃弘

令和４年電気学会全国大会　2022/03/23
磁気ナノ粒子を用いたバイオ医療計測と応用 Invited

薮上信

日本磁気学会第234回研究会　2021/11/22
磁性ナノ粒子の第二次高調波を利用したウイルス検出

廣田竜一, 村山徹, 勝見亮太, 川脇徳久, 薮上信, 五十嵐龍治, 根岸雄一, 日下部守昭, 関野正樹, 八井崇, 桑波田晃弘

令和３年度スピ二クス特別研究会　2021/10/27
生体内における磁気温熱療法の定温加熱制御

鹿野晃弘, トンタットロイ, 桑波田晃弘, アリウンブヤンスフバートル, 小玉哲也, 薮上信

令和３年度スピ二クス特別研究会　2021/10/27
2 次元イメージングのための光ファイバアレイを用いたダイヤモンド窒素-空孔中心による磁気観測

村田祐眞, 田中治樹, 荒井慧悟, 勝見亮太, 増山雄太, 岩﨑孝之, 波多野睦子, 五十嵐龍治, 大島武, Fedor Jelezko, 日下部守昭, 薮上信, 八井崇, 関野正樹, 桑波田晃弘

令和３年度スピ二クス特別研究会　2021/10/26
2 次元イメージングのための光ファイバアレイを用いたダイヤモンド窒素-空孔中心による磁気観測

村田祐眞, 田中治樹, 荒井慧悟, 勝見亮太, 増山雄太, 岩﨑孝之, 波多野睦子, 五十嵐龍治, 大島武, Fedor Jelezko, 日下部守昭, 薮上信, 八井崇, 関野正樹, 桑波田晃弘

令和３年度スピ二クス特別研究会　2021/10/26
A correction of measurement for complex magnetic permeability by direct contact probe

Z Wang,T Ishihara, K Okita,S Yabukami

2021/10/26
コプレーナ型薄膜磁界センサの電磁界解析

石原知弥, 植竹宏明, 岩崎千里, 薮上信, 山口正洋

第45回日本磁気学会学術講演会　2021/09/01
マイクロストリップ型プローブにおける測定誤差の検討

髙木薫, 石原知弥, 沖田和彦, 岩崎千里, 薮上信, 山口正洋, 茶谷健一

第45回日本磁気学会学術講演会　2021/09/01
スイッチ磁界に対する磁性ナノ粒子の応答性を利用した多菌種検出

高橋隼之介, 小野寺英彦, 村山徹, トンタットロイ, 沖田和彦, 桑波田晃弘, 薮上信, 大坪和香子, 横田琴音, 古谷真衣子, 金高弘恭, 三浦由則, 高橋英樹

第45回日本磁気学会学術講演会　2021/09/01
スイッチ磁界に対する磁性ナノ粒子の応答性を利用した多菌種検出

高橋隼之介, 小野寺英彦, 村山徹, トンタットロイ, 沖田和彦, 桑波田晃弘, 薮上信, 大坪和香子, 横田琴音, 古谷真衣子, 金高弘恭, 三浦由則, 高橋英樹

第45回日本磁気学会学術講演会　2021/09/01
マイクロストリップ型プローブにおける測定誤差の検討

髙木薫, 石原知弥, 沖田和彦, 岩崎千里, 薮上信, 山口正洋, 茶谷健一

第45回日本磁気学会学術講演会　2021/09/01
抗体を直接吸着させた磁性ナノ粒子の抗原抗体反応の評価

米山毅, 村山徹, トンタットロイ, 桑波田晃弘, 薮上信, 佐藤佑哉, 寺村裕治, 大坪和香子, 小川智之

第45回日本磁気学会学術講演会　2021/09/01
コプレーナ型薄膜磁界センサの電磁界解析

石原知弥, 植竹宏明, 岩崎千里, 薮上信, 山口正洋

第45回日本磁気学会学術講演会　2021/09/01
磁気ハイパーサーミア用 PID 加熱制御システムの開発

鹿野晃弘, トンタットロイ, 桑波田晃弘, 薮上信

第45回日本磁気学会講演会　2021/08/31
磁気ハイパーサーミア用 PID 加熱制御システムの開発

鹿野晃弘, トンタットロイ, 桑波田晃弘, 薮上信

第45回日本磁気学会講演会　2021/08/31
磁気温熱療法における感温磁性微粒子のワイヤレス温度検知技術の評価

北村大河, 鹿野晃弘, トンタットロイ, 桑波田晃弘, 薮上信

2021年度電気関係学会東北支部連合大会　2021/08/26
磁気温熱療法における感温磁性微;粒子のワイヤレス温度検知技術の評価

北村大河, 鹿野晃弘, トンタットロイ, 桑波田晃弘, 薮上信

2021年度電気関係学会東北支部連合大会　2021/08/26
通電プローブを用いた磁性薄膜の複素透磁率測定

王子元, 石原知弥, 沖田和彦, 岩崎千里, 薮上信

マグネティックス/リニアドライブ合同研究会　2021/06/24
通電プローブを用いた磁性薄膜の複素透磁率;測定

王子元, 石原知弥, 沖田和彦, 岩崎千里, 薮上信

マグネティックス/リニアドライブ合同研究会　2021/06/24
Simultaneous Evaluation of Permeability and Permittivity using a Flexible Microstrip Line-Type Probe up to 67 GHz

S. Yabukami, C.Iwasaki, K.Nozawa, S.Takahashi, K.Okita, M. Sato, S. Sugimoto, K.Chatani

The International Magnetics Conference 2021 (INTERMAG 2021)　2021/04/28
コプレーナ型薄膜磁界センサの電磁界解析

石原知弥, 植竹宏明, 岩崎千里, 薮上信, 山口正洋

電気学会全国大会　2021/03/10
高感度磁気バイオセンシング Invited

薮上信

電気学会全国大会シンポジウム　2021/03/09
A Constant Temperature Control Technology for Hyperthermia Therapy using Magnetic Particles

2021/01/23
磁気温熱療法のための発熱体とその温度および位置の検出技術の開発

Loi Tonthat, Kazutaka Mitobe, Shin Yabukami

日本磁気学会学術講演会　2020/12/15
マイクロストリップ線路型プローブによる透磁率・誘電率の同時測定

能澤昂平, 高橋翔平, 沖田和彦, トンタットロイ, 薮上信, 佐藤光晴, 杉本諭

日本磁気学会学術講演会　2020/12/14
Simultaneous Measurement of Permeability and Permittivity using a Flexible Microstrip Line-Type Probe up to 67 GHz

S. Yabukami, K. Nozawa, L.Tonthat, K.Okita, M. Sato, S. Sugimoto

The Annual Conference of Magnetic Materials and Magnetism 2020　2020/11/04
Effect of applied magnetic field on permeability and heating efficiency of multifunctional micro/nano-magnetic particles for hyperthermia therapy

Loi Tonthat, Yoshiyuki Yamamoto, Kazutaka Mitobe, Shin Yabukami

The 65th Annual Conference on Magnetism and Magnetic Materials (MMM 2020)　2020/11/04
Development of elemental technologies for magnetic hyperthermia in cancer treatment

Loi Tonthat, Fumitaka Aki, Kazutaka Mitobe, Shin Yabukami, Yoshiyuki Yamamoto

The 11th Asian Pacific Conference on Medical and Biological Engineering (APCMBE 2020)　2020/05/27
An automatic localization system of magnetic particles for hyperthermia in cancer treatment

Loi Tonthat, Kazutaka Mitobe, Shin Yabukami

The International Magnetics Conference 2020 (INTERMAG 2020)　2020/05/08
Impact of complex permeability measurements up to millimeter-wave frequency range

S. Yabukami, K. Nozawa, L.Tonthat, K.Okita

The International Magnetics Conference 2020　2020/05
スイッチ磁界に対する磁性ナノ粒子の応答性を利用した細菌検出

高橋隼之介, トンタットロイ, 小野寺英彦, 沖田和彦, 藪上信, 横田琴音, 古谷真衣子, 金高弘恭, 三浦由則, 髙橋英樹, 渡部芳彦, 秋山利津子

電気学会マグネティクス研究会　2019/12/27
磁気センサの高機能とシステム化調査専門委員会の活動目的と活動概要 Invited

薮上信

電子情報技術産業協会テープストレージ専門委員会　2019/12/13
マイクロストリッププローブによる磁性薄膜の高周波透磁率測定

能澤昂平, 沖田和彦, トンタットロイ, 薮上信, 遠藤恭, 島田寛, 斉藤伸, 内海良一

マグネティックス研究会2019（大阪大学，大阪）　2019/12/05
A Simple and Rapid Detection System of Oral Bacteria in Liquid Phase for Point-of-Care Diagnostics using Magnetic Beads

Loi Ton That, Shunnosuke Takahashi, Hidehiko Onodera, Kazuhiko Okita, Shin Yabukami, Kotone Yokota, Maiko Furuya, Hiroyasu kanetaka, Yoshinori Miura, Hideki Takahashi

2019 Annual Conference on Magnetism and Magnetic Materials (Las Vegas, America)　2019/11/06
Very Broad Bandwidth Permeability Measurement of Thin Film using a Flexible Microstrip Line-type Probe up to 67 GHz

Kouhei Nozawa, Loi Tonthat, Kazuhiko Okita, Shin Yabukami, Yasushi Endo, Yutaka Shimada, Shin Saito, Ryoichi Utsumi

