TOHOKU UNIVERSITY Researchers

Details of the Researcher

Home

日本語 English

Makoto Ohtsuka

Section

Institute of Multidisciplinary Research for Advanced Materials

Job title

Associate Professor

Degree

博士（工学）（東北大学）

researchmap

https://researchmap.jp/read0168649

J-GLOBAL ID

200901071817050177

Committee Memberships 9

公益社団法人日本金属学会　会報編集委員

2007/03 - Present
日本金属学会東北支部　支部委員

2023/05 - 2025/04
資源・素材学会東北支部　幹事

2020/04 - 2024/03
資源・素材学会東北支部　庶務幹事

2020/04 - 2022/03
公益社団法人日本金属学会　会報編集委員委員長

2019/03 - 2021/03
公益社団法人日本金属学会　会報編集委員副委員長

2015/03 - 2019/03
公益社団法人日本金属学会　会誌・欧文誌編集委員

2008/03 - 2013/03
The 8th IUMRS International Conference on Advanced Materials (IUMRS-ICAM 2003)　実行委員

2003/03 - 2003/10
資源・素材学会東北支部　幹事

2001/06 - 2003/06

Show all ︎Show first 5

Professional Memberships 6

MRS
TMS
THE JAPAN SOCIETY OF APPLIED PHYSICS
THE MINING AND MATERIALS PROCESSING INSTITUTE OF JAPAN
THE JAPAN INSTITUTE OF METALS AND MATERIALS
The Materials Research Society of Japan

︎Show all ︎Show first 5

Research Interests 7

材料強度
マイクロマシン
水素分離膜
水素吸蔵材料
形状記憶材料
機能性薄膜
組織制御

Research Areas 2

Nanotechnology/Materials / Structural and functional materials / Strength of Materials
Nanotechnology/Materials / Metals and resources production / Materials Processing

Awards 3

第16回学術貢献賞受賞

2018/09　公益社団法人日本金属学会　強磁性形状記憶合金膜の高機能化と新規デバイスへの展開
インテリジェント・コスモス奨励賞

2004/05/13　財団法人インテリジェント・コスモス学術振興財団　強磁性形状記憶合金スパッタ膜の機能性の解明とマイクロアクチュエータの開発
素材工学会研究奨励賞

2004/02/19　財団法人素材工学研究会　強磁性形状記憶合金スパッタ膜の作製とマイクロアクチュエータの開発

Papers 131

Effect of temperature on the growth behavior of AlN crystals by solution growth method using type 304 stainless steel fluxes International-journal Peer-reviewed

Go Shinnoda, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

Materials Science in Semiconductor Processing　194　109532-109532　2025/08
Publisher: Elsevier BV
DOI： 10.1016/j.mssp.2025.109532 　

ISSN： 1369-8001
Thermodynamics-assisted solution growth of AlN single crystals with Fe-Cr based fluxes International-journal Peer-reviewed

Sen Li, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

Journal of Alloys and Compounds　1022　179933-179933　2025/04
Publisher: Elsevier BV
DOI： 10.1016/j.jallcom.2025.179933 　

ISSN： 0925-8388

More details Close

In this study, Fe-Cr based fluxes were investigated for the solution growth of AlN single crystals due to the high nitrogen solubility. Thermodynamic calculations demonstrated that the addition of Cr contributed to achieving a higher nitrogen content in Fe-Cr flux, which was expected to improve the AlN growth rate. However, it was found that the growth rate of AlN and the Cr content in the flux were not simply positively correlated. To explain this phenomenon, a mechanism based on the effective nitrogen content in flux was proposed. By further utilizing this mechanism, the Fe-26 mass% Cr (Fe-26Cr) alloy was designed as a flux and the optimal growth temperature was estimated, and then experimentally validated. Using Fe-26Cr flux, the growth rate of AlN reached 48 μm/h at 1675 °C. The full-width at half-maximum (FWHM) of the X-ray rocking curves (XRCs) for the (0002) and (10−12) reflections in grown AlN single crystals were 72 and 90 arcsec, respectively. Furthermore, the introduction of 2 mass% Al into flux (Fe-26Cr-2Al flux) resulted in a reduction of the O impurity concentrations in the grown AlN crystals by approximately 70 % compared to the AlN synthesized without additional Al.
Liquidus surface projection and vertical sections of the phase diagram for the Mo–Mo₅SiB₂–TiC pseudo-ternary system International-journal Peer-reviewed

Xi Nan, Ryogo Sawada, Haruki Nakashima, Masayoshi Adachi, Makoto Ohtsuka, Kyosuke Yoshimi, Hiroyuki Fukuyama

International Journal of Refractory Metals and Hard Materials　128　106998-106998　2025/04
Publisher: Elsevier BV
DOI： 10.1016/j.ijrmhm.2024.106998 　

ISSN： 0263-4368

More details Close

TiC-reinforced Mo–Si–B alloys (designated as MoSiBTiC alloys) exhibit great potential for application in the aerospace industry, due to their high melting point, moderate density and attractive high-temperature strength and creep resistance. Nevertheless, further material design and industrialization requires more systematic understanding of the phase diagram and solidification paths of Mo–Mo5SiB2–TiC pseudo-ternary system. In this study, an advanced ultra-high temperature thermal analysis method employing blackbody radiation and an electromagnetic levitation technique for in situ observation of the solidification process, were utilized to experimentally investigate the solidification process and reaction temperature of alloys in the vicinity of the Mo–Mo5SiB2–TiC ternary eutectic point. On the basis of the experimental results, three vertical sections of phase diagram at 9 mol% Mo5SiB2, 10 mol% TiC, and 70 mol% Moss isopleths in the Mo–Mo5SiB2–TiC pseudo-ternary system were established. The liquidus surface projection on the Mo–Mo5SiB2–TiC system has also been reconstructed, with the addition of a new Mo2B primary phase region and a larger Mo5SiB2 primary phase region than previously reported.
Density, Normal Spectral Emissivity, Heat Capacity, and Thermal Conductivity of the Ti6Al4V Melt Measured by Electromagnetic Levitation with a Static Magnetic Field International-journal Peer-reviewed

Manabu Watanabe, Suguru Funada, Makoto Ohtsuka, Masayoshi Adachi, Hiroyuki Fukuyama

International Journal of Thermophysics　46　(4)　2025/02/25
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s10765-025-03521-9 　

ISSN： 0195-928X

eISSN： 1572-9567

More details Close

This study aimed to accurately measure the density (ρ), normal spectral emissivity (ε), heat capacity at constant pressure (C _p), and thermal conductivity (κ) of the Ti–6 mass % Al–4 mass % V (Ti64) melt by electromagnetic levitation with a static magnetic field and laser modulation calorimetry. A static magnetic field was applied to the levitated Ti64 melt to suppress the surface oscillation and translational motion of the droplets, and to suppress the convection flow inside the droplet for each property measurement, as needed. The measurement uncertainty was analyzed for all of the thermophysical property data. The excess volume and excess heat capacity of the Ti64 melt obtained in this study were compared with those evaluated using the ideal solution model. The contribution of the thermal vibrations of the atoms in κ for the Ti64 melt was evaluated from the difference between the measured thermal conductivity (κ) value and the κ values calculated using the Wiedemann–Franz law.
Development of a New Solution Growth Method for AlN Single Crystals Using Type 430 Ferritic Stainless Steel Flux International-journal Peer-reviewed

Sen Li, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

Crystal Growth & Design　24　(13)　5549-5558　2024/06/13
Publisher: American Chemical Society (ACS)
DOI： 10.1021/acs.cgd.4c00329 　

ISSN： 1528-7483

eISSN： 1528-7505

More details Close

The solution growth method is an economical and environmentally friendly approach to producing aluminum nitride (AlN) single crystals. However, the fluxes used in the solution growth method have low nitrogen solubility, which limits the growth rate of AlN. In this study, as part of the development of a solution growth method for AlN using Fe-Cr fluxes with high nitrogen solubility, experiments were conducted using type 430 ferritic stainless steel, which is composed mainly of Fe-Cr, as the flux. Through a series of experiments, we report the results of the optimization of various experimental growth parameters (AlN polarity, cooling rate, and growth temperature). Furthermore, a growth mechanism based on the Al:N ratio in the flux is proposed, introducing the concept of effective nitrogen content to explain how the growth temperature affects the AlN growth rate using Fe-Cr flux. © 2024 The Authors. Published by American Chemical Society.
Multilayer Fe₃O₄-doped ITO indium saving indium tin oxide thin films International-journal International-coauthorship Peer-reviewed

Svitlana Petrovska, Ruslan Sergiienko, Bogdan Ilkiv, Takashi Nakamura, Makoto Ohtsuka

Molecular Crystals and Liquid Crystals　769　(2)　226-233　2024/06/03
Publisher: Taylor and Francis Ltd.
DOI： 10.1080/15421406.2024.2355397 　

ISSN： 1542-1406

eISSN： 1563-5287

More details Close

Multilayer Fe3O4-doped indium saving indium-tin oxide (ITO) thin films were fabricated by sputtering method. Double-layered Fe3O4-doped indium saving indium-tin oxide (ITO) thin films consisted of 12 nm layer of conventional indium tin oxide (90 mass% In2O3 and 10 mass% SnO2) and 138 nm layer of indium saving indium-tin oxide (50 mass% In2O3, 50 mass% SnO2 and Fe3O4-doped) were grown on preheated at 523 K glass substrates. Obtained polycrystalline ITO thin films exhibit volume resistivity of 416 µΩcm, electron mobility 28 cm2/V·s, carrier density 5.3 × 1020 cm−3 and average optical transmittance above 85% in visible range of spectrum. © 2024 Taylor & Francis Group, LLC.
Experimental investigations of 9 mol.% Mo₅SiB₂ isopleth phase diagram in Mo–Mo₅SiB₂ –TiC pseudo-ternary system International-journal Peer-reviewed

Xi Nan, Ryogo Sawada, Haruki Nakashima, Masayoshi Adachi, Makoto Ohtsuka, Kyosuke Yoshimi, Hiroyuki Fukuyama

Materials Today Communications　39　109239-1-109239-9　2024/06
Publisher: Elsevier BV
DOI： 10.1016/j.mtcomm.2024.109239 　

ISSN： 2352-4928

More details Close

The present work focuses on gaining a systematic understanding of the microstructure variation and solidification reactions of alloys in the Mo-rich portion of the Mo–Mo5SiB2(T2)–TiC pseudo-ternary system. A series of MoSiBTiC alloys with 9 mol% T2 were selected from the vicinity of the Mo–TiC binary and Mo–Mo5SiB2(T2)–TiC ternary eutectic point to carefully examine the solidification pathway and phase diagram. The solidification reaction temperature of the alloys was detected via an ultra-high-temperature thermal analysis method using blackbody radiation. Solidification was observed in situ using an electromagnetic levitation (EML) apparatus, and the microstructure evolution of solidified EML samples under different thermal histories was characterized. The results provide an experimentally based reassessment of the liquidus surface projection. The primary Moss phase region is shown to be larger than indicated in previously reported data, and a Mo2B primary region should exist in the triangle. As the main result of the investigation of the solidification pathway of a series of MoSiBTiC alloys, an isopleth phase diagram with 9 mol.% T2 in Mo–Mo5SiB2(T2)–TiC pseudo-ternary system is presented.
Comparative study of RF sputtered Fe₂O₃- and Fe₃O₄-doped indium saving indium tin oxide thin films International-journal International-coauthorship Peer-reviewed

Svitlana Petrovska, Ruslan Sergiienko, Bogdan Ilkiv, Takashi Nakamura, Makoto Ohtsuka

Molecular Crystals and Liquid Crystals　768　(8)　128-138　2024/05/15
Publisher: Taylor and Francis Ltd.
DOI： 10.1080/15421406.2024.2348192 　

ISSN： 1542-1406

eISSN： 1563-5287

More details Close

In present work the properties of iron-doped indium tin oxide (ITO) films with reduced to 50 mass% indium oxide content prepared by co-sputtering of ITO and Fe2O3 targets and ITO and Fe3O4 targets in mixed argon–oxygen atmosphere were studied by various methods. The influence of different working gas flow rates, RF power of iron oxide targets, type of doping oxide and heat treatment temperatures on the electrical, optical, structural, and morphological properties of the films was characterized by means of four-point probe method, ultraviolet–visible (UV–Vis) spectroscopy, X-ray diffraction and atomic force microscopy. © 2024 Taylor & Francis Group, LLC.
Origami-Inspired Bistable SMA Microdevice International-journal International-coauthorship Peer-reviewed

Vincent Gottwald, Lena Seigner, Makoto Ohtsuka, Manfred Kohl

International Conference on Shape Memory and Superelastic Technologies　84840　74-75　2024/05/06
Publisher: ASM International
DOI： 10.31399/asm.cp.smst2024p0074 　

ISSN： 2831-9532

eISSN： 2831-9524
Synthesis of AlN single crystal by solution growth method using type 430 ferritic stainless steel flux International-journal Peer-reviewed

Sen Li, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

AIP Advances　13　(8)　085105-1-085105-5　2023/08/01
Publisher: AIP Publishing
DOI： 10.1063/5.0161962 　

eISSN： 2158-3226

More details Close

We propose a new AlN crystal growth method using Fe-based fluxes. AlN single crystals with a thickness of 67–212 µm were epitaxially grown on an AlN bulk substrate by a solution growth method using type 430 ferritic stainless steel flux. The full width at half maximum values of the x-ray rocking curves of (0002) and (10–12) of the synthesized AlN were 137 and 83 arcsec, respectively. The impurity concentrations of carbon were significantly decreased from 3 × 1019 atoms/cm3 in seed crystal to 6 × 1017 atoms/cm3 in synthesized crystal. The features of the method developed in this study are described as follows: (1) steel-based alloys are used as a flux, which are readily available and low-cost; (2) the growth temperature is 1700 °C, which is much lower than that of the sublimation method; (3) no high-pressure vessel is required because growth can be performed under 1 atmospheric pressure conditions; and (4) waste gas detoxification equipment is not required because only N2 gas is used and no toxic or flammable gases are used. Because of the above features (1) through (4), this is an effective crystal growth process from the perspective of ensuring the economics and safety of the facility.
DC sputtered iron-doped indium saving indium tin oxide thin films using Fe₃O₄ target International-journal International-coauthorship Peer-reviewed

Svitlana Petrovska, Rruslan Sergiienko, Takashi Nakamura, Makoto Ohtsuka

Molecular Crystals and Liquid Crystals　767　(1)　70-78　2023/07/04
Publisher: Informa UK Limited
DOI： 10.1080/15421406.2023.2228593 　

ISSN： 1542-1406

eISSN： 1563-5287

More details Close

In the present work, the properties of iron-doped indium tin oxide (ITO) films with reduced to 50 mass% indium oxide (In2O3) content prepared by co-sputtering of ITO and Fe3O4 targets in the mixed argon-oxygen atmosphere were studied by various methods such as four-point probe method, Ultraviolet-Visible spectroscopy, X-ray diffraction and dynamic force microscopy. The influence of different working gas flow rates and heat treatment temperatures on the electrical, optical, structural, and morphological properties of the films was characterized. Iron doping resulted in increasing optical transmittance of ITO thin films. It has been found that films sputtered onto preheated substrites under optimum conditions showed values of volume resistivity 1480 µΩcm that is much lower than that of ITO50:Fe3O4 films sputtered onto unheated substrates and average optical transmittance in the visible range over 85%. It has been revealed that iron-doped ITO thin films deposited under optimum conditions have low root mean square height (Sq) 0.67 nm and arithmetical mean height (Sa) 0.52 nm.
Resonant Self-Actuation Based on Bistable Microswitching International-journal International-coauthorship Peer-reviewed

Joel Joseph, Makoto Ohtsuka, Hiroyuki Miki, Manfred Kohl

Actuators　12　(6)　245-1-245-14　2023/06/13
Publisher: MDPI AG
DOI： 10.3390/act12060245 　

eISSN： 2076-0825

More details Close

We present the design, simulation, and characterization of a magnetic shape-memory alloy (MSMA) film actuator that transitions from bistable switching to resonant self-actuation when subjected to a stationary heat source. The actuator design comprises two Ni-Mn-Ga films of 10 µm thickness integrated at the front on either side of an elastic cantilever that moves freely between two heatable miniature permanent magnets and, thus, forms a bistable microswitch. Switching between the two states is induced by selectively heating the MSMA films above their Curie temperature Tc. When continuously heating the permanent magnets above Tc, the MSMA film actuator exhibits an oscillatory motion in between the magnets with large oscillation stroke in the frequency range of 50–60 Hz due to resonant self-actuation. A lumped-element model (LEM) is introduced to describe the coupled thermo-magnetic and magneto-mechanical performance of the actuator. We demonstrate that this performance can be used for the thermomagnetic energy generation of low-grade waste heat (T < 150 °C) with a high power output per footprint in the order of 2.3 µW/cm2.
Effect of oxygen flow rate on properties of multilayer aluminum-doped indium saving ITO thin films produced by sputtering method International-journal International-coauthorship Peer-reviewed

Rruslan Sergiienko, Svitlana Petrovska, Bogdan Ilkiv, Takashi Nakamura, Makoto Ohtsuka

Molecular Crystals and Liquid Crystals　765　(1)　114-120　2023/05/23
Publisher: Informa UK Limited
DOI： 10.1080/15421406.2023.2215033 　

ISSN： 1542-1406

eISSN： 1563-5287

More details Close

Multilayer aluminum-doped indium saving indium-tin oxide (ITO) thin films with low volume resistivity and high transmittance in the visible spectrum have been designed and fabricated by sputtering method. Double-layered structures consisting of very thin layer of conventional indium tin oxide (In2O3-10 mass % SnO2) and aluminum-doped indium saving indium-tin oxide layer with reduced to 50 mass % In2O3 content are discussed. Multilayer aluminum-doped ITO were deposited on glass substrates preheated at 523 K. Thin films deposited in pure argon demonstrate volume resistivity of 445 µΩcm, mobility of 26 cm2/V·s, carrier concentration of 5.6 × 1020 cm−3 and average transmittance larger than 85% in the visible range. Introducing oxygen to sputtering gas allowed increasing average transmittance of as-deposited multilayer aluminum-doped indium saving ITO thin films over 90% in the visible range. As-deposited multilayer aluminum-doped ITO thin films showed significantly higher transmittance in comparison with undoped ML ITO50/ITO90 and crystallized in In4Sn3O12 structure.
Density and surface tension measurements of molten Al–Si based alloys International-journal Peer-reviewed

Hiroyuki Fukuyama, Hideo Higashi, Masayoshi Adachi, Makoto Ohtsuka

High Temperature Materials and Processes　42　(1)　20220286-1-20220286-11　2023/01/01
Publisher: Walter de Gruyter GmbH
DOI： 10.1515/htmp-2022-0286 　

eISSN： 2191-0324

More details Close

This study is part of a series of studies aimed at measuring the thermophysical properties of molten phase change material-type metallic thermal energy storage materials near 873 K (600°C). The target material is Al–Si based alloys. First, as a feasibility study, density measurements of the molten state of three Al–Si binary alloys (Al–12.2Si, Al–50Si and Al–90Si in atomic%) were performed. A highly accurate non-contact density measurement method based on the static magnetic field superposition electromagnetic levitation (EML) method was employed as the density measurement method. The validity of this experimental method was confirmed, and density of molten Al–Si base alloys (ADC12 and Al–5.9mass%Si–1.6mass%Fe) were measured as a function of temperature with an expanded uncertainty of 1.2%. In addition, the surface tension of the alloys was measured by the droplet oscillation method using the EML technique. The surface tension was successfully obtained as a function of temperature with expanded uncertainty of 2.3%.
Dual-wavelength reflectance-ratio method for emissivity-free temperature measurements applied to electromagnetically levitated liquid Ni International-journal Peer-reviewed

Hidekazu Kobatake, Masaya Iwabuchi, Yuma Kurokawa, Makoto Ohtsuka, Masayoshi Adachi, Hiroyuki Fukuyama, Naohiko Sasajima, Yoshiro Yamada

High Temperatures-High Pressures　52　(3-4)　229-247　2023
Publisher: Old City Publishing, Inc
DOI： 10.32908/hthp.v52.1431 　

eISSN： 1472-3441

More details Close

The applicability of the dual-wavelength reflectance-ratio (DWR) method to emissivity-free radiation thermometry of electromagnetically levitated high-temperature liquid metals was investigated. To establish the measurement technique, the DWR method was applied to liquid Ni levitated in a static magnetic field, which suppresses the surface oscillation and the translational motion. In a previous study, temperature of the levitated liquid metals measured by DWR showed deviations of about 95 K to 175 K from the temperature measured by a calibrated pyrometer. Since this discrepancy could be attributed to the imperfect contribution of the auxiliary light, the effect of the optical setup of the auxiliary light on the temperature measurement was investigated in this study. By using a reflecting collimator for the auxiliary optical system and adopting the radiance ratio determined considering the geometrical arrangement of the measurement system, the difference between temperature of liquid Ni kept near its melting temperature (𝑇𝑚 = 1728 K) measured using DWR and the temperature measured by a pyrometer calibrated using the melting point of Ni was 12 K on average and the standard deviation in the temperature measurement was 25 K (𝑛 = 5).
Influence of sputtering power on optical, electrical properties and structure of aluminum-doped indium saving indium-tin oxide thin films sputtered on preheated substrates International-journal International-coauthorship Peer-reviewed

Svitlana Petrovska, Rruslan Sergiienko, Bogdan Ilkiv, Takashi Nakamura, Makoto Ohtsuka

Molecular Crystals and Liquid Crystals　751　(1)　100-108　2023/01
Publisher: Taylor and Francis Ltd
DOI： 10.1080/15421406.2022.2073534 　

ISSN： 1542-1406

eISSN： 1563-5287
Emissivity-free radiation thermometry for high-temperature metals using the dual-wavelength reflectance-ratio method International-journal Peer-reviewed

Hidekazu Kobatake, Yuma Kurokawa, Masaya Iwabuchi, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama, Naohiko Sasajima, Yu Yamaguchi, Yoshiro Yamada

Measurement Science and Technology　34　(1)　015010-1-015010-11　2022/10/20
Publisher: IOP Publishing
DOI： 10.1088/1361-6501/ac8ca3 　

ISSN： 0957-0233

eISSN： 1361-6501

More details Close

Abstract This article describes a preliminary study verifying the applicability of the dual-wavelength reflectance-ratio (DWR) method to emissivity-free radiation thermometry for electromagnetically levitated high-temperature liquid metals. To establish the measurement technique, the DWR method was applied to inductively heated solid spherical Cu and Ni samples. Regardless of the differences in the sample emissivity values, the temperature determined using the DWR method agreed within 20 K with the temperature determined using a thermocouple. It was found that the temperatures of metallic samples having different emissivity values can be determined with a standard uncertainty of 8 K in terms of the absolute temperature when applying the DWR method, even if the sample has curvature and is exposed to high temperatures of up to 1250 K.
Thermal processes of miniature thermomagnetic generators in resonant self-actuation mode International-journal International-coauthorship Peer-reviewed

Joel Joseph, Makoto Ohtsuka, Hiroyuki Miki, Manfred Kohl

iScience　25　(7)　104569-1-104569-13　2022/07
Publisher: Elsevier BV
DOI： 10.1016/j.isci.2022.104569 　

ISSN： 2589-0042

eISSN： 2589-0042
XPS Investigation of Indium-Saving Indium–Tin Oxide (ITO) Thin Films International-coauthorship Peer-reviewed

Svitlana Petrovska, Bogdan Ilkiv, Oleg Khyzhun, Makoto Ohtsuka, Rruslan Sergiienko, Leandro Voisin, Takashi Nakamura

Nanosistemi, Nanomateriali, Nanotehnologii　20　(2)　305-320　2022/06
Publisher: National Academy of Sciences of Ukraine
DOI： 10.15407/nnn.20.02.305 　

ISSN： 1816-5230

eISSN： 2617-3794
In situ observations of the dissolution of an AlN film into liquid Al using a high-temperature microscope International-journal Peer-reviewed

Masayoshi Adachi, Keigo Fujiwara, Ryuta Sekiya, Hidekazu Kobatake, Makoto Ohtsuka, Hiroyuki Fukuyama

Materials Science in Semiconductor Processing　142　106469-1-106469-6　2022/05
Publisher: Elsevier BV
DOI： 10.1016/j.mssp.2022.106469 　

ISSN： 1369-8001
Density, surface tension, and viscosity of Co-Cr-Mo melts measured using electrostatic levitation technique International-journal Peer-reviewed

Manabu Watanabe, Yuki Watanabe, Chihiro Koyama, Takehiko Ishikawa, Sayaka Imaizumi, Masayoshi Adachi, Makoto Ohtsuka, Akihiko Chiba, Yuichiro Koizumi, Hiroyuki Fukuyama