2019 Annual Conference on Magnetism and Magnetic Materials (Las Vegas, America)　2019/11/07
A Highly Sensitive Coplanar Line Thin Film Sensor for Magnetocardiographic Measurement

Haruhi Kudo, Heroaki Uetake, Hidehiko Onodera, Loi Tonthat, Shin Yabukami, Junichi Hayasaka, Ken Ichi Arai

2019 Annual Conference on Magnetism and Magnetic Materials (Las Vegas, America)　2019/11/06
がん磁気温熱療法のための感温磁性マイクロ・ナノ微粒子の開発

トンタットロイ, 水戸部一孝, 薮上信

令和元年度スピニクス特別研究会（日本大学，福島）　2019/10/15
スイッチ磁界に対する磁性ナノ粒子の緩和を利用した細菌検出

高橋隼之介, トンタットロイ, 小野寺英彦, 沖田和彦, 薮上信, 横田琴音, 古谷真衣子, 金高弘恭, 三浦由則, 高橋英樹, 渡部芳彦, 秋山利津子

令和元年度スピニクス特別研究会（日本大学，福島）　2019/10/15
スイッチ磁界に対する磁性ナノ粒子の応答性を利用した細菌検出

高橋隼之介, トンタットロイ, 小野寺英彦, 沖田和彦, 薮上信, 横田琴音, 古谷真衣子, 金高弘恭, 三浦由則, 高橋英樹

第43 回日本磁気学会学術講演会（京都，日本）　2019/09/25
フレキシブルマイクロストリップ線路型プローブによる磁性薄膜の67 GHzまでの高周波透磁率測定

能澤昂平, トンタットロイ, 薮上信, 斉藤伸, 遠藤恭, 島田寛

第43 回日本磁気学会学術講演会（京都，日本）　2019/09/25
フリップチップボンディングによる高周波駆動薄膜磁界センサ

工藤春陽, 植竹宏明, 小野寺英彦, トンタットロイ, 薮上信, 早坂淳一, 荒井賢一

第43 回日本磁気学会学術講演会（京都，日本）　2019/09/25
Au コートFe2O3 粒子の交流磁化特性と発熱特性

山南豪, 小林昌太, Tonthat Loi, 水戸部一孝, 薮上信, 山田努, 大多哲史, 竹村泰司

第43 回日本磁気学会学術講演会（京都，日本）　2019/09/25
がん磁気温熱療法のための磁性微粒子の位置および温度のワイヤレス検知技術

トンタットロイ, 水戸部一孝, 薮上信

第200回スピニクス研究会（東北，日本）　2019/09/04
磁性ナノ粒子の磁気応答を利用した細菌検出とヘルスケアへの応用 Invited

薮上信

第６回岩崎コンファレンス「磁気技術が拓くIoTエコシステム～Quality of Societyのさらなる進展に向けて～」　2019/06/11
磁気ハイパーサーミアのための感温磁性微粒子の位置・温度情報のワイヤレス検知技術に関する研究開発

TON THAT LOI, 安藝史崇, 山本良之, 齊藤元, 薮上信, 水戸部一孝

第58回日本生体医工学会大会　2019/06/07
金コート感温磁性体を利用したハイパーサーミアのためのワイヤレス温度計測・自動定温加熱システムの構築

安藝史崇, TON THAT LOI, 齊藤元, 山崎清之, 水戸部一孝

第58回日本生体医工学会大会　2019/06/07
ハイパーサーミア用ワイヤレス温度検知技術のための磁場印加検知ユニットの検討

山本裕和, TON THAT LOI, 安藝史崇, 水戸部一孝

第58回日本生体医工学会大会　2019/06/06
磁気センサに関する動向と今後 Invited

薮上信

電気学会全国大会　2019/03/14
Evaluation of bacteria using switching magnetic field

S. Yabukami, H. Onodera, Y. Sato, K. Miyauchi, G. Endo, M. Fukuya, H. Kanetaka, Y. Miura, H. Takahashi, T. Kodama

2019 Joint MMM-Intermag Conference　2019/01/15
フリップチップボンディングによる高周波駆動薄膜磁界センサモジュール

工藤春陽, 植竹宏明, 小野寺英彦, 薮上信, 早坂淳一, 荒井賢一

電気学会マグネティクス研究会　2018/12/21
フリップチップボンディングによる高周波駆動薄膜磁界センサ

工藤春陽, 植竹宏明, 小野寺英彦, 薮上信, 早坂淳一, 荒井賢一

スピニクス特別研究会　2018/11/15
Evaluation of bacteria using switching magnetic field

S. Yabukami, H. Onodera, Y. Sato, K. Miyauchi, G. Endo, M. Fukuya, H. Kanetaka, Y. Miura, H. Takahashi, T. Kodama

The Third Internationl Workshop on Magnetic BioSensing　2018/11/06
High - Frequency Carrier - Type Thin Film Sensor International-presentation Invited

YABUKAMI Shin

Proceedings of The Biomagnetic Sendai 2017 Satellite symposium, (2017)　2017/05/22
高周波伝送線路型プローブによる磁性薄膜の磁気ひずみ計測法の開発

薮上信

平成29年電気学会全国大会　2017/03/17
FeCo-MgFナノグラニュラー薄膜の高周波誘電特性

薮上信

平成29年電気学会全国大会　2017/03/17
バイアス通電によるミアンダコプレーナ薄膜磁界センサ

薮上信

平成29年電気学会全国大会　2017/03/15
BaおよびSr系六方晶フェライト材料の高周波特性

薮上信

マグネティックス研究会　2016/12/09
磁性薄膜の強磁性共鳴と応力の評価

薮上信

マグネティックス研究会　2016/12/09
LC共振型磁気マーカを用いたワイヤレス位置検出システムの励磁方法に関する検討

薮上信

マグネティックス研究会　2016/12/09
マイクロストリップ型プローブによる薄膜透磁率評価

薮上信

平成28年度スピニクス特別研究会　2016/11/21
低周波領域における薄膜MI素子の磁壁移動に伴う特性変化とその解析

薮上信

マグネティックス研究会　2016/09/20
バイアス通電によるミアンダコプレーナ線路薄膜センサの開発

薮上信

マグネティックス研究会　2016/09/20
複数の励磁コイルの適用による位置検出システムの検出性能改善

薮上信

第40回日本磁気学会学術講演会　2016/09/06
バイアス通電によるミアンダコプレーナ線路型薄膜センサ素子

薮上信

第40回日本磁気学会学術講演会　2016/09/06
磁壁共鳴を利用したMHz帯域での直接通電型薄膜磁気インピーダンスセンサの可能性

薮上信

第40回日本磁気学会学術講演会　2016/09/06
磁性薄膜の応力と強磁性共鳴の評価

薮上信

第40回日本磁気学会学術講演会　2016/09/06
Co- and Ti-substituted M-type hexaferrites for high frequency applications

YABUKAMI Shin

2016/09/06
バイアス通電によるミアンダコプレーナ線路型薄膜センサの開発

薮上信

平成28年度電気関係学会東北支部連合会　2016/08/31
磁気センサ、生体計測の基礎（非常勤講師）

薮上信

仙台高等専門学校電気システム工学科５年特別講義　2016/07/15
高周波磁気計測、磁気センサ（非常勤講師）

薮上信

名古屋大学大学院電子情報システム特別講義　2016/06/08
高周波駆動薄膜磁界センサの開発と生体磁気計測への応用

薮上信

第７回磁気センサの高機能化と応用調査専門委員会　2016/05/26
磁気センサ用アモルファスワイヤの動的磁化過程の解析 Invited

薮上信

第58回スピンエレクトロニクス専門研究会（第3回超高感度マイクロ磁気センサ専門研究会）　2016/03/29
高周波駆動薄膜磁界センサの開発 Invited

薮上信

第58回スピンエレクトロニクス専門研究会（第3回超高感度マイクロ磁気センサ専門研究会）　2016/03/29
High frequency magnetic measurement and magnetic field sensor International-presentation Invited

YABUKAMI Shin

Indian Institute of Science (IISc) Seminar　2016
マイクロストリッププローブによる薄膜透磁率計測

薮上信

マグネティックス研究会　2015/11/27
Investigation of Co- and Tisubstituted Sr-based M-type hexaferrite for the applications in X-band devices

YABUKAMI Shin

2015/11/26
ミアンダコプレーナ線路型薄膜磁界センサの開発

薮上信

マグネティックス研究会　2015/09/25
反磁界分布に基づく磁性薄膜高周波インピーダンス解析と素子小型化の検討

薮上信

マグネティックス研究会　2015/09/25
伝送線路構造の薄膜磁界センサによる心磁界計測

薮上信

平成27年電気学会基礎・材料・共通部門大会　2015/09/17
マイクロストリップ型プローブによる極薄膜透磁率評価

薮上信

第39回日本磁気学会学術講演会　2015/09/09
反磁界分布制御による磁性薄膜磁気センサの小型・高感度化に関する検討

薮上信

第39回日本磁気学会学術講演会　2015/09/09
ミアンダコプレーナ線路構造の薄膜磁界センサ素子

薮上信

第39回日本磁気学会学術講演会　2015/09/08
手作業時の手指運動計測を想定したモーションキャプチャシステム

薮上信

第39回日本磁気学会学術講演会　2015/09/08
FPGAを用いたワイヤレス磁気マーカ高速位置検出システム

薮上信

平成27年度電気関係学会東北支部連合会　2015/08/27
軟磁性アモルファス合金ナノワイヤー磁気特性評価 Invited

薮上信

日本磁気学会第1回超高感度磁気マイクロ磁気センサ専門研究会　2015/06/26
マイクロストリップ型プローブによる極薄膜透磁率計測

薮上信

平成27年電気学会全国大会　2015/03/26
伝送線路型薄膜磁界センサの開発と心磁界計測への応用 Invited

薮上信

第169回スピニクス研究会　2015/03/19
FPGAを用いた磁気マーカの位置検出システム

薮上信

電気学会マグネティックス研究会　2015/03/09
Highly sensitive thin film magnetic field sensor meandering coplanar line International-presentation

YABUKAMI Shin

Proceedings of The IEEE International Magnetics Conference (INTERMAG 2015)　2015
Development of Phase Detection Type Magnetic Field Sensor International-presentation

YABUKAMI Shin

Proceedings of The International Conference on Electrical Engineering (2015 ICEE)　2015
SrTiO 薄膜を用いた伝送線路型薄膜磁界センサ素子の試作

薮上信

第38回日本磁気学会学術講演会　2014/09/05
FPGA を用いた磁気マーカ高速位置検出システムの試作

薮上信

第38回日本磁気学会学術講演会　2014/09/03
マイクロストリップ型プローブによる極薄膜透磁率計測

薮上信

第38回日本磁気学会学術講演会　2014/09/03
Nano-Granular In Gap Magnetic Sensor を使用した厚さ測定

薮上信

第38回日本磁気学会学術講演会　2014/09/02
SrTiO薄膜を用いた高感度な伝送線路型薄膜磁界センサ素子の開発

薮上信

平成26年度電気関係学会東北支部連合大会　2014/08/21
FPGAを用いたワイヤレス磁気マーカ高速位置検出システム

薮上信

平成26年度電気関係学会東北支部連合大会　2014/08/21
SrTiO薄膜を用いた伝送線路型薄膜磁界センサの開発

薮上信

電気学会マグネティックス研究会　2014/08/08
FPGAを用いた高速磁気マーカ位置検出システムの試作

薮上信

電気学会マグネティックス研究会　2014/07/31
直線マイクロストリッププローブによる薄膜透磁率計測

薮上信

平成26年電気学会全国大会　2014/03/19
Permeability Measurements of Magnetic Thin Film using Skin Effect International-presentation Invited

YABUKAMI Shin

Proceedings of The 2014 IEEE International Conference on Microwave Magnetics (2014 IEEE ICMM)　2014
Preparation of Co-Ce-O composite films on polyimide films by the metal-oxide co-electroless deposition method International-presentation

YABUKAMI Shin

Proceedings of The IEEE International Magnetics Conference (INTERMAG EUROPE 2014)　2014
Highly sensitive coplanar line type integrated magnetic field sensor module International-presentation

YABUKAMI Shin

Proceedings of The IEEE International Magnetics Conference (INTERMAG EUROPE 2014)　2014
オンチップRF磁気デバイスの調査～センサ2（生体関係）～

薮上信

電気学会マグネティックス研究会　2013/12/19
直線マイクロストリップ型プローブによる薄膜透磁率計測

薮上信

第37回日本磁気学会学術講演会　2013/09/06
誘電体薄膜によるコプレーナ型薄膜磁界センサの高感度化

薮上信

第37回日本磁気学会学術講演会　2013/09/06
Nano-Granular In Gap Magnetic Sensorを使用した渦電流探傷

薮上信

第37回日本磁気学会学術講演会　2013/09/05
細長磁性リボンマーカによる位置検出システム

薮上信

第37回日本磁気学会学術講演会　2013/09/05
薄膜磁界センサによるシールドルーム外での心磁界計測

薮上信

第37回日本磁気学会学術講演会　2013/09/03
直線マイクロストリッププローブによる薄膜透磁率計測

薮上信

マグネティックス研究会　2013/08/08
伝送線路型薄膜磁界センサによるシールドルーム外での心磁界計測

薮上信

電気学会マグネティックスリニアドライブ合同研究会　2013/06/21
誘電体薄膜を用いた伝送線路型薄膜磁界センサの高感度化

薮上信

電気学会マグネティックス研究会　2013/06/14
表皮効果を利用した磁性薄膜透磁率測定用平面型プローブ

薮上信

第27回エレクトロニクス実装学会春季講演大会　2013/03/13
極細マーカを用いた位置検出システム

薮上信

電気学会マグネティックス研究会　2013/02/28
伝送線路型薄膜磁界センサによる心磁界の多点計測

薮上信

電気学会マグネティックス医用・生体工学合同研究会　2012/11/16
磁界センサを用いた渦電流探傷

薮上信

電気学会マグネティックス研究会　2012/09/24
コプレーナ線路を用いた高感度薄膜磁界センサの開発

薮上信

電気学会マグネティックス研究会　2012/09/24
磁性リボンを用いた位置検出システムの評価

薮上信

平成24年電気学会基礎・材料・共通部門大会　2012/09/21
マイクロストリッププローブによる表皮効果を利用した薄膜透磁率計測

薮上信

電気学会マグネティックス研究会　2012/06/22
伝送線路型薄膜磁界センサの高感度化と応用 Invited

薮上信

電気学会全国大会　2012/03/21
位相検出による超高感度磁界センサの開発状況 Invited

薮上信

超小型スピントロセンサの医療応用検討研究会　2012/03/06
医療技術における磁気応用研究の動向(3) 生体計測用センサにおける磁気応用技術

薮上信

マグネティックスリニアドライブ合同研究会　2012/02/22
医療技術における磁気応用研究の動向(5) 生体内へのエネルギー・信号伝達の磁気応用技術

薮上信

マグネティックスリニアドライブ合同研究会　2012/02/22
A Permeability evaluation of large magnetic thin film using meander type probe up to 20 GHz International-presentation

YABUKAMI Shin

Proceedings of The 2nd International Conference of AUMS and The 36th Annual Conference on Magnetics in Japan (ICAUMS 2012)　2012
Position sensing system using wireless ribbon type marker International-presentation

YABUKAMI Shin

Proceedings of The 2nd International Conference of AUMS and The 36th Annual Conference on Magnetics in Japan (ICAUMS 2012)　2012
Study of wireless position sensing system for diagnosis of a stent graft's shift International-presentation

YABUKAMI Shin

Proceedings of The 2nd International Conference of AUMS and The 36th Annual Conference on Magnetics in Japan (ICAUMS 2012)　2012
Non-Destructive Inspection Method Using GIGS Magnetic Field Sensor International-presentation

YABUKAMI Shin

Proceedings of The 2nd International Conference of AUMS and The 36th Annual Conference on Magnetics in Japan (ICAUMS 2012)　2012
Highly sensitive coplanar line type integrated magnetic field sensor International-presentation

YABUKAMI Shin

Proceedings of The 2nd International Conference of AUMS and The 36th Annual Conference on Magnetics in Japan (ICAUMS 2012)　2012
Wireless magnetic position sensing system composed of multi channels digitizer for realtime monitoring International-presentation

YABUKAMI Shin

Proceedings of The 9th European Magnetic Sensors & Actuators Conference (EMSA 2012)　2012
Transmission line type thin film sensor and measurement of MCG International-presentation

YABUKAMI Shin

Proceedings of The 9th European Magnetic Sensors & Actuators Conference (EMSA 2012)　2012
コプレーナ線路を用いた伝送線路型薄膜磁界センサの高感度化

薮上信

電気学会マグネティックス研究会　2011/11/24
ミアンダ形プローブを用いた10.8 GHzまでの磁性薄膜透磁率計測

薮上信

第35回日本磁気学会学術講演会　2011/09/28
コプレーナ線路を用いた薄膜磁界センサの高感度化

薮上信

第35回日本磁気学会学術講演会　2011/09/27
磁性リボンを用いた位置検出システム

薮上信

第35回日本磁気学会学術講演会　2011/09/27
高速AD コンバータを用いたワイヤレス磁気マーカの位置検出システム

薮上信

第35回日本磁気学会学術講演会　2011/09/27
高周波キャリア型薄膜磁界センサによる磁気探傷試験装置の試み

薮上信

第35回日本磁気学会学術講演会　2011/09/27
磁性リボンを用いた位置検出システムの開発

薮上信

電気学会マグネティックス研究会　2011/09/20
ミアンダ形プローブによる10.8GHzまでの磁性薄膜の透磁率評価

薮上信

電気関係学会東北支部連合大会　2011/08/25
磁性リボンを用いた位置検出システムの検討

薮上信

電気関係学会東北支部連合大会　2011/08/25
高周波キャリア型薄膜磁界センサを利用した磁気探傷の試み

薮上信

電気関係学会東北支部連合大会　2011/08/25
ミアンダ形プローブを用いた10.6GHzまでの薄膜透磁率計測

薮上信

電気学会マグネティックス研究会　2011/08/03
ミアンダ形プローブを用いた磁性薄膜の透磁率分布計測

薮上信

平成23年電気学会全国大会　2011/03/16
TRANSMISSION LINE TYPE THIN FILM SENSOR AND ITS BIOMAGNETIC APPLICATION International-presentation Invited

YABUKAMI Shin

Proceedings of The Moscow International Symposium on Magnetism (MISM 2011)　2011
Wireless magnetic position sensing system using optimized pick-up coils for high accuracy International-presentation

YABUKAMI Shin

Proceedings of The ASIA International Magnetics Conference (INTERMAG TAIPEI 2011)　2011
A permeability evaluation of large magnetic thin film using meander type probe up to 8.5 GHz International-presentation