Thermochimica Acta　710　179183-1-179183-7　2022/04
Publisher: Elsevier BV
DOI： 10.1016/j.tca.2022.179183 　

ISSN： 0040-6031
Optical, Electrical Properties and Structure of Multilayer Iron-Doped Indium–Tin Oxide Thin Films Sputtered on Preheated Glass Substrates International-journal International-coauthorship Peer-reviewed

Makoto Ohtsuka, Ruslan Sergiienko, Svitlana Petrovska, Takashi Nakamura

MATERIALS TRANSACTIONS　63　(2)　224-231　2022/02/01
Publisher: Japan Institute of Metals
DOI： 10.2320/matertrans.mt-m2021133 　

ISSN： 1345-9678

eISSN： 1347-5320
Thermophysical properties of liquid Co–Cr–Mo alloys measured by electromagnetic levitation in a static magnetic field International-journal Peer-reviewed

Manabu Watanabe, Yuki Takahashi, Sayaka Imaizumi, Yufan Zhao, Masayoshi Adachi, Makoto Ohtsuka, Akihiko Chiba, Yuichiro Koizumi, Hiroyuki Fukuyama

Thermochimica Acta　708　179119-1-179119-9　2022/02
Publisher: Elsevier BV
DOI： 10.1016/j.tca.2021.179119 　

ISSN： 0040-6031
Elucidation of Gas Formation Effect on Strong Inhibition of Magnetite Dissolution in Cu₂S Through In-Situ Analysis of Reactive Interface International-journal Peer-reviewed

Seung-Hwan Shin, Sakiko Kawanishi, Sohei Sukenaga, Makoto Ohtsuka, Junichi Takahashi, Hiroyuki Shibata

Metallurgical and Materials Transactions B　52　(6)　3720-3729　2021/12
Publisher: Springer Science and Business Media LLC
DOI： 10.1007/s11663-021-02279-3 　

ISSN： 1073-5615

eISSN： 1543-1916
Effect of Oxygen Flow Rate on Properties of Aluminum-Doped Indium-Saving Indium Tin Oxide (ITO) Thin Films Sputtered on Preheated Glass Substrates International-journal International-coauthorship Peer-reviewed

Svitlana Petrovska, Ruslan Sergiienko, Bogdan Ilkiv, Takashi Nakamura, Makoto Ohtsuka

Metals　11　(10)　1604-1604　2021/10/09
Publisher: MDPI AG
DOI： 10.3390/met11101604 　

eISSN： 2075-4701
Coupling Effects in Parallel Thermomagnetic Generators Based on Resonant Self-Actuation International-journal International-coauthorship

Joel Joseph, Mira Wehr, Hiroyuki Miki, Makoto Ohtsuka, Manfred Kohl

2021 21st International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers)　463-466　2021/06/20
Publisher: IEEE
DOI： 10.1109/transducers50396.2021.9495569 　
Heusler alloy-based heat engine using pyroelectric conversion for small-scale thermal energy harvesting International-journal International-coauthorship Peer-reviewed

Mickaël Lallart, Linjuan Yan, Hiroyuki Miki, Gaël Sebald, Gildas Diguet, Makoto Ohtsuka, Manfred Kohl

Applied Energy　288　116617-1-116617-32　2021/04
Publisher: Elsevier BV
DOI： 10.1016/j.apenergy.2021.116617 　

ISSN： 0306-2619
Composition Dependence of Normal Spectral Emissivity of Liquid Ni–Al Alloys Peer-reviewed

Masayoshi Adachi, Yuji Yamagata, Manabu Watanabe, Sonoko Hamaya, Makoto Ohtsuka, Hiroyuki Fukuyama

ISIJ International　61　(3)　684-689　2021/03/15
Publisher: Iron and Steel Institute of Japan
DOI： 10.2355/isijinternational.isijint-2020-233 　

ISSN： 0915-1559

eISSN： 1347-5460
Lumped Element Model for Thermomagnetic Generators Based on Magnetic SMA Films International-coauthorship Peer-reviewed

Joel Joseph, Makoto Ohtsuka, Hiroyuki Miki, Manfred Kohl

Materials　14　(5)　1234-1-1234-13　2021/03/05
Publisher: MDPI AG
DOI： 10.3390/ma14051234 　

eISSN： 1996-1944
Upscaling of Thermomagnetic Generators Based on Heusler Alloy Films International-journal International-coauthorship Peer-reviewed

Joel Joseph, Makoto Ohtsuka, Hiroyuki Miki, Manfred Kohl

Joule　4　(12)　2718-2732　2020/12

DOI： 10.1016/j.joule.2020.10.019 　

ISSN： 2542-4351

eISSN： 2542-4351
Dynamic observation of MoSiBTiC alloy phase transitions using in situ ultrahigh-temperature X-ray diffraction measurement International-journal Peer-reviewed

Hiroyuki Fukuyama, Makoto Ohtsuka, Ryogo Sawada, Haruki Nakashima, Yasuo Ohishi, Naohisa Hirao, Masaki Takata, Kyosuke Yoshimi

Materialia　13　100867-1-100867-4　2020/09
Publisher: Elsevier BV
DOI： 10.1016/j.mtla.2020.100867 　

ISSN： 2589-1529

eISSN： 2589-1529
Metamagnetic Shape Memory Alloy Thin Plates Consolidated by Compression Shearing Method at Room Temperature for Thermal Energy Harvesting Device International-journal International-coauthorship Peer-reviewed

Hiroyuki Miki, Eijiro Abe, Sho Takeda, Makoto Ohtsuka, Manfred Kohl

Sensors and Materials　32　(8)　2867-2875　2020/08/31

DOI： 10.18494/sam.2020.2938 　

ISSN： 0914-4935
Investigation of low field response of metamagnetic Heusler alloys as multiphysic memory alloys International-journal International-coauthorship Peer-reviewed

Mickaël Lallart, Hiroyuki Miki, Linjuan Yan, Gildas Diguet, Makoto Ohtsuka

Journal of Physics D: Applied Physics　53　(34)　345002-1-345002-10　2020/08/19

DOI： 10.1088/1361-6463/ab8c7c 　

ISSN： 0022-3727

eISSN： 1361-6463
AlN formation by an Al/GaN substitution reaction International-journal Peer-reviewed

Marsetio Noorprajuda, Makoto Ohtsuka, Masayoshi Adachi, Hiroyuki Fukuyama

Scientific Reports　10　(1)　13058-1-13085-11　2020/08
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-020-69992-y 　

eISSN： 2045-2322
Multilayer indium saving ITO thin films produced by sputtering method International-journal International-coauthorship Peer-reviewed

L. Voisin, M. Ohtsuka, S. Petrovska, R. Sergiienko, T. Nakamura

Journal of Alloys and Compounds　827　154378-1-154378-7　2020/06/25

DOI： 10.1016/j.jallcom.2020.154378 　

ISSN： 0925-8388
Effect of Sputtering Power on Optoelectronic Properties of Iron-Doped Indium Saving Indium-Tin Oxide Thin Films International-journal International-coauthorship Peer-reviewed

M. Ohtsuka, R. Sergiienko, S. Petrovska, B. Ilkiv, T. Nakamura

METALLOFIZIKA I NOVEISHIE TEKHNOLOGII　41　(7)　941-952　2019/10/22
Publisher: National Academy of Sciences of Ukraine (Co. LTD Ukrinformnauka)
DOI： 10.15407/mfint.41.07.0941 　

ISSN： 1024-1809

eISSN： 1024-1809
Study of solidification pathway of a MoSiBTiC alloy by optical thermal analysis and in-situ observation with electromagnetic levitation International-journal

Hiroyuki Fukuyama, Ryogo Sawada, Haruki Nakashima, Makoto Ohtsuka, Kyosuke Yoshimi

SCIENTIFIC REPORTS　9　(1)　15049-1-15049-11　2019/10

DOI： 10.1038/s41598-019-50945-z 　

ISSN： 2045-2322

eISSN： 2045-2322
Iron-doped indium saving indium-tin oxide (ITO) thin films sputtered on preheated substrates International-coauthorship Peer-reviewed

M. Ohtsuka, R. Sergiienko, S. Petrovska, B. Ilkiv, T. Nakamura

Optik　179　(2)　19-28　2019

DOI： 10.1016/j.ijleo.2018.10.130 　

ISSN： 0030-4026
Containerless measurements of the liquid-state density of Ni-Al alloys for use as turbine blade materials Peer-reviewed

Masayoshi Adachi, Akari Sato, Sonoko Hamaya, Makoto Ohtsuka, Hiroyuki Fukuyama

SN APPLIED SCIENCES　1　(1)　18-1-18-7　2019/01

DOI： 10.1007/s42452-018-0023-x 　

ISSN： 2523-3963

eISSN： 2523-3971
Polarity inversion of AlN film grown on nitrided a-plane sapphire substrate with pulsed DC reactive sputtering Peer-reviewed

Marsetio Noorprajuda, Makoto Ohtsuka, Hiroyuki Fukuyama

AIP ADVANCES　8　(4)　045124-1-045124-11　2018/04

DOI： 10.1063/1.5024996 　

ISSN： 2158-3226

eISSN： 2158-3226
Martensitic transformation in polycrystalline substrate-constrained and freestanding Ni-Mn-Ga films with Ni and Ga excess Peer-reviewed

Shevyrtalov, S., Miki, H., Ohtsuka, M., Grunin, A., Lyatun, I., Mashirov, A., Seredina, M., Khovaylo, V., Rodionova, V.

Journal of Alloys and Compounds　741　1098-1104　2018

DOI： 10.1016/j.jallcom.2018.01.255 　

ISSN： 0925-8388
The evolution of martensitic transformation in Ni-Mn-Ga/Al<inf>2</inf>O<inf>3</inf> polycrystalline 100-nm – 2-μm films with Ni- and Ga-excess Peer-reviewed

Shevyrtalov, S., Miki, H., Ohtsuka, M., Khovaylo, V., Rodionova, V.

Journal of Alloys and Compounds　767　538-543　2018

DOI： 10.1016/j.jallcom.2018.07.144 　

ISSN： 0925-8388
Structural, optical and electrical properties of DC sputtered indium saving indium-tin oxide (ITO) thin films Peer-reviewed

Leandro Voisin, Makoto Ohtsuka, Svitlana Petrovska, Ruslan Sergiienko, Takashi Nakamura

Optik　156　(3)　728-737　2018

DOI： 10.1016/j.ijleo.2017.12.021 　

ISSN： 0030-4026
High Field X-ray Diffraction Study for Ni_46.4Mn_38.8In_12.8Co_2.0 Metamagnetic Shape Memory Film Peer-reviewed

Yoshifuru Mitsui, Keiichi Koyama, Makoto Ohtsuka, Rie Y. Umetsu, Ryosuke Kainuma, Kazuo Watanabe

METALS　7　(9)　2017/09

DOI： 10.3390/met7090364 　

ISSN： 2075-4701

eISSN： 2075-4701
High-Performance Thermomagnetic Generators Based on Heusler Alloy Films Peer-reviewed

Marcel Gueltig, Frank Wendler, Hinnerk Ossmer, Makoto Ohtsuka, Hiroyuki Miki, Toshiyuki Takagi, Manfred Kohl

ADVANCED ENERGY MATERIALS　7　(5)　1601879-1-1601879-7　2017/03

DOI： 10.1002/aenm.201601879 　

ISSN： 1614-6832

eISSN： 1614-6840
Structural and magnetic properties of magnetic shape memory alloys on Ni-Mn-Co-In self-standing films Peer-reviewed

Miki, H., Tsuchiya, K., Ohtsuka, M., Gueltig, M., Kohl, M., Takagi, T.