YABUKAMI Shin

Proceedings of The ASIA International Magnetics Conference (INTERMAG TAIPEI 2011)　2011
ミアンダ形プローブによる磁性薄膜の透磁率分布の評価

薮上信

電気学会マグネティックス研究会　2010/12/17
伝送線路型薄膜磁界センサの試作

薮上信

電気学会マグネティックス研究会　2010/12/17
室温で動作する高感度薄膜磁界センサ Invited

薮上信

日本学術振興会アモルファス・ナノ材料第147委員会第110回研究会　2010/12/10
高誘電率基板を用いた伝送線路型薄膜磁界センサの高感度化

薮上信

電気学会マグネティックス医用・生体工学合同研究会　2010/11/26
磁界センサ・モーションキャプチャ Invited

薮上信

第2回産学連携推進サロン大崎産学連携推進サロン　2010/11/04
細長ワイヤレス磁気マーカによる生体用チューブの位置検出の検討

薮上信

電気学会マグネティックス研究会　2010/09/21
Thin film magnetic field sensor and biomagnetic measurement Invited

YABUKAMI Shin

2010/09/09
ミアンダ伝送線路による磁性薄膜の透磁率評価

薮上信

第34回日本磁気学会講演会　2010/09/06
粒子線加速器用高応答強磁場キッカー電磁石システムの開発

薮上信

第34回日本磁気学会学術講演会　2010/09/06
細長ワイヤレス磁気マーカを用いた生体用チューブの位置検出

薮上信

第34回日本磁気学会学術講演会　2010/09/06
高周波モーションキャプチャシステムの試作

薮上信

第34回日本磁気学会学術講演会　2010/09/06
高周波キャリア型薄膜磁界センサによる走査システムの試作

薮上信

第34回日本磁気学会学術講演会　2010/09/05
高誘電率基板を用いた高周波キャリア型薄膜磁界センサの高感度化

薮上信

第34回日本磁気学会学術講演会　2010/09/05
細長ワイヤレス磁気マーカによる生体用チューブの位置検出

薮上信

電気関係学会東北支部連合大会　2010/08/26
ミアンダ線路を用いた磁性薄膜の透磁率測定

薮上信

電気関係学会東北支部連合大会　2010/08/26
セラミック基板を用いた高周波キャリア型薄膜磁界センサの高感度化

薮上信

電気関係学会東北支部連合大会　2010/08/26
高周波キャリア薄膜磁界センサによる走査システムの評価

薮上信

電気関係学会東北支部連合大会　2010/08/26
高周波モーションキャプチャシステムの試作

薮上信

電気関係学会東北支部連合大会　2010/08/26
ミアンダ線路による磁性薄膜の透磁率評価の試み

薮上信

電気学会マグネティックス研究会　2010/08/03
Scanning system using thin film sensor for measuring magnetic field distribution International-presentation

YABUKAMI Shin

Proceedings of The 2nd International Symposium on Advanced Magnetic Materials and applications (ISAMMA2010)　2010
THIN FILM MAGNETIC FIELD SENSOR AND ITS APPLICATION FOR NON-DESTRUCTIVE AND BIOMAGNETIC MEASUREMENT International-presentation Invited

YABUKAMI Shin

Proceedings of The INTERNATIONAL WORKSHOP ON MAGNETIC WIRES (IWMW 2010)　2010
DOWNSIZING OF LC MARKERS FOR A WIRELESS MAGNETIC POSITION DETECTION SYSTEM International-presentation

YABUKAMI Shin

Proceedings of The 8th European Magnetic Sensors and Actuators Conference (EMSA 2010)　2010
SCANNING SYSTEM USING THIN FILM SENSOR FOR MEASURING LOW MAGNETIC FIELD International-presentation

YABUKAMI Shin

Proceedings of 8th European Magnetic Sensors and Actuators Conference (EMSA 2010)　2010
Transmission line type thin film sensor for magnetocardiogram measurement at room temperature International-presentation

YABUKAMI Shin

Proceedings of The 11th Joint MMM-Intermag Conference　2010
Analysis and improvement of detection accuracy for a wireless motion sensing system using integrated coil component International-presentation

YABUKAMI Shin

Proceedings of The 11th Joint MMM-Intermag Conference　2010
共振型磁気マーカを用いた顎運動計測システムの試作

薮上信

電気学会マグネティックス研究会　2009/09/25
磁性薄膜とコプレーナ線路を組み合わせた構造における位相変化型磁界センサの高感度化に関する検討

薮上信

日本磁気学会第33回学術講演会　2009/09/15
厚膜化したCoNbZr薄膜によるセンサの高感度化

薮上信

日本磁気学会第33回学術講演会　2009/09/15
細長ワイヤレス磁気マーカによる位置検出の検討

薮上信

日本磁気学会第33回学術講演会　2009/09/14
モーションキャプチャ用多層薄型マーカの試作

薮上信

日本磁気学会第33回学術講演会　2009/09/14
直接通電を用いた磁性薄膜の透磁率計測

薮上信

日本磁気学会第33回学術講演会　2009/09/13
厚膜化した磁性薄膜によるセンサの高感度化

薮上信

電気学会東北支部大会　2009/08/21
細長ワイヤレスマーカを用いた位置検出の検討

薮上信

電気学会東北支部大会　2009/08/21
直接通電による磁性薄膜の透磁率測定

薮上信

電気学会東北支部大会　2009/08/21
モーションキャプチャ用多層薄型マーカ

薮上信

電気学会東北支部大会　2009/08/21
高周波キャリア型薄膜磁界センサによる心磁界測定

薮上信

電気学会マグネティックス研究会　2009/08/07
室温動作の高感度薄膜磁界センサ、高電圧実験室の紹介 Invited

薮上信

電力関係会社施設見学会　2009/02/25
位置検出システム用アモルファスリボン積層薄型磁気マーカに関する検討

薮上信

平成21年電気学会全国大会　2009
プローブにより通電させた磁性薄膜の透磁率計測

薮上信

平成21年電気学会全国大会　2009
CoNbZr薄膜を用いた薄型磁界センサによる心磁界計測

薮上信

平成21年電気学会全国大会　2009
ワイヤレス磁気マーカによる顎運動計測システム

薮上信

平成21年電気学会全国大会　2009
Measurement of magnetocardiogram using by high-frequency carrier-type thin-film sensor at room temperature International-presentation

YABUKAMI Shin

Proceedings of The IEEE International Magnetics Conference (INTERMAG2009)　2009
Jaw tracking system using resonated wireless marker International-presentation

YABUKAMI Shin

Proceedings of The IEEE International Magnetics Conference (INTERMAG2009)　2009
Integration of excitation coil and pick-up coil array for wireless magnetic motion sensing system International-presentation

YABUKAMI Shin

Proceedings of The IEEE International Magnetics Conference (INTERMAG2009)　2009
ワイヤレス磁気マーカによる位置検出精度向上の検討

薮上信

第32回日本磁気学会学術講演会　2008/09/15
アモルファスCoFeSiB軟磁性薄膜の高周波キャリア型磁界センサへの適用

薮上信

第32回日本磁気学会学術講演会　2008/09/14
励磁コイル及び検出コイルアレイ一体型位置検出システムの検討

薮上信

第32回日本磁気学会学術講演会　2008/09/14
高周波キャリア型薄膜磁界センサによる心磁界計測

薮上信

第32回日本磁気学会学術講演会　2008/09/12
アモルファスCoNbZr薄膜を用いた磁界センサによる心磁界計測

薮上信

電気関係学会東北支部連合大会　2008/08/22
高周波キャリア型薄膜磁界センサによる心磁界計測の試み Invited

薮上信

電気学会マグネティックス研究会　2008/08/04
ワイヤレス磁気マーカの位置検出システムにおける位置精度向の検討

薮上信

電気学会マグネティックス研究会　2008/07/31
高感度磁気センサ、モーションキャプチャ、第36回産学連携セミナー Invited

薮上信

寺子屋せんだい　2008/07/24
直接通電による磁性膜透磁率測定の試み

薮上信

電気学会マグネティックス研究会　2008
Rough measurement of thin film permeability by contacting probes International-presentation

YABUKAMI Shin

Proceedings of The 53RD ANNUAL CONFERENCE ON MAGNETISM AND MAGNETIC MATERIALS (MMM 2008)　2008
Magnetocardiogram (MCG) measured by highly sensitive thin film sensor International-presentation Invited

YABUKAMI Shin

Proceedings of The Moscow International Symposium on Magnetism (MISM 2008)　2008
高周波キャリア型薄膜磁界センサを用いた心磁界測定

薮上信

電気学会マグネティックス研究会　2007/12/21
室温で動作する薄膜磁界センサ、ワイヤレス磁気マーカによるモーションキャプチャ

薮上信

環境防災研究所・研究発表会　2007/12/01
平面型ワイヤレス磁気マーカの検討

薮上信

第31回日本応用磁気学会学術講演会　2007/09/13
室温で動作し10^-13 T台の磁界検出分解能を有する薄膜磁界センサ

薮上信

EMC仙台ゼミナール　2007/07/24
高周波キャリア型薄膜磁界センサの高感度化

薮上信

電気学会マグネティックス研究会　2007/07/12
生体への応用における磁気利用センシング技術の高度化

薮上信

学会全国大会シンポジウム　2007/03/17
High-frequency Carrier-type Thin-film Sensor with a sub-pT resolution at room temperature International-presentation

YABUKAMI Shin

Proceedings of The 10th Joint MMM/Intermag Conference　2007
Wireless magnetic motion capture system - compensatory tracking of positional error caused by mutual inductance International-presentation

YABUKAMI Shin

Proceedings of The 10th Joint MMM/Intermag Conference　2007
高感度磁界センサ、モーションキャプチャシステムの開発

薮上信

せんだいコーディネーター協議会IT分科会　2006/12/07
多点ワイヤレス磁気マーカの位置検出システム

薮上信

日本応用磁気学会学術講演会　2006/09
多点検出可能なワイヤレス磁気モーションキャプチャシステム

薮上信

日本応用磁気学会学術講演会　2006/09
位相変化型磁界センサの特性に関する検討

薮上信

日本応用磁気学会学術講演会　2006/09
共振を利用した高周波キャリア型薄膜磁界センサの高感度化

薮上信

日本応用磁気学会学術講演会　2006/09
高周波磁気デバイス（高周波磁気計測技術・高周波キャリア型薄膜磁界センサ）

薮上信

日本応用磁気学会サマースクール　2006/07/14
Chaotic Noise Increase in High-frequency Carrier-type Thin-film Sensor International-presentation

YABUKAMI Shin

Proceedings of The IEEE International Magnetics Conference (INTERMAG 2006)　2006
Highly Accurate Position Sensing System for a slim LC Resonated Marker Using Phase Information International-presentation

YABUKAMI Shin

Proceedings of The IEEE International Magnetics Conference 2006 (INTERMAG 2006)　2006
Development of Wireless Magnetic Motion Capture System for Multi-Marker Detection International-presentation

YABUKAMI Shin

Proceedings of The IEEE International Magnetics Conference (INTERMAG 2006)　2006
DEVELOPMENT OF REALTIME AND HIGHLY ACCURATE WIRELESS MOTION CAPTURE SYSTEM UTILlZlNG SOFT FERRITE MAGNETIC CORE International-presentation

YABUKAMI Shin

Proceedings of The 2005 IEEE International Magnetics Conference (INTERMAG ASIA 2005)　2005
CHARACTERISTICS OF HIGHLY ENHANCED PHASE DETECTION TYPE MAGNETIC FIELD SENSOR BY CONTROLLING AN ANNEALTNG TEMPERATURE International-presentation

YABUKAMI Shin

Proceedings of The 2005 IEEE International Magnetics Conference (INTERMAG ASIA 2005)　2005
WIRELESS MOTION CAPTURE SYSTEM USING MAGNETIALLY-COUPLED LC RESONANT MARKER International-presentation

YABUKAMI Shin

Proceedings of The Joint European Magnetic Symposia (JEMS ’04)　2004
HIGHLY SENSITIVE GMI SENSOR FOR DETECTING MAGNETIC FIELD AT LOW FREQUENCY International-presentation

YABUKAMI Shin

Proceedings of The Joint European Magnetic Symposia (JEMS ’04), (2004)　2004
PROPERTY CONTROL METHOD OF A THIN FILM GMI SENSOR BASED ON CONTROLLING AN INCLINED ANGLE OF STRIPE MAGNETIC DOMAIN International-presentation

YABUKAMI Shin

Proceedings of The Joint European Magnetic Symposia (JEMS ’04)　2004
Position sensing system for wireless magnetic markers International-presentation

YABUKAMI Shin

Proceedings of The 1st International Conference on Positioning Technology (ICPT 2004)　2004
High-frequency carrier-type thin-film sensor for detecting magnetic field at low frequency International-presentation

YABUKAMI Shin

Proceedings of The 9th Joint MMM-INTERMAG CONFERENCE　2004
PHASE DETECTION OF HIGH FREQUENCY CARRIER TYPE THIN FILM SENSOR International-presentation

YABUKAMI Shin

Proceedings of The INTERNATIONAL MAGNETICS CONFERENCE (INTERMAG 2003)　2003
ELECTRICAL RESISTIVITY AND GHz PERMEABILIY OF (CoFeB)-(SiO1.9) HETERO-AMORPHOUS GRANULAR FILMS International-presentation

YABUKAMI Shin

Proceedings of The INTERNATIONAL MAGNETICS CONFERENCE (INTERMAG 2003)　2003
A NEW TRACKING SYSMTE OF JAW MOVEMENT USING TWO MAGNETS International-presentation

YABUKAMI Shin

Proceedings of The 2002 IEEE International Magnetics Conference (Intermag Europe 2002)　2002
IMPROVEMENT OF SENSITIVITY USING CARRIER SUPPRESSION TECHNIQUE IN HIGH FREQUENCY CARRIER TYPE THIN-FILM MAGNETIC FIELD SENSOR International-presentation

YABUKAMI Shin

Proceedings of The 2002 IEEE International Magnetics Conference (Intermag Europe 2002)　2002
A high sensitive carrier-type magnetic field sensor using a carrier suppressing circuit International-presentation

YABUKAMI Shin

Proceedings of The 8th Joint MMM-Intermag conference, (2001)　2001
Wireless ac magnetic markers for a motion capturing system International-presentation

YABUKAMI Shin

Proceedings of The 8th Joint MMM-Intermag conference, (2001)　2001
High sensitive permeability measurement of striped film inversely obtained by input impedance International-presentation

YABUKAMI Shin

Proceedings of The 8th Joint MMM-Intermag conference, (2001)　2001
MOTION CAPTURE SYSTEM USING MAGNETIC MARKER International-presentation

YABUKAMI Shin

Proceedings of The IEEE International Magnetics Conference (INTERMAG 2000)　2000
Two Dimensional Electromagnetic Noise Imaging System Using Planar Shielded-Loop Coil Array International-presentation

YABUKAMI Shin

Proceedings of The 4th International Symposium on Electromagnetic Compatibility (EMC ’99)　1999
MAGNETIC FLUX SENSING PRINCIPLE OF MICROSTRIP PICKUP COIL International-presentation

YABUKAMI Shin

Proceedings of The IEEE International Magnetics Conference (INTERMAG 1997)　1997
A NEW 1MHz-1.5GHz PERMEANCE METER BASED ON BOTH LUMPED ELEMENTS/TRANSMISSION LINE THEORIES International-presentation

YABUKAMI Shin

Proceedings of The IEEE International Magnetics Conference (INTERMAG 1996)　1996
HIGH FREQUENCY MAGNETIC FIELD SENSING COIL USING MICROSTRIP LINE International-presentation

YABUKAMI Shin

Proceedings of The IEEE International Magnetics Conference (INTERMAG 1995)　1995
A NEW lMHz -2GHz PERMEANCE METER FOR METALLIC THIN FILMS International-presentation

YABUKAMI Shin

Proceedings of The IEEE International Magnetics Conference (INTERMAG 1997)　1979

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Industrial Property Rights 58

磁界測定装置および磁界測定方法

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特許第6977987号

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磁界センサとバイアス方法

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特許第6899117号

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磁界センサとその製造⽅法

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特許6482001

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磁性体の透磁率計測装置および磁性体の透磁率計測方法

薮上信, 宮澤安範

特許6362249

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Electromagnetic noise measurement apparatus

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生体管理システム及び生体管理方法

伊達秀文, 薮上信, 木村光照

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磁性体の計測装置および磁性体の計測方法

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磁界センサとその製造方法

薮上信, 植竹宏明

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磁性体の透磁率計測装置および磁性体の透磁率計測方法

薮上信, 宮澤安範

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磁気刺激リハビリテーション装置

出江紳一, 金高弘恭, 高木敏行, 永富良一, 中里信和, 枦修一郎, 鈴木栄三郎, 阿部利彦, 森仁, 薮上信

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磁気刺激リハビリテーション装置

KANETAKA Hiroyasu, IZUMI Shinichi, TAKAGI Toshiyuki, NAGATOMI Ryoichi, NAKAZATO Nobukazu, HASHI Shuichiro, SUZUKI Eizaburo, ABE Toshihiko, MORI Hitoshi, YABUKAMI Shin

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環状中空体に固定されたＬＣ共振型磁気マーカの検出システム

薮上信, 金高弘恭, 小澤哲也, 枦修一郎

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磁性体の透磁率計測装置および磁性体の透磁率計測方法

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Capsule medical device position/posture detecting system

AOKI ISAO, UCHIYAMA AKIO, ARAI KENICHI, ISHIYAMA KAZUSHI, YABUKAMI SHIN

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磁性体の計測装置および磁性体の計測方法

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磁界センサ

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DETECTING SYSTEM OF POSITION AND POSTURE OF CAPSULE MEDICAL DEVICE

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US08010183

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Detecting system of position and posture of capsule medical device

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US08010182

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Detecting system of position and posture of capsule medical device

Aoki Isao, Uchiyama Akio, Arai Kenichi, Ishiyama Kazushi, Yabukami Shin

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カプセル型医療装置方向位置検出システム

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カプセル型医療装置システム

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INSTRUMENT AND METHOD FOR MEASURING THREE-DIMENSIONAL MOTION

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高周波キャリア型薄膜磁界センサ

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高精度ＬＣ共振型磁気マーカの位置、方向および等価的磁気モーメントの検出システム

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Instrument und Verfahren zum Messen einer dreidimensionalen Bewegung in einem lebenden Körper

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CAPSULE MEDICAL DEVICE POSITION/POSTURE DETECTING SYSTEM

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CN1929773

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カプセル型医療装置位置・姿勢検出システム

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INSTRUMENT AND METHOD FOR MEASURING THREE-DIMENSIONAL MOTION IN LIVING BODY