Advanced Structured Materials　73　149-160　2017

DOI： 10.1007/978-3-319-53306-3_11 　

ISSN： 1869-8433

eISSN： 1869-8441
Indium Saving Indium Tin Oxide thin Films Deposited by Sputtering at Room Temperature Peer-reviewed

Leandro Voisin, Makoto Ohtsuka, S. Petrovska, B. Ilkiv, R. Sergiienko, Takashi Nakamura

PHYSICS AND CHEMISTRY OF SOLID STATE　18　(1)　69-74　2017

DOI： 10.15330/pcss.18.1.69-74 　

ISSN： 1729-4428

eISSN： 2309-8589
Effect of sputtering pressure on crystalline quality and residual stress of AlN films deposited at 823K on nitrided sapphire substrates by pulsed DC reactive sputtering International-journal Peer-reviewed

Makoto Ohtsuka, Hiroto Takeuchi, Hiroyuki Fukuyama

JAPANESE JOURNAL OF APPLIED PHYSICS　55　(5)　05FD08-1-05FD08-5　2016/05

DOI： 10.7567/JJAP.55.05FD08 　

ISSN： 0021-4922

eISSN： 1347-4065
Growth mechanism of AlN crystals via thermal nitridation of sintered Al₂O₃-ZrO₂ plates Peer-reviewed

Hiroyuki Fukuyama, Mikako Kato, Yu You, Makoto Ohtsuka

CERAMICS INTERNATIONAL　42　(4)　5153-5159　2016/03

DOI： 10.1016/j.ceramint.2015.12.037 　

ISSN： 0272-8842

eISSN： 1873-3956
Effect of sputtering power on surface characteristics and crystal quality of AlN films deposited by pulsed DC reactive sputtering Peer-reviewed

Hiroto Takeuchi, Makoto Ohtsuka, Hiroyuki Fukuyama

PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS　252　(5)　1163-1171　2015/05

DOI： 10.1002/pssb.201451599 　

ISSN： 0370-1972

eISSN： 1521-3951
Thermal energy harvesting based on magnetic shape memory alloy thin films International-journal International-coauthorship Peer-reviewed

M. Gültig, M. Ohtsuka, H. Miki, T. Takagi, M. Kohl

MikroSystemTechnik Kongress 2015 "MEMS, Mikroelektronik, Systeme", Proceedings　270-273　2015
Temperature dependent magnetic and structural properties of Co₂(Fe, Ti)Ga thin films

V. Rodionova, S. Shevyrtalov, K. Chichay, A. Okubo, R. Kainuma, R. Y. Umetsu, M. Ohtsuka, A. Bozhko, V. Golub, M. Gorshenkov, M. Lyange, V. Khovaylo

Solid State Phenomena　233-234　674-677　2015
Publisher: Trans Tech Publications Ltd
DOI： 10.4028/www.scientific.net/SSP.233-234.674 　

ISSN： 1662-9779

eISSN： 1662-9779
Structural and transport properties of Ni₄₅Mn₄₀In₁₅ thin films International-journal International-coauthorship

M. V. Lyange, M. V. Gorshenkov, A. V. Bogach, M. Ohtsuka, H. Miki, T. Takagi, V. V. Khovaylo

Solid State Phenomena　233-234　670-673　2015
Publisher: Trans Tech Publications Ltd
DOI： 10.4028/www.scientific.net/SSP.233-234.670 　

ISSN： 1662-9779

eISSN： 1662-9779
Influence of substrate temperature on the crystalline quality of AlN layers deposited by RF reactive magnetron sputtering Peer-reviewed

Tomoyuki Kumada, Makoto Ohtsuka, Hiroyuki Fukuyama

AIP ADVANCES　5　(1)　017136-1-12　2015/01

DOI： 10.1063/1.4906796 　

ISSN： 2158-3226

eISSN： 2158-3226
High Frequency Thermal Energy Harvesting Using Magnetic Shape Memory Films Peer-reviewed

Marcel Gueltig, Hinnerk Ossmer, Makoto Ohtsuka, Hiroyuki Miki, Koki Tsuchiya, Toshiyuki Takagi, Manfred Kohl

ADVANCED ENERGY MATERIALS　4　(17)　1400751-1-1400751-8　2014/12

DOI： 10.1002/aenm.201400751 　

ISSN： 1614-6832

eISSN： 1614-6840
Growth of AlN Crystals on SiC Substrates by Thermal Nitridation of Al2O3 Peer-reviewed

Yu You, Makoto Ohtsuka, Hideto Miyake, Hiroyuki Fukuyama

JOURNAL OF THE AMERICAN CERAMIC SOCIETY　97　(12)　3781-3786　2014/12

DOI： 10.1111/jace.13183 　

ISSN： 0002-7820

eISSN： 1551-2916
PHASE STABILITY OF L2(1) PHASE IN Co-BASED HEUSLER ALLOYS Peer-reviewed

Rie Y. Umetsu, Akinari Okubo, Makoto Nagasako, Makoto Ohtsuka, Ryosuke Kainuma, Kiyohito Ishida

SPIN　4　(4)　1440018-1-1440018-14　2014/12

DOI： 10.1142/S2010324714400189 　

ISSN： 2010-3247

eISSN： 2010-3255
The Influence of ZrO2 Additions on Al2O3 Evaporation and AlN Crystal Growth by Thermal Nitridation of Al2O3-ZrO2 Pellets Peer-reviewed

Yu You, Mikako Kato, Makoto Ohtsuka, Hiroyuki Fukuyama

JOURNAL OF THE AMERICAN CERAMIC SOCIETY　96　(10)　3054-3060　2013/10

DOI： 10.1111/jace.12545 　

ISSN： 0002-7820

eISSN： 1551-2916
Martensitic transformation and magnetic anisotropy in Ni-Mn-Ga/NaCl(001) thin films probed by ferromagnetic resonance Peer-reviewed

I. R. Aseguinolaza, V. Golub, J. M. Barandiaran, M. Ohtsuka, P. Mueller, O. Y. Salyuk, V. A. Chernenko

Applied Physics Letters　102　(18)　182401-1-182401-4-3　2013/05

DOI： 10.1063/1.4804376 　

ISSN： 0003-6951
Influence of sputter power and N-2 gas flow ratio on crystalline quality of AlN layers deposited at 823 K by RF reactive sputtering Peer-reviewed

Tomoyuki Kumada, Makoto Ohtsuka, Kazuya Takada, Hiroyuki Fukuyama

PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 9, NO 3-4　9　(3-4)　515-518　2012

DOI： 10.1002/pssc.201100489 　

ISSN： 1862-6351

eISSN： 1610-1642
Influence of sputtering conditions on crystalline quality of AlN layers deposited by RF reactive sputtering Peer-reviewed

Tomoyuki Kumada, Makoto Ohtsuka, Kazuya Takada, Hiroyuki Fukuyama

PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 5　8　(5)　1520-1523　2011

DOI： 10.1002/pssc.201000890 　

ISSN： 1862-6351

eISSN： 1610-1642
Titanium Doped ITO Thin Films Produced by Sputtering Method Peer-reviewed

Leandro Voisin, Makoto Ohtsuka, Takashi Nakamura

MATERIALS TRANSACTIONS　51　(3)　503-509　2010/03

DOI： 10.2320/matertrans.MBW200907 　

ISSN： 1345-9678

eISSN： 1347-5320
Magnetic anisotropies in Ni-Mn-Ga films on MgO(001) substrates Peer-reviewed

V. A. Chernenko, V. Golub, J. M. Barandiaran, O. Y. Salyuk, F. Albertini, L. Righi, S. Fabbrici, M. Ohtsuka

Applied Physics Letters　96　(4)　042502-1-042502-3　2010/01

DOI： 10.1063/1.3293455 　

ISSN： 0003-6951
Imprinting Bias Stress in Functional Composites Peer-reviewed

Vladimir Khovaylo, Gor Lebedev, Dmitry Zakharov, Victor Koledov, Evgeniy Perov, Vladimir Shavrov, Makoto Ohtsuka, Vladimir Pushin, Hiroyuki Miki, Toshiyuki Takagi

JAPANESE JOURNAL OF APPLIED PHYSICS　49　(10)　100212-1-100212-3　2010

DOI： 10.1143/JJAP.49.100212 　

ISSN： 0021-4922

eISSN： 1347-4065
Magnetocaloric effect linked to the martensitic transformation in sputter-deposited Ni-Mn-Ga thin films Peer-reviewed

V. Recarte, J. I. Perez-Landazabal, V. Sanchez-Alarcos, V. A. Chernenko, M. Ohtsuka

Applied Physics Letters　95　(14)　141908-1-141908-3　2009/10

DOI： 10.1063/1.3246149 　

ISSN： 0003-6951

eISSN： 1077-3118
Intrinsic position sensing of a Ni-Mn-Ga microactuator Peer-reviewed

D. Auernhammer, M. Kohl, B. Krevet, M. Ohtsuka

Smart Materials and Structures　18　(10)　104016-1-104016-7　2009/09/10

DOI： 10.1088/0964-1726/18/10/104016 　

ISSN： 0964-1726 1361-665X

eISSN： 1361-665X
Ferromagnetic resonance properties and anisotropy of Ni-Mn-Ga thin films of different thicknesses deposited on Si substrate Peer-reviewed

Vladimir Golub, K. M. Reddy, Volodymyr Chernenko, Peter Muellner, Alex Punnoose, Makoto Ohtsuka

JOURNAL OF APPLIED PHYSICS　105　(7)　07A942-1-07A942-3　2009/04

DOI： 10.1063/1.3075395 　

ISSN： 0021-8979
Intrinsic position sensing of a Ni-Mn-Ga microactuator Peer-reviewed

Daniel Auernhammer, Manfred Kohl, Berthold Krevet, Makoto Ohtsuka

SMASIS2008: PROCEEDINGS OF THE ASME CONFERENCE ON SMART MATERIALS, ADAPTIVE STRUCTURES AND INTELLIGENT SYSTEMS - 2008, VOL 1　265-271　2009

ISSN： 2153-2001
Influence of sputtering parameters on the crystallinity and crystal orientation of AlN layers deposited by RF sputtering using the AlN target Peer-reviewed

Z. Vashaei, T. Aikawa, M. Ohtsuka, H. Kobatake, H. Fukuyama, S. Ikeda, K. Takada

Journal of Crystal Growth　311　(3)　459-462　2009/01

DOI： 10.1016/j.jcrysgro.2008.09.046 　

ISSN： 0022-0248
MFM Domain Imaging of Textured Ni-Mn-Ga/MgO(100) Thin Films Peer-reviewed

Volodymyr A. Chernenko, Ricardo Lopez Anton, Jose M. Barandiaran, Inaki Orue, Stefano Besseghini, Makoto Ohtsuka, Andrea Gambardella

IEEE TRANSACTIONS ON MAGNETICS　44　(11)　3040-3043　2008/11

DOI： 10.1109/TMAG.2008.2001652 　

ISSN： 0018-9464

eISSN： 1941-0069
Variation of atomic spacing and thermomechanical properties in Ni-Mn-Ga/alumina film composites Peer-reviewed

Stefano Besseghini, Tornmaso Cavallin, Volodymyr Chernenko, Elena Villa, Victor Lvov, Makoto Ohtsuka

ACTA MATERIALIA　56　(8)　1797-1801　2008/05

DOI： 10.1016/j.actamat.2007.12.025 　

ISSN： 1359-6454
Effects of Fe and Co addition on the magnetoresistance in Ni-Mn-Ga films Peer-reviewed

K. Koike, M. Ohtsuka, M. Matsumoto, Y. Adachi, T. Takagi, H. Kato

EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS　158　(1)　143-148　2008/05

DOI： 10.1140/epjst/e2008-00667-1 　

ISSN： 1951-6355

eISSN： 1951-6401
Magnetostructural phase transformation and shape memory effect of Fe-added Ni(2)MnGa films International-journal Peer-reviewed

Makoto Ohtsuka, Junpei Sekino, Keiichi Koyama, Toshiyuki Takagi, Kimio Itagaki

The European Physical Journal, Special Topics　158　(1)　173-178　2008/05

DOI： 10.1140/epjst/e2008-00672-4 　

ISSN： 1951-6355

eISSN： 1951-6401
Transformation behavior of Ni-Mn-Ga/Si(100) thin film composites with different film thicknesses Peer-reviewed

S. Besseghini, A. Gambardella, V. A. Chernenko, M. Hagler, C. Pohl, P. M. Muellner, M. Ohtsuka, S. Doyle

The European Physical Journal, Special Topics　158　(1)　179-185　2008/05

DOI： 10.1140/epjst/e2008-00673-3 　

ISSN： 1951-6355

eISSN： 1951-6401
NiMnGa Nanostructures Produced by Electron Beam Lithography and Ar-Ion Etching Peer-reviewed

D. Auernhammer, M. Schmitt, M. Ohtsuka, M. Kohl

The European Physical Journal, Special Topics　158　(1)　249-254　2008/05

DOI： 10.1140/epjst/e2008-00683-1 　

ISSN： 1951-6355

eISSN： 1951-6401
Properties of sputter-deposited Ni-Mn-Ga thin films Peer-reviewed

Volodymyr A. Chernenko, Stefano Besseghini, Michael Hagler, Peter Muellner, Makoto Ohtsuka, Francesco Stortiero