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CN100571623

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磁気センサユニットおよび磁気検出方法

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特許第4426875号

Property Type: Patent
ワイヤレス磁気マーカの位置および方向の検出方法およびそのシステム

薮上信, 荒井賢一, 石山和志, 岡崎靖雄, 枦修一郎

Property Type: Patent
磁気発生器並びに３次元運動測定装置及びその方法

荒井賢一, 薮上信, 金高弘恭

特許第4310159号

Property Type: Patent
磁界センサユニット

薮上信, 荒井賢一, 小澤哲也, 今江理人, 花土ゆう子

Property Type: Patent
高周波可変リアクタンス素子

中居倫夫, 阿部宏之, 荒井賢一, 山口正洋, 薮上信

特許第4418856号

Property Type: Patent
物体追跡装置

荒井賢一, 薮上信, 荒井薫

Property Type: Patent
位置・姿勢検出装置及びそれを用いたコンピュータ情報入力装置

荒井賢一, 山口正洋, 薮上信, 梅谷武, 若生直樹, 大宮司実, 板垣篤, 辻真哉

特許第3964167号

Property Type: Patent
３次元運動測定装置およびその方法並びに３次元位置検出装置

荒井賢一, 薮上信, 三谷英夫, 金高弘恭

特許第 4326721号

Property Type: Patent
給電線のない磁界発生素子

荒井賢一, 山口正洋, 薮上信, 若生直樹, 板垣篤, 辻真哉

Property Type: Patent
高周波キャリア型磁界センサの位相雑音抑圧方法及びその装置

薮上信, 荒井賢一, 山口正洋, 鈴木哲

特許第 3822058 号

Property Type: Patent
追尾型照射システム

荒井賢一, 石山和志, 山口正洋, 薮上信, 山田章吾, 高井良尋

Property Type: Patent
磁気マーカ位置検出方法および装置

荒井賢一, 山口正洋, 薮上信, 若生直樹, 板垣篤, 辻真哉

Property Type: Patent
磁界方向検出方法

荒井賢一, 山口正洋, 薮上信, 板垣篤, 渡辺光春, 板垣喜一, 斉藤昇, 布田孝一, 高橋洋, 田母神隆, 桜田幸雄

Property Type: Patent
磁化率測定装置及び磁化率測定方法

薮上信, 沖田和彦, 村山徹

Property Type: Patent
透磁率計測用プローブ及びそれを用いた透磁率計測装置

薮上信, 渡辺佳是, 沖田和彦

Property Type: Patent
透磁率計測用プローブ及びそれを用いた透磁率計測装置

薮上信, 渡辺佳是, 沖田和彦

Property Type: Patent
抗原検出装置及び抗原検出方法

薮上信, 沖田和彦

Property Type: Patent
透磁率計測用プローブ及びそれを用いた透磁率計測装置

薮上信, 沖田和彦

Property Type: Patent
透磁率及び誘電率を測定する測定装置及び測定方法

薮上信, 沖田和彦

Property Type: Patent
透磁率計測⽤プローブ及びそれを用いた透磁率計測装置

薮上信, 沖田和彦

Property Type: Patent
透磁率計測用プローブ及びそれを用いた透磁率計測装置

薮上信, 沖田和彦

Property Type: Patent
磁場測定装置及び磁場測定方法

薮上信, 三浦由則

Property Type: Patent
磁界センサとバイアス方法

薮上信, 植竹宏明

Property Type: Patent
応力印加機構及びそれを用いた磁歪計測装置、磁歪計測方法

内海良一, 島田寛, 薮上信

Property Type: Patent
磁界測定装置及び磁界測定方法

薮上信, 三浦由則

特許7312352

Property Type: Patent

Show all Show first 5

Research Projects 75

ミトコンドリア先制医療

Offer Organization: 日本医療研究開発機構（AMED）

System: AMEDムーンショット型研究開発事業

2021/04 - 2024/03
磁性ナノ粒子と生体物質の融合による磁気相変化を利用した高感度バイオ検出

薮上信

Offer Organization: 文部科学省

System: 文部科学省科学研究費補助金基盤研究(C)

2021/04 - 2024/03
トンネル磁気誘電効果を有するナノ複相構造薄膜の新機能生体センサーの展開

増本博, 小林伸聖, 薮上信, 曹洋, 青木英恵, 池田賢司, 佐々木啓一, 鈴木治

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2020/04/01 - 2023/03/31

More details Close

本研究グループは、磁性ナノ粒子（直径約数nm）が誘電体セラミックス中に均一に分散した薄膜である磁性体－誘電体ナノ複相構造薄膜を作製し、これまでに報告例の無い新しい機能変換材料である『トンネル磁気誘電（Tunneling Magneto-Dielectric:TMR）効果」（磁場を印加すると材料の誘電率が磁場の強さに応じて変化する現象。室温で動作する。本研究グループで命名）』を見いだした。本研究は、このTMD効果の特性向上や原理の究明といった基礎研究を進めるとともに、新しい生体センサーの応用研究という次の段階にステップアップするための基盤的研究を行うことを目的としている。今年度の成果として、①誘電体マトリックスとして用いるフッ化物（MgF2やBaF2）材料として、新たにSrF2に着目し、共スパッタリング法による高結晶化フッ化ストロンチウム－コバルトナノ複合薄膜の合成を実現し、理論に基づき、マトリックスの結晶化度を上げることでより高いトンネリング磁気誘電効果を得ることに成功した。②誘電体マトリックスとしてフッ化物に代わり各種酸化物を用いたナノ複相構造薄膜（Co-Al2O3、Co-MgO、Co-Ta2O5）を作製し、膜の電気抵抗のCo組成依存性がTMD特性と密接に関連していることを突き止めた。③これまでの磁性体－誘電体ナノ複相構造薄膜では、磁性体はおよそ球体ナノ粒子であったが、扁平ナノ粒子を作製することにより異方性を向上させて、膜の方向によりTMD特性を制御する手法を考案した。
リンパ節転移治療を目指したハイブリッド電磁加熱システムの開発と非臨床試験

薮上信

Offer Organization: 日本医療研究開発機構（AMED）

System: 日本医療研究開発機構（AMED）「橋渡し研究プログラム」

2022/04 - 2023/03
巨大ファラディー効果を示すナノグラニュラー薄膜材料の開発

Offer Organization: 文部科学省

System: 文部科学省科学研究費補助金基盤研究（B）

2020/04 - 2023/03
不要電波の高分解能計測・解析技術を活用したノイズ抑制技術の研究開発

Offer Organization: 総務省

System: 総務省電波資源拡大のための研究開発

2019/04 - 2023/03
カード型迅速ウイルス検出 IoTセンサモジュールの開発

薮上信

Offer Organization: 科学技術振興機構

System: 科学技術振興機構A-STEP トライアウトタイプ

2021/05 - 2022/03
口腔細菌および腸内細菌のセンシングデバイスと簡易迅速評価装置の開発

薮上信

Offer Organization: 東北大学

System: ２０１９年度学際研究支援プログラム

2019/04 - 2022/03
さりげないセンシングと日常人間ドックで実現する理想自己と家族の絆が導くモチベーション向上社会創生拠点（サテライト） Competitive

薮上信

Offer Organization: 科学技術振興機構

System: 革新的イノベーション創出プログラム（COI STREAM）

2013/11 - 2022/03
低コスト迅速高感度ウイルス検出システムの開発と事業化検証

薮上信

Offer Organization: 東北大学

System: 東北大学ビジネス・インキュベーション・プログラム

2020/10 - 2021/09
磁性体の評価受託サービス・評価装置製造・販売事業立ち上げの為の技術開発と事業化検証

薮上信

Offer Organization: 東北大学

System: ビスネス・インキュベータ・プログラムフェーズ１（育成）

2019/04 - 2020/03
新しい磁気光学効果を示すナノグラニュラー透明強磁性材料の開発 Competitive

小林伸聖

System: 科研費基盤研究（B）

2017/04 - 2020/03
ナノグラニュラー薄膜の構造制御による複合機能性材料の開発 Competitive

池田賢司

System: 科研費基盤研究（C）

2017/04 - 2020/03
室温動作のセンサで最高感度を有する高周波駆動薄膜磁界センサの開発と生体磁気計測 Competitive

薮上信

System: 科研費基盤研究（B）

2016/04 - 2020/03
生体内で自律動作可能な医用インテリジェント磁気マイクロ・ロボット開発のための総合的基礎研究 Competitive

荒井賢一

Offer Organization: 厚生労働省

System: 医薬品副作用被害救済・研究振興調査機構

1997/04 - 2020/03
Enhancement of electromagnetic nondestructive evaluation technique using thin-film magnetoimpedance sensor with domain wall motion at low frequency

Kikuchi Hiroaki, ISHIYAMA kazushi, HASHI shuichiro, YABUKAMI shin, TAKEZAWA masaaki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Iwate University

2016/04/01 - 2019/03/31

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The anomalous phenomena appeared on thin-film magnetoimpedance sensor element at a relatively lower frequency was analyzed theoretically based on a domain wall equation and discussed by combined with experimental results, which clarified that the phenomena is attributed to domain wall resonance. Moreover, we demonstrated the potential of high sensitive magnetic field sensor at lower frequency using the phenomena. Related to thin-film magnetoimpedance sensor, we also clarified that a bias direct current is effective to improve sensitivity. The bias direct current induces asymmetric impedance properties, which is explained by the effects of cross sectional shape of an element.
High-energy particle science by using Megagauss techniques