Materials Science and Engineering A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　481-482　(1-2 C)　271-274　2008/05

DOI： 10.1016/j.msea.2006.12.206 　

ISSN： 0921-5093
Influence of Cobalt on Phase Transitions in Ni₅₀Mn₃₇Sn₁₃ Peer-reviewed

Vladimir Vasilievich Khovaylo, Viktor Viktorovich Koledov, Vladimir Grigor''evich Shavrov, Makoto Ohtsuka, Hiroyuki Miki, Toshiyuki Takagi, Valentin Novosad

Materials Science and Engineering A - STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　481-482　(1-2 C)　322-325　2008/05

DOI： 10.1016/j.msea.2006.12.235 　

ISSN： 0921-5093
Residual stress in Ni-Mn-Ga thin films deposited on different substrates Peer-reviewed

Stephen Doyle, Volodymyr A. Chernenko, Stefano Besseghini, Andrea Gambardella, Manfred Kohl, Peter Muellner, Makoto Ohtsuka

The European Physical Journal, Special Topics　158　(1)　99-105　2008/05

DOI： 10.1140/epjst/e2008-00660-8 　

ISSN： 1951-6355

eISSN： 1951-6401
Martensitic transformation and shape memory effect under magnetic field for Ni2MnGa sputtered films containing iron International-journal Peer-reviewed

Makoto Ohtsuka, Hiroyuki Katsuyama, Minoru Matsumoto, Toshiyuki Takagi, Kimio Itagaki

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　481　(1-2 C)　275-278　2008/05

DOI： 10.1016/j.msea.2006.11.187 　

ISSN： 0921-5093
Magnetization and domain patterns in martensitic NiMnGa films on Si(100) wafer Peer-reviewed

V. A. Chernenko, R. Lopez Anton, S. Besseghini, J. M. Barandiaran, M. Ohtsuka, A. Gambardella, P. Müllner

Advanced Materials Research　52　35-43　2008
Publisher: Trans Tech Publications, Ltd.
DOI： 10.4028/0-87849-370-0.35 　

ISSN： 1022-6680

eISSN： 1662-8985
Effect of bias sputtering condition on structure of LaNi5 films Peer-reviewed

Kenta Nakakado, Makoto Ohtsuka, Yusuke Ayame, Kimio Itagaki

MATERIALS TRANSACTIONS　48　(4)　832-835　2007/04

DOI： 10.2320/matertrans.48.832 　

ISSN： 1345-9678

eISSN： 1347-5320
Magnetic susceptibility of martensitic Ni-Mn-Ga film Peer-reviewed

Volodymyr A. Chernenko, Michael Hagler, Peter Mullner, Volodymyr M. Kniazkyi, Victor A. L'vov, Makoto Ohtsuka, Stefano Besseghini

JOURNAL OF APPLIED PHYSICS　101　(5)　053909-1-053909-6　2007/03

DOI： 10.1063/1.2464188 　

ISSN： 0148-6055

eISSN： 1520-8516
Martensitic transformation and shape memory effect of Ni-rich Ni2MnGa sputtered films under magnetic field International-journal Peer-reviewed

M. Ohtsuka, M. Matsumoto, K. Koike, T. Takagi, K. Itagaki

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　310　(2)　2782-2784　2007/03

DOI： 10.1016/j.jmmm.2006.10.1048 　

ISSN： 0304-8853
Magnetoresistance of Ni-Mn-Ga-Fe ferromagnetic shape memory. lms Peer-reviewed

K. Koike, M. Ohtsuka, Y. Honda, H. Katsuyama, M. Matsumoto, K. Itagaki, Y. Adachi, H. Morita

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS　310　(2)　E996-E998　2007/03

DOI： 10.1016/j.jmmm.2006.10.1047 　

ISSN： 0304-8853
A ferromagnetic shape memory actuator designed for large 2D optical scanning Peer-reviewed

M. Kohl, D. Brugger, M. Ohtsuka, B. Krevet

SENSORS AND ACTUATORS A-PHYSICAL　135　(1)　92-98　2007/03

DOI： 10.1016/j.sna.2006.08.014 　

ISSN： 0924-4247
Texture of submicron Ni-Mn-Ga films studied by X-ray diffraction at the ANKA synchrotron source

V. A. Chernenko, S. Doyle, M. Kohl, P. Müllner, S. Besseghini, M. Ohtsuka

Zeitschrift fur Kristallographie, Supplement　2　(26)　229-234　2007

DOI： 10.1524/zksu.2007.2007.suppl_26.229 　

ISSN： 0930-486X
Texture of submicron Ni-Mn-Ga films studied by X-ray diffraction at the ANKA synchrotron source Peer-reviewed

V. A. Chernenko, S. Doyle, M. Kohl, P. Muellner, S. Besseghini, M. Ohtsuka

ZEITSCHRIFT FUR KRISTALLOGRAPHIE　26　229-234　2007

ISSN： 0044-2968
Shape memory effect and magnetostriction in polycrystalline Ni-Mn-Ga thin film microactuators International-journal International-coauthorship Peer-reviewed

M. Kohl, A. Agarwal, V. A. Chernenko, M. Ohtsuka, K. Seemann

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　438　(SPEC. ISS.)　940-943　2006/12

DOI： 10.1016/j.msea.2006.02.062 　

ISSN： 0921-5093
Thickness dependence of transformation characteristics of Ni-Mn-Ga thin films deposited on alumina: Experiment and modeling International-journal International-coauthorship Peer-reviewed

V. A. Chernenko, M. Kohl, M. Ohtsuka, T. Takagi, V. A. L'vov, V. M. Kniazkyi

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　438　(SPEC. ISS.)　944-947　2006/12

DOI： 10.1016/j.msea.2006.02.055 　

ISSN： 0921-5093
Structural and magnetic characterization of martensitic Ni-Mn-Ga thin films deposited on Mo foil Peer-reviewed

V. A. Chernenko, R. Lopez Anton, M. Kohl, J. M. Barandiaran, M. Ohtsuka, I. Orue, S. Besseghini

ACTA MATERIALIA　54　(20)　5461-5467　2006/12

DOI： 10.1016/j.actamat.2006.06.058 　

ISSN： 1359-6454
Two-way shape memory behavior of sputter-deposited Ni-rich Ni2MnGa films International-journal Peer-reviewed

Makoto Ohtsuka, Minoru Matsumoto, Kimio Itagaki

JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES　17　(12)　1069-1074　2006/12

DOI： 10.1177/1045389X06064606 　

ISSN： 1045-389X

eISSN： 1530-8138
Effect of iron and cobalt addition on magnetic and shape memory properties of Ni₂MnGa sputtered films International-journal Peer-reviewed

Makoto Ohtsuka, Minoru Matsumoto, Kimio Itagaki

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　438　(SPEC. ISS.)　935-939　2006/12

DOI： 10.1016/j.msea.2006.02.153 　

ISSN： 0921-5093
Texture and transformation characteristics of Ni-Mn-Ga films deposited on alumina Peer-reviewed

Chernenko, V, M Kohl, S Doyle, P Mullner, M Ohtsuka

SCRIPTA MATERIALIA　54　(7)　1287-1291　2006/04

DOI： 10.1016/j.scriptamat.2005.12.020 　

ISSN： 1359-6462
Ni-Mn-Sn: Novel Ferromagnetic Shape Memory Alloys Peer-reviewed

Vladimir V. Khovailo, Viktor V. Koledov, Vladimir G. Shavrov, A. Korolyov, Makoto Ohtsuka, O. Savel'eva, Toshiyuki Takagi

Functional Materials　13　(3)　474-477　2006/04
Martensitic transformation and microstructure of sputter-deposited Ni-Mn-Ga films Peer-reviewed

Volodymyr A. Chernenko, Manfred Kohl, Victor A. L'vov, Volodymyr M. Kniazkyi, Makoto Ohtsuka, Oliver Kraft

MATERIALS TRANSACTIONS　47　(3)　619-624　2006/03

DOI： 10.2320/matertrans.47.619 　

ISSN： 1345-9678

eISSN： 1347-5320
Ferromagnetic shape memory microactuators Peer-reviewed

Manfred Kohl, Berthold Krevet, Makoto Ohtsuka, Daniel Brugger, Yong Liu

MATERIALS TRANSACTIONS　47　(3)　639-644　2006/03

DOI： 10.2320/matertrans.47.639 　

ISSN： 1345-9678

eISSN： 1347-5320
Magnetic-field induced two-way shape memory effect of ferromagnetic Ni2MnGa sputtered films Peer-reviewed

Makoto Ohtsuka, Yuya Konno, Minoru Matsumoto, Toshiyuki Takagi, Kimio Itagaki

MATERIALS TRANSACTIONS　47　(3)　625-630　2006/03

DOI： 10.2320/matertrans.47.625 　

ISSN： 1345-9678

eISSN： 1347-5320
Phase transitions in Ni2+xMn1-xGa with a high Ni excess Peer-reviewed

VV Khovaylo, VD Buchelnikov, R Kainuma, VV Koledov, M Ohtsuka, VG Shavrov, T Takagi, SV Taskaev, AN Vasiliev

PHYSICAL REVIEW B　72　(22)　224408-1-224408-10　2005/12

DOI： 10.1103/PhysRevB.72.224408 　

ISSN： 1098-0121

eISSN： 1550-235X
Phase relations in the Ni-Mn-Ga ternary system and aging effect on shape memory properties of ferromagnetic Ni2MnGa sputtered films Peer-reviewed

M Ohtsuka, C Wedel, K Itagaki

MONATSHEFTE FUR CHEMIE　136　(11)　1909-1914　2005/11

DOI： 10.1007/s00706-005-0382-z 　

ISSN： 0026-9247
Transformation behavior of Ni-Mn-Ga thin films Peer-reviewed

VA Chernenko, M Ohtsuka, M Kohl, VV Khovailo, T Takagi

SMART MATERIALS & STRUCTURES　14　(5)　S245-S252　2005/10

DOI： 10.1088/0964-1726/14/5/012 　

ISSN： 0964-1726
Magnetic domains in Ni-Mn-Ga martensitic thin films Peer-reviewed

VA Chernenko, RL Anton, M Kohl, M Ohtsuka, Orue, I, JM Barandiaran

JOURNAL OF PHYSICS-CONDENSED MATTER　17　(34)　5215-5224　2005/08

DOI： 10.1088/0953-8984/17/34/006 　

ISSN： 0953-8984
Effects of Composition and Structure on Mechanical Properties of Polycrystalline Ni₂MnGa Alloy Peer-reviewed

Hiroyuki Ogasawara, Makoto Ohtsuka, Minoru Matsumoto, Kimio Itagaki

Transaction of the Materials Research Society of Japan　29　(7)　3029-3032　2004/11
Relation between Composition and Shape Memory Effect of the Sputtered Films of Ferromagnetic Shape Memory Alloy Ni₂MnGa Peer-reviewed

Yuya Konno, Makoto Ohtsuka, Minoru Matsumoto, Kimio Itagaki

Transaction of the Materials Research Society of Japan　29　(7)　3033-3036　2004/11
Development of High-temperature Shape Memory Alloys Ni_2+xMn_1-xGa System Peer-reviewed

Vladimir V. Khovailo, Toshihiko Abe, Toshiyuki Takagi, Makoto Ohtsuka, Minoru Matsumoto

Transactions of the Materials Research Society of Japan　29　(7)　3063-3066　2004/11
A novel actuation mechanism on the basis of ferromagnetic SMA thin films Peer-reviewed

M Kohl, D Brugger, M Ohtsuka, T Takagi

SENSORS AND ACTUATORS A-PHYSICAL　114　(2-3)　445-450　2004/09

DOI： 10.1016/j.sna.2003.11.006 　

ISSN： 0924-4247
Magnetic-field induced shape memory effect in Ni₂MnGa sputtered films International-journal Peer-reviewed

M Ohtsuka, M Sanada, M Matsumoto, K Itagaki

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING　378　(1-2)　377-383　2004/07

DOI： 10.1016/j.msea.2003.11.077 　

ISSN： 0921-5093
SMA microactuators for microvalve applications International-journal International-coauthorship Peer-reviewed

M Kohl, Y Liu, B Krevet, S Durr, M Ohtsuka

JOURNAL DE PHYSIQUE IV　115　333-342　2004/06

DOI： 10.1051/jp4:2004115039 　

ISSN： 1155-4339

eISSN： 1764-7177
Effect of Cobalt Addition on Shape Memory Properties of Ferromagnetic Ni-Mn-Ga Sputtered Films Peer-reviewed