NAKAMURA Eiji, INAGAKI Shigeru, TAKAYAMA Masakazu, YABUKAMI Shin, ISHI Yoshihiro, UESUGI Tomonori, ASAI Tomohiko, KOGUCHI Haruhisa, SAKAI Izumi, SATO Hikaru, NAKAMURA Yuko, NAKAMURA Naoji, KINDO Koichi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Exploratory Research

Institution: High Energy Accelerator Research Organization

2014/04/01 - 2017/03/31

More details Close

The magnetic flux density of almost conventional magnets, even if using superconducting coils, is less than 10 T to control the motion of high-energy particles, because of the requirements on reliability and stability, especially for the recent experiments based on the use of statistical methods. On the other hand, the fundamental techniques have been promoted rapidly and provided many noble achievements in this decade, for example, the high-power laser, the MegaGauss techniques and so on. The possibilities of the higher magnetic field on high-energy particle handling were investigated in this study project. New scenarios related for high-energy particle science were discussed. The prototype pulsed magnet was assembled to confirm the adjustability to high-energy particle handling, and the formation of a sufficient mirror field with a peak field of 54 T was obtained. The representative achievements in this study project has summarized in the special issue of the academic journal.
アモルファス合金ナノワイヤーを用いた磁気センサ開発 Competitive

中山幸仁

System: 科研費基盤研究（B）

2013/04 - 2017/03
テスラ級超強磁場高応答キッカーシステムの開発と省電力高効率粒子線入出射法の実現 Competitive

中村英滋

System: 科研費基盤研究（B）

2013/04 - 2017/03
雷放電の磁界検出用薄膜磁界センサモジュールの開発 Competitive

薮上信

Offer Organization: 科学技術振興機構

System: マッチングプランナープログラム探索試験

2016/01 - 2017/01
インラインで大口径ウエハを測定可能な高周波磁性薄膜評価装置の開発 Competitive

内海良一

System: 宮城・仙台富県チャレンジ応援基金事業産学連携型育成支援事業

2015/04 - 2016/03
微細加工技術を用いた集積化磁界センサの高感度化 Competitive

薮上信

Offer Organization: 東北学院

System: 個別研究助成

2015/04 - 2016/03
室温で動作する生体内挿入用集積化磁界センサの開発 Competitive

薮上信

System: 科研費挑戦的萌芽研究

2013/04 - 2016/03
インラインで大口径ウエハを測定可能な高周波磁性薄膜評価装置の開発 Competitive

薮上信

Offer Organization: 科学技術振興機構

System: 復興促進プログラムマッチング促進

2012/10 - 2015/03
30 GHzをカバーする超高周波磁性薄膜透磁率評価装置の開発 Competitive

薮上信

Offer Organization: 科学技術振興機構

System: 研究成果最適展開支援プログラムA-STEP 探索タイプ

2013/08 - 2014/03
高感度薄膜磁界センサにより10^2 (CFU/ml)台の感度を有する微生物検出システムの開発

薮上信

Offer Organization: 科学技術振興機構

System: 研究成果展開事業 A-STEP機能検証フェーズ

2013/04 - 2014/03
誘電体薄膜の評価 Competitive

薮上信

Offer Organization: 電磁材料研究所

System: 共同研究助成

2013/04 - 2014/03
高感度薄膜磁界センサ作製および評価装置 Competitive

薮上信

Offer Organization: 文部科学省

System: 平成25年度私立学校施設整備補助金研究装置

2013/04 - 2014/03
サイバーフィジカル3D 協調インタラクション環境の研究開発 Competitive

北村喜文

Offer Organization: 総務省

System: 戦略的情報通信研究開発推進制度(SCOPE)

2011/04 - 2014/03
室温動作の薄膜磁界センサアレイによる生体磁気計測およびイメージング Competitive

薮上信

System: 科研費基盤研究（B）

2010/04 - 2014/03
環境保全と健常生活のための先端バイオテクノロジーの統合的研究 Competitive

遠藤銀朗

System: 私立大学戦略的研究基盤形成支援事業

2009/04 - 2014/03
室温で動作するハンディな高感度薄膜磁界センサの開発 Competitive

薮上信

Offer Organization: 科学技術振興機構

System: 研究成果最適展開支援プログラムA-STEP FS探索タイプ

2012/11 - 2013/10
ワイヤレス磁気マーカによる経管チューブ誤挿入検知装置の動物実験 Competitive

薮上信

Offer Organization: 科学技術振興機構

System: 復興促進プログラム A-STEP 探索タイプ

2012/10 - 2013/09
室温で動作する生体磁気計測用集積化薄膜磁界センサの開発 Competitive

薮上信

Offer Organization: 中谷電子計測技術振興財団

System: 第28回技術開発研究助成

2012/04 - 2013/03
ワイヤレス磁気マーカを用いた経管チューブの誤挿入検知システムの開発 Competitive

薮上信

Offer Organization: 科学技術振興機構

System: 研究成果最適展開支援プログラム A-STEP 探索タイプ

2011/08 - 2012/03
高磁場高応答キッカー電磁石システムの開発 Competitive

中村英滋

System: 科研費基盤研究（C）

2009/04 - 2012/03
室温で動作する薄膜磁界センサによる脳磁界計測の試み Competitive

薮上信

System: 科研費挑戦的萌芽研究

2009/04 - 2012/03
室温で動作する高感度薄膜磁界センサの開発 Competitive

薮上信

Offer Organization: 石田（實）記念財団

System: 平成23年度研究奨励賞

2011/12 -
直接通電による磁性薄膜の高周波評価装置の開発 Competitive

薮上信

Offer Organization: 科学技術振興機構

System: 地域ニーズ即応

2009/04 - 2011/03
室温で動作する生体磁気信号計測用薄膜磁界センサの開発 Competitive

薮上信

Offer Organization: 科学技術振興機構

System: 先端計測分析技術・機器開発事業

2007/10 - 2010/03
運動機能サポートシステムの開発 Competitive

枦修一郎

System: 科研費基盤研究（B）

2007/04 - 2010/03
室温で動作する薄膜磁界センサを用いた磁気シールドルーム外での生体磁気計測への適用 Competitive

薮上信

Offer Organization: 島津科学技術振興財団

System: 平成21年度研究開発助成

2010/02 -
ワイヤレス磁気マーカによる生体挿入チューブの位置検出装置の開発 Competitive

薮上信

Offer Organization: 医科学応用研究財団

System: 平成21年度調査研究助成

2009/11 -
高電気抵抗膜を用いた薄膜磁界センサのサブpT台への高分解能化 Competitive

薮上信

System: 科研費萌芽研究

2007/04 - 2009/03
低侵襲かつ簡便な摂食・嚥下機能評価システムの構築に関する研究 Competitive

金高弘恭

Offer Organization: 厚生労働省

System: 科学研究費補助金

2006/04 - 2009/03
放射線治療用ワイヤレス磁気マーカ追尾システムの開発 Competitive

薮上信

System: 科研費基盤研究（B）

2006/04 - 2009/03
ワイヤレス磁気マーカを用いた内視鏡等の位置検出システム Competitive

薮上信

Offer Organization: 内視鏡医学研究振興財団

System: 平成20年度研究助成

2009/01 -
ワイヤレス磁気マーカを用いた生体内挿入用チューブの位置・方向検出システム Competitive

荒井賢一

Offer Organization: 科学技術振興機構

System: シーズ発掘試験研究

2007/08 - 2008/03
室温動作の高感度磁界センサを用いた生体磁気信号計測 Competitive

薮上信

Offer Organization: 東北学院

System: 共同研究助成

2007/04 - 2008/03
室温で動作する高感度薄膜磁界センサによる生体磁気信号計測 Competitive

薮上信

Offer Organization: 大川情報通信基金

System: 2007年度研究助成

2007/11 -
室温で動作し10^-13Ｔ台の磁界検出分解能を有する薄膜磁界センサ Competitive

薮上信

Offer Organization: 船井情報科学振興財団

System: 第6回船井情報科学振興賞

2007/04 -
室温で動作する超高感度磁界センサによる生体磁気計測への適用 Competitive

薮上信

Offer Organization: 科学技術振興機構

System: シーズ育成試験研究

2006/04 - 2007/03
室温で動作する高感度薄膜磁界センサの研究 Competitive

薮上信

Offer Organization: 村田学術振興財団

System: 第22回研究助成

2006/04 - 2007/03
超高感度薄膜磁界センサシステムの研究 Competitive

薮上信

Offer Organization: インテリジェント・コスモス学術振興財団

System: シーズ熟成研究助成および実用化研究助成

2005/06 - 2007/03
片側性唇顎口蓋裂患者に対する顎機能解析システムの開発と臨床応用 Competitive

金高弘恭

System: 科研費基盤研究（C）

2004/04 - 2007/03
ワイヤレス磁気マーカを用いた生体内部の高精度位置検出システムの開発 Competitive

薮上信

Offer Organization: 新エネルギー・産業技術総合開発機構（NEDO）

System: 産業技術研究助成事業

2003/10 - 2006/09
室温動作の超高感度磁界センサによる非破壊検査、生体磁気計測 Competitive

荒井賢一

Offer Organization: 経済産業省

System: 地域新生コンソーシアム

2004/04 - 2006/03
室温で動作する生体磁気情報計測用超高感度磁界センサシステムの開発 Competitive

荒井賢一

System: 科研費基盤研究（A）

2004/04 - 2006/03
微細探針を用いた直接通電型薄膜透磁率測定システム Competitive

薮上信

System: 科研費若手研究（B）

2004/04 - 2006/03
ワイヤレス薄型磁気マーカを用いた指のモーションキャプチャシステムの開発 Competitive

薮上信

Offer Organization: 総務省

System: 戦略的情報通信研究開発推進制度(SCOPE)