Yoshiharu Katano, Makoto Ohtsuka, Minoru Matsumoto, Kunihiro Koike, Kimio Itagaki

Materials Transactions　45　(2)　350-352　2004
Publisher: Japan Institute of Metals (JIM)
DOI： 10.2320/matertrans.45.350 　

ISSN： 1345-9678
Magnetic-field Controlled Two-way Shape Memory Effect of Ni₂MnGa Sputtered Films Peer-reviewed

Masaki Sanada, Makoto Ohtsuka, Minoru, Matsumoto, Toshiyuki Takagi, Kimio Itagaki

Transactions of the Materials Research Society of Japan　28　(5)　663-666　2003/04
Two-way Shape Memory Behavior of Ni2MnGa Sputtered Films International-journal Peer-reviewed

Makoto Ohtsuka, Minoru Matsumoto, Kimio Itagaki

Transactions of the Materials Research Society of Japan　28　(5)　659-662　2003/04
Two-way shape memory effect of ferromagnetic Ni-Mn-Ga sputter-deposited films International-journal Peer-reviewed

M. Ohtsuka, M. Matsumoto, K. Itagaki

Metallurgical and Materials Processing : Principles and Technologies　1　1213-1226　2003
Magnetic domain structure in Ni_53.6Mn_23.4Ga_23.0 shape memory alloy films studied by electron holography and Lorentz microscopy International-journal Peer-reviewed

Y Murakami, D Shindo, A Suzuki, A Ohtsuka, K Itagaki

ACTA MATERIALIA　51　(2)　485-494　2003/01

DOI： 10.1016/S1359-6454(02)00431-7 　

ISSN： 1359-6454

eISSN： 1873-2453
Influence of Fe and Co on phase transitions in Ni-Mn-Ga alloys International-journal International-coauthorship Peer-reviewed

Vladimir V. Khovailo, Toshihiko Abe, Viktor V. Koledov, Minoru Matsumoto, Hirokazu Nakamura, Ryunosuke Note, Makoto Ohtsuka, Vladimir G. Shavrov, Toshiyuki Takagi

Materials Transactions　44　(12)　2509-2512　2003
Publisher: Japan Institute of Metals (JIM)
DOI： 10.2320/matertrans.44.2509 　

ISSN： 1345-9678
Shape memory behavior of Ni-Mn-Ga sputtered films under a magnetic field International-journal Peer-reviewed

Makoto Ohtsuka, Masaki Sanada, Minoru Matsumoto, Toshiyuki Takagi, Kimio Itagaki

Materials Transactions　44　(12)　2513-2519　2003
Publisher: Japan Institute of Metals (JIM)
DOI： 10.2320/matertrans.44.2513 　

ISSN： 1345-9678
Effect of aging time on shape memory properties of sputtered Ni-rich Ni₂MnGa alloy films Peer-reviewed

Motohiko Suzuki, Makoto Ohtsuka, Minoru Matsumoto, Yasukazu Murakami, Daisuke Shindo, Kimio Itagaki

Materials Transactions　43　(5)　861-866　2002/05

DOI： 10.2320/matertrans.43.861 　

ISSN： 1345-9678
Two-way Shape Memory Effect of Sputtered Ni-rich Ni₂MnGa Films International-journal Peer-reviewed

Makoto Ohtsuka, Minoru Matsumoto, Kimio Itagaki

Transactions of the Materials Research Society of Japan　26　(1)　201-204　2001/04
Phase Transformation of Sputtered Ni-richi Ni₂MnGa Films Peer-reviewed

Kiyoshi Ohi, Shinji Isokawa, Makoto Ohtsuka, Minoru Matsumoto, Kimio Itagaki

Transactions of the Materials Research Society of Japan　26　(1)　291-294　2001/04
Fabrication and Characterization of Hydrogen Absorption LaNi₅ Alloy Films Sputtered on Nickel Substrate International-journal Peer-reviewed

Makoto Ohtsuka, Yoshihiko Takeda, Tadayuki Kobayashi, Kimio Itagaki

Zeitschrift für Metallkunde　92　(10)　1134-1138　2001/04
Publisher: CARL HANSER VERLAG
ISSN： 0044-3093
Mechanical and shape memory properties of ferromagnetic Ni_2+xMn_1-xGa alloys International-journal Peer-reviewed

T Takagi, Khovailo, V, T Nagatomo, M Matsumoto, M Ohtsuka, T Abe, H Miki

APPLIED ELECTROMAGNETICS (III)　10　412-415　2001

ISSN： 1343-2869
Shape memory effect of sputtered Ni-rich Ni₂MnGa alloy films aged in constraint condition International-journal Peer-reviewed

S. Isokawa, M. Suzuki, M. Ohtsuka, M. Matsumoto, K. Itagaki

Materials Transactions　42　(9)　1886-1889　2001
Publisher: Japan Institute of Metals (JIM)
DOI： 10.2320/matertrans.42.1886 　

ISSN： 1345-9678
Effect of heat treatment on properties of Ni-Mn-Ga films prepared by a sputtering method Peer-reviewed

M. Ohtsuka, K. Itagaki

INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS　12　(1-2)　49-59　2000

DOI： 10.3233/jae-2000-194 　

ISSN： 1383-5416
Fabrication and characterization of sputtered Ni₂MnGa thin films International-journal Peer-reviewed

Masaya Suzuki, Makoto Ohtsuka, Takanobu Suzuki, Minoru Matsumoto, Hiroyuki Miki

Materials Transactions, JIM　40　(10)　1174-1177　1999
Publisher: Japan Institute of Metals (JIM)
DOI： 10.2320/matertrans1989.40.1174 　

ISSN： 0916-1821
Microstructure and Hydrogen-Absorption Properties of Zr-Ni-Mn Ternary Alloys Peer-reviewed

OHTSUKA Makoto, YAMAUCHI Terukazu, ITAGAKI Kimio

Journal of the Japan Institute of Metals and Materials　61　(8)　774-780　1997/08/20

DOI： 10.2320/jinstmet1952.61.8_774 　

ISSN： 0021-4876

eISSN： 1880-6880
Creep behavior and substructures of alpha₂ Ti-34mol%Al intermetallics Peer-reviewed

Y Nagae, T Fukuda, M Ohtsuka, H Sato, H Oikawa

INTERMETALLICS　5　(4)　321-328　1997

DOI： 10.1016/S0966-9795(96)00096-9 　

ISSN： 0966-9795
Formation of RE_xNi_y (RE = La, Ce, Pr or ND) compounds by calciothermic reduction of La₂O₃, CeO₂, Pr₆O₁₁ and Nd₂O₃ Peer-reviewed

M. Ohtsuka, D. Y. Kim, K. Itagaki

Journal of Alloys and Compounds　230　(1)　46-52　1995/11/15

DOI： 10.1016/0925-8388(95)01885-9 　

ISSN： 0925-8388
HEAT-CONTENT AND HEAT OF FORMATION MEASUREMENTS OF RNI(5+/-X) ALLOYS (R-LA, CE, PR OR ND) AND HEAT-BALANCE IN A REDUCTION-DIFFUSION PROCESS

K YAMAGUCHI, DY KIM, M OHTSUKA, K ITAGAKI

JOURNAL OF ALLOYS AND COMPOUNDS　221　(1-2)　161-168　1995/04

DOI： 10.1016/0925-8388(94)01422-1 　

ISSN： 0925-8388

eISSN： 1873-4669
Ni-RE(RE=Ce,Pr,Nd)2元系合金の反応拡散に関する研究 Peer-reviewed

金徳寧, 大塚誠, 板垣乙未生

資源と素材　110　(2)　p95-101　1994/02
Publisher: 資源・素材学会
ISSN： 0916-1740
Creep Behavior and Substructures of alpha₂-Ti-27 mol％Al Intermetallics Peer-reviewed

M. OHTSUKA, T. FUKUDA, H. OIKAWA

STRENGTH OF MATERIALS　733-736　1994
Reactive diffusion in Ni - RE (RE = Ce, Pr, Nd) binary alloys

Kim, Deog-Yung, Ohtsuka, Makoto, Itagaki, Kimio

Metallurgical Review of MMIJ (Mining and Metallurgical Institute of Japan)　10　(1)　25-45　1993/09/01

ISSN： 0289-6214
ニッケル-ランタン2元系合金の反応拡散に関する研究 (素材小特集-4-界面反応と材料特性) Peer-reviewed

金悳寧, 大塚誠, 板垣乙未生

資源と素材　108　(12)　p873-878　1992/12
Publisher: 資源・素材学会
ISSN： 0916-1740
Study on Reactive Diffusion in the Nickel-Lanthanum Binary Alloy. Peer-reviewed

Deog-Yung KIM, Makoto OHTSUKA, Kimio ITAGAKI

Metallurgical Review of MMIJ　9　(2)　1-17　1992/04

Show all ︎Show first 5

Misc. 208

Thermophysical property measurements of Cu₂S and FeS melts using levitation techniques

安達正芳, 正岡諒也, 大塚誠, 渡邉匡人, 高橋純一, 福山博之

資源・素材(Web)　2021　2021
金属素描 No. 10 インジウム (Indium) [in Japanese]

Makoto OHTSUKA

Materia Japan　59　(7)　351-351　2020/07/01
Publisher: Japan Institute of Metals
DOI： 10.2320/materia.59.351 　

ISSN： 1340-2625

eISSN： 1884-5843
思い出の教科書，この一冊！ “初級金属学” [in Japanese]

Makoto OHTSUKA

Materia Japan　59　(5)　266-266　2020/05/01
Publisher: Japan Institute of Metals
DOI： 10.2320/materia.59.266 　

ISSN： 1340-2625

eISSN： 1884-5843
Preface to Special Issue on Cutting Edge of Computational Materials Science on Microstructure

Materia Japan　59　(3)　127-127　2020/03/01
Publisher: Japan Institute of Metals
DOI： 10.2320/materia.59.127 　
In-situ observation of AlN crystal growth on Fe-Al melts

山形武史, 安達正芳, 大塚誠, 福山博之

材料とプロセス(CD-ROM)　33　(1)　2020

ISSN： 1882-8922
Thermophysical property measurement of Cu₂S melts using conical nozzle levitation technique

安達正芳, 後藤宏樹, 大塚誠, 渡邉匡人, 高橋純一, 福山博之

資源・素材(Web)　2020　2020
企画にあたって連載「思い出の教科書，この一冊！」 [in Japanese]

Materia Japan　59　(1)　50-50　2020/01/01
Publisher: Japan Institute of Metals
DOI： 10.2320/materia.59.50 　

ISSN： 1340-2625

eISSN： 1884-5843
静磁場印加電磁浮遊法を用いた溶融Co‐Cr‐Mo系合金の熱伝導率測定

大塚誠, 高橋侑希, 小泉雄一郎, 趙宇凡, 千葉晶彦, 福山博之

日本金属学会講演概要(CD-ROM)　164th　ROMBUNNO.247　2019/03/06

ISSN： 2433-3093
Material Modification of Shape Memory Alloy for Actuator Applications International-coauthorship

Hiroyuki MIKI, Sho TAKEDA, Makoto OHTSUKA, Marcel GÜLTIG, Manfred KOHL, Hiroyuki KOSUKEGAWA, Toshiyuki TAKAGI

The Proceedings of the Materials and Mechanics Conference　2019　(0)　OS2204-OS2204　2019
Publisher: Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemm.2019.os2204 　

eISSN： 2424-2845

More details Close

In the process of downsizing and/or energy saving of actuators and devices, the application of functional materials has attracted attention in addition to the optimizing of design and system. Functional materials are the materials that have some additional responsiveness to electricity, magnetic field, light ,heat, etc. in addition to the function of the structural material. Shape memory materials are the materials that memorize a certain shape and returns to the original shape under certain conditions after deformation. In recent years, new shape memory alloys which have a different properties from the conventional types, such as higher performance, quick response and high durability etc., are developed, and applied research has been actively conducted on shape memory alloys due to their practicality. For improving the characteristics of shape memory alloys and taking advantage of these characteristics, a technique for adding some processing to the materials has been proposed in this paper. Such material modification aims to expand the application area of shape memory alloys and improve the characteristics of the actuator and device using shape memory alloys. The coating technique aiming at biomedical applications using carbon-based thin films, and the powder molding technique by severe plastic deformation aiming at improvement of material strength and magnetic property are reported.
Cu₂S融体の非接触熱物性測定