2003/11 - 2006/03
位相検出による高周波キャリア型薄膜磁界センサの高感度化 Competitive

荒井賢一

System: 科研費基盤研究（B）

2002/04 - 2004/03
超薄型高感度磁界センサを用いた顎機能診断装置の開発 Competitive

薮上信

System: 科研費萌芽研究

2002/04 - 2004/03
直接通電による磁性薄膜の高周波透磁率計測装置の開発 Competitive

薮上信

System: 科研費若手奨励研究

2001/04 - 2003/03
室温・超高感度磁気センサの開発 Competitive

荒井賢一

Offer Organization: 科学技術振興事業団

System: 地域結集型共同研究事業

1998/04 - 2003/03
極微小・高Q集積化RF強磁性薄膜インダクタ

山口正洋, ぺい碩, 池田愼治, 金基ひょん, 薮上信, 石山和志, 荒井賢一

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 特定領域研究

Institution: 東北大学

2001 - 2003

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まず,昨年度完成し製品化も実現した9GHz帯域薄膜透磁率測定装置の性能に関し,アメリカ国立標準技術研究所(NIST)およびフランス原子力研究所(CEA)と試料交換測定によるデータ検証を実施し,10%以内の誤差で測定結果(共鳴周波数)が一致するという結果を得た.これは,本装置の性能の高さを実証したものである. 次に,昨年度のシミュレーション結果に基づいて,閉磁路型スパイラルインダクタを試作した.これは,スパイラルコイルの上下に2枚の磁性薄膜を配置しその端部を接触させた構造を有している.プロセス上のポイントは,上下の磁性薄膜間の絶縁層となるSiO2にテーパエッチングを施し,30〜45°の緩やかな角度で下部磁性膜に接触させたことである.結果として,コイル幅/間隔=10/3μmと10/5μmの設計でかつコイル表面と磁性膜との距離が1μmにおいてQ=12@1GHzが得られた.1GHzにおけるQ値としてはこれまで報告された磁性薄膜インダクタの中で最も高い値であり,RF集積化磁性薄膜インダクタの実用性を実証できた. 以上の特性解析にあたり,ダブルπ型等価回路を考案し,その16個の回路定数導出法も構築した.収束計算のコスト関数としてはZ-パラメータの対数を用いることが最適である.この解析から,1-2GHzでは,磁性薄膜をインダクタに導入してもその浮遊容量に伴うLC共振周波数の低下は生じないよう設計でき,実用上必須の条件の一つが満足できることもわかった. 磁性薄膜インダクタの作製プロセスと設計法を応用し,低抵抗のCoZrNbアモルファス膜,高抵抗のCo-Zr-Oグラニュラー膜,磁気異方性が高いCo-Pd-Al-Oグラニュラー膜などを薄膜コプレーナ線路に集積化したところ,共鳴損失と渦電流損失によって4〜20GHzまで広帯域な減衰特性を示した.この帯域の減衰量はCo-Pd-Al-Oで15dBに達した一方で,1GHz以下での挿入損失は1dB以下と良好であった.インピーダンス整合を大きく乱すことなく,高周波ノイズ成分だけを低減できている事が明らかになり,IT機器内電磁干渉対策技術のロードマップから数年以内に必要とされる集積化電磁雑音対策素子のニーズに応えうるデバイスとしての可能性を明らかにできた.
磁気マーカを用いた位置検出システムの医療応用 Competitive

System: 創造的情報通信技術研究開発推進制度

1999 - 2003
Medical application of magnetic motion capturing system Competitive

System: The public participation program for the promotion of creative info-communications technology R and D

1999 - 2003
高周波キャリア型磁界センサの開発 Competitive

System: 科学研究費補助金

1997 - 2003
Development of high frequency carrier type magnetic field sensor Competitive

System: Grant-in-Aid for Scientific Research

1997 - 2003
Development of GHz-Drive Magnetic Thin Film Inductors for Integrated Circuits

YAMAGUCHI Masahiro, YABUKAMI Shin, ISHIYAMA Kazushi, ARAI Ken-ichi, SHIMADA Yutaka

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2000 - 2002

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A new GHz-band permeameter has been developed to find out the CoNbZr, FeAlO and (CoFeB)SiO_2 Thin-film materials as the possible candidates for GHz-drive inductors. A new technique on raise the ferromagnetic resonance (FMR) frequency has also been developed; Microfabricate narrow slits along the easy axis of magnetization and apply RE magnetic field along the hard axis. Then magnetic losses at 2GHz can be negligible through the optimum slit design method we established. An integrated spiral inductor with 0.1-1.0μm-thick silted CoNbZr film on the top exhibited L=8nH and Q=5 at 2GHz, Its size was 330x330μm^2. Provided that the silted CoNbZr magnetic film are installed below and on the spiral (sandwich type inductor), L=7.9nH and Q=13 has been achieved is the 200x400μm^2 size. This is worth achieving main objective of this work. An RE magnetic near field probe has been developed to analyze leakage flux from the integrated inductor to semiconductor circuit. The probe exhibited world-highest spatial resolution of 40μm at 1GHz. It is estimated that the electromagnetic interference to the integrated circuit would be negligible. An extensive application of integrated ferromagnetic film has been proposed to suppress RF in-line electromagnetic noise by means of FMR losses. Insertion loss at 1GHz was only 0.4dB while is reached 15dB as 20GHz. Thus this work has been concluded, showing a practical possibility of ferromagnetic integrated inductors as well as to pioneering a new technology field of "soft magnetic applications in the GHz range for IT." The first and second international symposium on "High Frequency Micromagnetic Devices and Materials" has been initiated by the investigators.
高周波キャリア型薄膜磁界センサおよび磁気モーションキャプチャシステムの研究 Competitive

薮上信

Offer Organization: トーキン科学技術振興財団

System: 第20回研究奨励賞

2000/05 -
高周波磁界のニアフィールド計測に関する研究 Competitive

薮上信

System: 科研費特別研究員奨励費

1997/04 - 1998/03
磁気記録ヘッド等微細磁性薄膜の高周波磁気特性 Competitive
Medical application of magnetic motion capturing system, Development of high frequency carrier type magnetic field sensor, High frequency characteristics of small magnetic film Competitive
High frequency characteristics of small magnetic film Competitive

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Teaching Experience 26

高電圧工学特論　東北学院大学大学院
生体電磁工学特論　東北学院大学大学院
工学修士研修　東北学院大学大学院
生体機能イメージング　東北学院大学
伝送工学　東北学院大学
電磁気学　東北学院大学
高電圧工学　東北学院大学
電磁気学演習　東北学院大学
電磁エネルギー変換工学　東北学院大学
卒業研究　東北学院大学
ジュニアセミナー（電気情報工学セミナー）　東北学院大学
電気情報工学実験（高電圧実験）　東北学院大学
プログラミング演習　東北大学
電気・通信・電子・情報工学実験　東北大学
物理学基礎演習　東北学院大学
ベクトル解析学　東北学院大学
数学基礎演習　東北学院大学
コンピュータプログラミング　東北学院大学
フレッシュパーソンセミナー　東北学院大学
読解・作文の技法　東北学院大学
研究・発表の技法　東北学院大学
電磁エネルギー変換A　東北大学
電気エネルギー応用工学　東北大学
ユビキタスエネルギー工学　東北大学
卓越大学院メディカルシステムPBL　東北大学
スピン工学セミナー　東北大学

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Works 7

磁気式モーションキャプチャシステムのFESへの応用

2000 -
放射線照射装置用磁気マーカの位置検出システムの応用

2000 -
磁気式モーションキャプチャシステムの顎運動計測装置への応用

2000 -
Detecting System of FES

2000 -
Position sensing system for X-ray system

2000 -
Detecting system of jaw movement

2000 -
高周波磁気特性評価装置およびプローブ

薮上信

Type: Other

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Media Coverage 10

5G対応デバイスの開発を支援する東北大学発ベンチャー

ASCII

2020/03/10

Type: Other
夏休み子ども科学キャンパス

ミヤギテレビ　OH!バンデス

2018/07/31

Type: TV or radio program
落雷 2時間で1000発都市で多発した原因は？

TBSテレビ　あさチャン(電話出演)

2017/08/21

Type: TV or radio program
東北大など、アモルファス合金のナノワイヤで磁気センサー作製

日刊工業新聞社　日刊工業新聞

2014/11/25

Type: Newspaper, magazine
磁性材料の高周波特性切り出さず直接評価

日刊工業新聞社　日刊工業新聞

2013/11/25

Type: Newspaper, magazine
特集『雷』

東北放送　Ｎスタみやぎ

2011/08/23

Type: TV or radio program
工学部と地元の研究機関が、新型センサを共同開発

東北学院大学　東北学院大学広報誌『ウーラノス』

2009/12/20

Type: Newspaper, magazine
【私の研究】室温で動作する高感度薄膜磁界センサの研究

東北学院　東北学院時報

2009/01/15
「心磁計」簡単・安価に東北学院大准教授ら試作

朝日新聞社　朝日新聞

2008/09/29

Type: Newspaper, magazine
Dr.モーゼの身近な産学連携への道

仙台商工会議所　仙台商工会議所月報『飛翔』

2007/12

Type: Newspaper, magazine

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