安達正芳, 後藤宏基, 大塚誠, 高橋純一, 福山博之

資源・素材(Web)　2019　ROMBUNNO.1K0401‐07‐03 (WEB ONLY)　2019
Normal spectral emissivity measurement of molten Ni‐Al alloys

山片裕司, 大塚誠, 安達正芳, 福山博之

Thermophysical Properties　39th　64‐66　2018/11/13

ISSN： 0911-1743
EMISIVITY‐FREE TEMPERATURE MESUREMENT OF ELECTROMAGNETICALLY LEVITATED LIQUID METALS BY DUAL‐WAVELENGTH REFLECTANCE‐RATIO METHOD

岩渕将也, 大塚誠, 福山博之, 小畠秀和, 笹嶋尚彦, 山田善郎

Thermophysical Properties　39th　76‐78　2018/11/13

ISSN： 0911-1743
Ni‐Mn‐X(X=Ga,In)強磁性形状記憶合金膜の高機能化と新規デバイスへの展開

大塚誠

日本金属学会講演概要(CD-ROM)　163rd　ROMBUNNO.507　2018/09/05

ISSN： 2433-3093
静磁場印加電磁浮遊法を用いた溶融Co‐Cr‐Mo系合金の垂直分光放射率および定圧モル熱容量測定

高橋侑希, 大塚誠, 小泉雄一郎, 趙宇凡, 千葉晶彦, 福山博之

日本金属学会講演概要(CD-ROM)　163rd　ROMBUNNO.126　2018/09/05

ISSN： 2433-3093
電磁浮遊法を用いた溶融Ni‐AlからのAlN生成その場観察

安達正芳, 浜谷苑子, 山片裕司, 大塚誠, 福山博之

応用物理学会春季学術講演会講演予稿集(CD-ROM)　65th　ROMBUNNO.18p‐E202‐8　2018/03/05
Co‐Cr‐Mo系合金の液相線温度と溶融状態における密度の評価

高橋侑希, 大塚誠, 小泉雄一郎, 趙宇凡, 千葉晶彦, 福山博之

日本金属学会講演概要(CD-ROM)　162nd　ROMBUNNO.S2.18　2018/03/05

ISSN： 2433-3093
黒体放射を用いた熱分析法による10mol%TiC含有Mo_ss‐T₂‐TiC合金の高温状態図の検討

澤田龍伍, 中島治樹, 大塚誠, 宮田龍一, 吉見享祐, 福山博之

日本金属学会講演概要(CD-ROM)　162nd　ROMBUNNO.16　2018/03/05

ISSN： 2433-3093
2波長反射率比法による電磁浮遊金属液滴の温度測定

岩渕将也, 黒川佑馬, 小畠秀和, 大塚誠, 福山博之, 笹嶋尚彦, 山口祐, 山田善郎

日本金属学会講演概要(CD-ROM)　162nd　ROMBUNNO.P48　2018/03/05

ISSN： 2433-3093
静磁場印加電磁浮遊法を用いたMo_ss初晶MoSiBTiC合金浮遊液滴の凝固組織

大塚誠, 中島治樹, 澤田龍伍, 宮田龍一, 吉見享祐, 福山博之

日本金属学会講演概要(CD-ROM)　162nd　ROMBUNNO.15　2018/03/05

ISSN： 2433-3093
MIniature-Scale Energy GeneraTion by Magnetic Shape MemoRy ALloys

Manfred KOHL, Hiroyuki MIKI, Mickaël Lallart, Marcel GUELTIG, Makoto OHTSUKA

ELyT Workshop 2018 9th annual workshop　2018/03
Ni‐C共晶点による分光器の校正と溶融Ni‐Al合金の垂直分光放射率測定

山片裕司, 大塚誠, 安達正芳, 福山博之

材料とプロセス(CD-ROM)　31　(1)　ROMBUNNO.39　2018/03/01

ISSN： 1882-8922
静磁場印加電磁浮遊法を用いた溶融Ti‐6Al‐4V合金の密度・蒸発速度測定

船田卓, 大塚誠, 福山博之

材料とプロセス(CD-ROM)　31　(1)　ROMBUNNO.40　2018/03/01

ISSN： 1882-8922
Application of Dual-Wavelength Reflectance-Ratio Method to Electromagnetic Levitated Liquid Metals Peer-reviewed

M. Iwabuchi, Y. Kurokawa, H. Kobatake, M. Ohtsuka, H. Fukuyama, Y. Yamaguchi, N. Sasajima, Y. Yamada

Proc. SICE Ann. Conf.　161-1--3　2018
Frontier of Ultra-precise Additive Manufacturing for Metallic Materials [in Japanese]

Umetsu Rie Y., Ohtsuka Makoto, Teranishi Ryo

Materia Japan　56　(12)　685-685　2017/12
Publisher: The Japan Institute of Metals and Materials
DOI： 10.2320/materia.56.685 　

ISSN： 1340-2625
Improvement in Magnetic Properties of Metamagnetic Shape Memory Alloy Processed by Compression Shearing Method at Room Temperature Peer-reviewed

Hiroyuki Miki, Koki Tsuchiya, Eijiro Abe, Sho Takeda, Makoto Ohtsuka, Marcel Gueltig, Manfred Kohl, Toshiyuki Takagi

14th International Conference on Flow Dynamics (ICFD 2017)　664-665　2017/11/01

More details Close

1750
黒体放射を用いた超高温熱分析法によるMoSiBTiC合金の状態図作成

澤田龍伍, 中島治樹, 大塚誠, 福山博之, 吉見享祐

日本金属学会講演概要(CD-ROM)　161st　ROMBUNNO.S1.20　2017/08/23

ISSN： 2433-3093
MARTENSITIC TRANSFORMATION AND MAGNETIC PROPERTIES IN

Shevyrtalov S, Miki H, Ohtsuka M, Mashirov A, Grunin A, Lyatun I, Seredina M, Khovaylo V, Rodionova V

Moscow International Symposium on Magnetism Book of Abstracts　842　2017/07/04
Recent Developments in Electronic and Information Materials for Meeting the Social and Industry Demands

Shun Fujieda, Makoto Ohtsuka, Shinji Muranishi, Saeki Yamamuro, Rie Umetsu, Yojiro Oba, Ryo Teranishi

Materia Japan　56　(3)　180-180　2017/03
Publisher: Japan Institute of Metals
DOI： 10.2320/materia.56.180 　

ISSN： 1340-2625

eISSN： 1884-5843
黒体放射を用いた超高温熱分析装置の開発とMo系合金への適用

澤田龍伍, 中島治樹, 大塚誠, 福山博之, 富樫陽色, 吉見享祐

日本金属学会講演概要(CD-ROM)　160th　ROMBUNNO.P83　2017/03/01

ISSN： 2433-3093
溶融MoSiBTiC合金の冷却過程における多段階復熱現象と凝固組織の関係

中島治樹, 大塚誠, 福山博之, 富樫陽色, 吉見享祐

日本金属学会講演概要(CD-ROM)　160th　ROMBUNNO.62　2017/03/01

ISSN： 2433-3093
2波長反射率比法による放射率フリー温度計測の高温球状金属への適用

黒川佑馬, 大塚誠, 福山博之, 小畠秀和, 山田善郎, 笹嶋尚彦, 山口祐

日本金属学会東北支部研究発表大会予稿集　16th　33　2017
Application of Ni-Mn-In based Magnetic Shape Memory Alloy Plates for Energy Harvesting Device

Hiroyuki Miki, Eijiro Abe, Sho Takeda, Makoto Ohtsuka, Marcel Gueltig, Manfred Kohl, Toshiyuki Takagi

Proceedings of JSPS Core-to-Core Program 6th Workshop The 2nd NUAA Tohoku University Joint Symposium on Fluid Science, Aerospace Engineering and Smart Structure Technology　45-46　2016/10/11
常温圧縮せん断法により作製されたNi‐Mn‐In系合金薄板材を利用した環境発電素子の特性向上のためのデバイス設計

大塚誠, 阿部英次郎, 三木寛之, GUETIG Marcel, KOHL Manfred, 高木敏行

日本金属学会講演概要(CD-ROM)　159th　ROMBUNNO.S3.13　2016/09/07

ISSN： 2433-3093
MoSiBTiC合金の液相線温度と溶融状態の密度に及ぼすTiC添加の影響

中島治樹, 大塚誠, 東英生, 福山博之, 富樫陽色, 吉見享祐

日本金属学会講演概要(CD-ROM)　159th　ROMBUNNO.S1.36　2016/09/07

ISSN： 2433-3093
Development of Ni-Mn-In Type Magnetic Shape Memory Alloy Thin Plate for Magnetically-Actuated Devices

Hiroyuki Miki, Koki Tsuchiya, Eijiro Abe, Makoto Ohtsuka, Marcel Gueltig, Manfred Kohl, Toshiyuki Takagi

5th International Conference on Ferromagnetic Shape Memory Alloys (ICFSMA '16)　97-98　2016/09/05

More details Close

1687
Magnetic Shape Memory Films for Thermal Energy Harvesting

Manfred Kohl, Marcel Gültig, Hiroyuki Miki, Makoto Ohtsuka, Toshiyuki Takagi, Hinnerk Ossmer

5th International Conference on Ferromagnetic Shape Memory Alloys (ICFSMA '16)　95-96　2016/09/05

More details Close

1686
アルミナ炭素熱還元法を利用したAlN単結晶成長に及ぼすグラファイト添加量および反応温度の影響

大塚誠, 藤原圭吾, 三宅秀人, 福山博之

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　77th　ROMBUNNO.13a‐A21‐3　2016/09/01
MoSiBTiC合金の液相線温度の決定と静磁場印加電磁浮遊法による溶融状態の密度測定

中島治樹, 東英生, 大塚誠, 福山博之, 富樫陽色, 吉見享祐

日本金属学会講演概要(CD-ROM)　158th　ROMBUNNO.280　2016/03/09

ISSN： 2433-3093
アルミナ炭素熱還元法によるAlNバッファ層上へのAlN単結晶成長

藤原圭吾, 大塚誠, 福山博之

日本金属学会講演概要(CD-ROM)　158th　ROMBUNNO.135　2016/03/09

ISSN： 2433-3093
圧縮せん断法により作製されたNi‐Mn‐In系合金薄板材を利用した環境発電素子の特性向上

大塚誠, 阿部英次郎, 三木寛之, GUETIG Marcel, KOHL Manfred, 高木敏行

日本金属学会講演概要(CD-ROM)　158th　ROMBUNNO.111　2016/03/09

ISSN： 2433-3093
溶融Ni‐Al合金の高精度密度測定と過剰体積の評価

佐藤明香輪, 東英生, 安達正芳, 大塚誠, 福山博之

材料とプロセス(CD-ROM)　29　(1)　ROMBUNNO.69　2016/03/01

ISSN： 1882-8922
146 Application of Ni-Mn-In based Magnetic Shape Memory Alloy Plates made by Dynamic Molding Method to Energy Harvesting Device

ABE Eijiro, MIKI Hiroyuki, OHTSUKA Makoto, TAKEDA Sho, TAKAGI Toshiyuki

The Proceedings of Conference of Tohoku Branch　2016　(0)　89-90　2016
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeth.2016.51.89 　
動的加工法によるNi‐Mn‐In系磁性形状記憶合金薄板材の成型と環境発電素子への応用

阿部英次郎, 三木寛之, 大塚誠, 武田翔, 高木敏行

日本機械学会東北支部総会・講演会講演論文集(CD-ROM)　51st　ROMBUNNO.146　2016
メタ磁性形状記憶合金粉末の圧縮せん断成形と環境発電素子適用の検討

阿部英次郎, GUELTIG Marcel, OSSMER Hinnerk, KOHL Manfred, 三木寛之, 大塚誠, 高木敏行

MAGDAコンファレンス講演論文集　24th　165-168　2015/11/12
Metamagnetic Shape Memory Alloy Plate for Energy Harvesting Device Peer-reviewed

Hiroyuki Miki, Koki Tsuchiya, Eijiro Abe, Makoto Ohtsuka, Marcel Gueltig, Hinnerk Ossmer, Manfred Kohl, Toshiyuki Takagi

Twelfth International Conference on Flow Dynamics (ICFD 2015)　852-853　2015/10/27

More details Close

1618
溶融Ni‐Al合金密度の温度及び組成依存性

佐藤明香輪, 東英生, 安達正芳, 大塚誠, 福山博之

Thermophysical Properties　36th　24-26　2015/10/19

ISSN： 0911-1743
溶融MoSiBTiC合金の静磁場中電磁浮遊と密度計測

福山博之, 中島治樹, 東英生, 大塚誠, 富樫陽色, 吉見享祐

日本金属学会講演概要(CD-ROM)　157th　ROMBUNNO.409　2015/09/02

ISSN： 2433-3093
Co添加Ni‐Mn‐In合金スパッタ膜を利用した環境発電素子の開発

大塚誠, GUELTIG Marcel, KOHL Manfred, 阿部英次郎, 土屋光樹, 三木寛之, 高木敏行

日本金属学会講演概要(CD-ROM)　157th　ROMBUNNO.S4.18　2015/09/02

ISSN： 2433-3093
Al₂O₃炭素熱還元法における炭素量の原料分解蒸発及びAlN結晶成長に及ぼす影響

藤原圭吾, 大塚誠, 福山博之

日本金属学会講演概要(CD-ROM)　157th　ROMBUNNO.P118　2015/09/02

ISSN： 2433-3093
静磁場印加電磁浮遊法による溶融Ni‐Al合金の密度測定

佐藤明香輪, 大塚誠, 東英生, 福山博之

材料とプロセス(CD-ROM)　28　(2)　ROMBUNNO.63　2015/09/01

ISSN： 1882-8922
Ni-Mn-In Type Magnetic Shape Memory Alloy Thin Plates for Magnetically Actuated Devices Invited

Hiroyuki Miki, Koki Tsuchiya, Eijiro Abe, Makoto Ohtsuka, Marcel Gueltig, Hinnerk Ossmer, Manfred Kohl, Toshiyuki Takagi

Proceedings of the 1st NUAA-Tohoku University Joint Symposium on Fluid Science, Aerospace Engineering and Smart Structure Technology　38　2015/06/21
Thermal Energy Harvesting by High Frequency Actuation of Magnetic Shape Memory Alloy Films Peer-reviewed

Marcel Gueltig, Makoto Ohtsuka, Hiroyuki Miki, Toshiyuki Takagi, Manfred Kohl

18th International Conference on Solid-State Sensors, Actuators and Microsystems (Transducers 2015)　718-721　2015/06/01

DOI： 10.1109/TRANSDUCERS.2015.7181024 　
Thermal Energy Harvesting Based on Metamagnetic Shape Memory Alloys

Marcel Gueltig, Miki, Hiroyuki, Makoto Ohtsuka, Toshiyuki Takagi, Manfred Kohl

Book of Abstracts Energy, Science and Technology 2015　98　2015/05/20
強磁性形状記憶合金スパッタ膜を利用した環境発電素子の開発

大塚誠, GUELTIG Marcel, KOHL Manfred, 阿部英次郎, 三木寛之, 高木敏行

日本金属学会講演概要(CD-ROM)　156th　ROMBUNNO.1　2015/03/04

ISSN： 2433-3093
Al₂O₃の炭素熱還元法における反応温度及び反応時間の影響

藤原圭吾, 大塚誠, 福山博之

日本金属学会講演概要(CD-ROM)　156th　ROMBUNNO.P17　2015/03/04

ISSN： 2433-3093
反応性パルスDCスパッタ法により作製されたAlN膜の結晶性および表面構造に及ぼすスパッタ電力の影響

竹内洋仁, 大塚誠, 福山博之

応用物理学会春季学術講演会講演予稿集(CD-ROM)　62nd　ROMBUNNO.11A-B1-11　2015/02/26
溶融Ni‐Al合金の密度と過剰体積

佐藤明香輪, 東英夫, 安達正芳, 大塚誠, 福山博之

東北大学多元物質科学研究所研究発表会講演予稿集　15th　33　2015
Ni-Mn-In type magnetic shape memory alloy free-standing film for magnetically actuated devices

Hiroyuki Miki, Koki Tsuchiya, Eijiro Abe, Makoto Ohtsuka, Marcel Gueltig, Hinnerk Ossmer, Manfred Kohl, Toshiyuki Takagi

26th International Conference on Adaptive Structures and Technologies, ICAST 2015　2015/01/01
Thermomagnetic Actuation by Low Hysteresis Metamagnetic Ni-Co-Mn-In Films Peer-reviewed

M. Gueltig, H. Ossmer, M. Ohtsuka, H. Miki, K. Tsuchiya, T. Takagi, M. Kohl

Materials Today: Proceedings　2　(3)　S883-S886　2015
Publisher: Elsevier Ltd
DOI： 10.1016/j.matpr.2015.07.423 　

ISSN： 2214-7853

eISSN： 2214-7853
Small Scale Energy Harvesting by Magnetic Shape Memory Alloys Peer-reviewed

Manfred Kohl, Ruizhi Yin, Hinnerk Ossmer, Makoto Ohtsuka, Hiroyuki Miki, Toshiyuki Takagi, Marcel Gueltig

The 8th Energy, Materials, and Nanotechnology (EMN) Meeting Abstracts　150-151　2014/11

DOI： 10.1002/aenm.201400751 　
Structural and Transformational Properties of Ni46.4Mn38.8In12.8Co2 Thin Films

Anna Kosogor, Maria Lyange, Michail Gorshenkov, Vladimir Khovaylo, Makoto Ohtsuka, Hiroyuki Miki, Toshiyuki Takagi

IFS Collaborative Research Forum (AFI-2014) Proceedings　2014/10/08
Development of Energy Harvesting Devices based on Magnetic Shape Memory Alloy Thin Films Peer-reviewed

Marcel Gueltig, Makoto Ohtsuka, Hiroyuki Miki, Toshiyuki Takagi, Manfred Kohl

Eleventh International Conference on Flow Dynamics (ICFD 2014)　280-281　2014/10
One-way Shape Memory Effect on Ferromagnetic Ni-Mn-In Based Alloy Solidified by Compression Shearing Method at Room Temperature Peer-reviewed

Eijiro Abe, Makoto Ohtsuka, Hiroyuki Miki, Toshiyuki Takagi

Eleventh International Conference on Flow Dynamics (ICFD 2014)　538-539　2014/10
圧縮せん断法により作製されたNi‐Mn‐In系合金薄板の磁気特性と形状記憶効果

大塚誠, 阿部英次郎, 土屋光樹, 三木寛之, 高木敏行

日本金属学会講演概要(CD-ROM)　155th　ROMBUNNO.541　2014/09/10

ISSN： 2433-3093
窒化サファイア基板上Alスパッタ膜の高温窒化挙動その場観察

藤原圭吾, 安達正芳, 大塚誠, 福山博之

日本金属学会講演概要(CD-ROM)　155th　ROMBUNNO.214　2014/09/10

ISSN： 2433-3093
磁気デバイスのためのNi‐Mn‐In系合金形状記憶合金自立膜の開発

三木寛之, 土屋光樹, 大塚誠, 高木敏行

日本機械学会年次大会講演論文集(CD-ROM)　2014　ROMBUNNO.J0450203　2014/09/06
反応性パルスDCスパッタ法により作製したAlN膜の表面構造および結晶性に及ぼすスパッタ圧力の影響

竹内洋仁, 大塚誠, 福山博之

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　75th　ROMBUNNO.17P-C5-15　2014/09/01
Ga‐Alフラックスを用いた液相成長法による低酸素分圧下でのAl極性AlN膜の作製

関谷竜太, 安達正芳, 大塚誠, 杉山正史, 飯田潤二, 福山博之

応用物理学会秋季学術講演会講演予稿集(CD-ROM)　75th　ROMBUNNO.18P-C5-17　2014/09/01
溶融SUS316,鉄およびニッケルの非接触密度測定

渡邉学, 東英生, 佐々木美奈子, 安達正芳, 大塚誠, 福山博之, 西剛史, 山野秀将

材料とプロセス(CD-ROM)　27　(2)　ROMBUNNO.41　2014/09/01

ISSN： 1882-8922
強ひずみ加工によるNI‐MN‐IN系合金形状記憶合金板材の開発

三木寛之, 阿部英次郎, 土屋光樹, 大塚誠, 高木敏行

日本機械学会M&M材料力学カンファレンス(CD-ROM)　2014　ROMBUNNO.OS0906　2014/07/17
磁気駆動素子のためのNi‐Mn‐In系合金形状記憶合金自立膜の開発

土屋光樹, 大塚誠, 三木寛之, 高木敏行

日本機械学会東北支部総会・講演会講演論文集(CD-ROM)　49th　ROMBUNNO.163　2014/03/14
Co添加Ni‐Mn‐In磁性形状記憶合金自立膜の磁気特性と形状記憶効果

大塚誠, 土屋光樹, 三木寛之, 高木敏行

日本金属学会講演概要(CD-ROM)　154th　ROMBUNNO.305　2014/03/07

ISSN： 2433-3093
Al極性AlN膜基板上への低酸素分圧下におけるAlN膜液相成長

関谷竜太, 安達正芳, 大塚誠, 福山博之

日本金属学会講演概要(CD-ROM)　154th　ROMBUNNO.35　2014/03/07

ISSN： 2433-3093
窒化サファイア基板上へのAlN膜液相成長のその場観察

藤原圭吾, 安達正芳, 大塚誠, 福山博之

日本金属学会講演概要(CD-ROM)　154th　ROMBUNNO.P041　2014/03/07

ISSN： 2433-3093
アルミナの炭素熱還元挙動

福山博之, 加藤三香子, 大塚誠

耐火物　66　(3)　130　2014/03/01

ISSN： 0039-8993
OS0906 Development of Ni-Mn-In type Ferromagnetic Shape Memory Alloy Sheet by Severe Plastic Deformation Process

MIKI Hiroyuki, ABE Eijiro, TSUTIYA Koki, OHTSUKA Makoto, TAKAGI Toshiyuki

The Proceedings of the Materials and Mechanics Conference　2014　(0)　_OS0906-1_-_OS0906-2_　2014
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemm.2014._OS0906-1_ 　

More details Close

Grained Co-added Ni-Mn-In alloy was solidified using Compression Shearing Method at Room Temperature method. As for the solidified material, crystal structure at room temperature and magnetic property were investigated. In the solidified material using a Ni_<45>Mn_<40>In_<15> target, both structural-phase and martensitic transition which are induced in connection with a temperature change were observed. It became clear that the solidified material has the similar characteristic as a Ni-Mn-In bulk alloy and a sputtered film.
J0450203 Development of Ni-Mn-In type Magnetic Shape Memory Alloy Free-standing Film for Magnetic Devices

MIKI Hiroyuki, TSUCHIYA Koki, OHTSUKA Makoto, TAKAGI Toshiyuki

The Proceedings of Mechanical Engineering Congress, Japan　2014　(0)　_J0450203--_J0450203-　2014
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecj.2014._J0450203- 　

More details Close

In this study, shape memory behavior on the Ni_<50.4>Co_<3.7>Mn_<32.8>In_<13.1> films is investigated for the practical application as a magnetically driven actuator device. The Ni_<50.4>Co_<3.7>Mn_<32 8>In_<13,1> films were fabricated by the sputtering and the films of 5 μm thickness were obtained by heat-treatment in two-step. The martensitic transformation (MT) temperatures of the film determined using the electric resistance measurement and the thermal hysteresis was smaller than 10 K. The magnetization experiments reveal the abrupt magnetization change ΔM of 26emu/g at 0.05T and the MT finishing temperature (M_f) change ΔM_f of -8.5 K at 5 T. The film showed the shape memory behavior of one-way SME by heating and applying magnetic field. For the Ni_<50.4>Co_<3.7>Mn_<32.8>In_<13.1>film, with increasing temperature, the decrease of elastic modulus and the increase of elongation were confirmed in martensitic phase from the result of tensile test.
163 Development of Ni-Mn-In type magnetic shape memory alloy free-standing film for magnetic driven devices

TSUCHIYA Koki, OHTSUKA Makoto, MIKI Hiroyuki, TAKAGI Toshiyuki

The Proceedings of Conference of Tohoku Branch　2014　(0)　123-124　2014
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeth.2014.49.123 　
Magnetic, magnetooptical and magnetotransport properties of Ti-substituted Co2FeGa thin films Peer-reviewed

Vladimir Khovaylo, Valeria Rodionova, Maria Lyange, Ksenia Chichay, Elena Gan'shina, Andrey Novikov, Georgy Zykov, Alexei Bozhko, Makoto Ohtsuka, Rie Y. Umetsu, Akinari Okubo, Ryosuke Kainuma

NANOSTRUCTURED THIN FILMS VII　9172　91720M-1-91720M-4　2014

DOI： 10.1117/12.2061650 　

ISSN： 0277-786X

eISSN： 1996-756X
静磁場印加電磁浮遊法を利用した溶解Ni‐Fe合金の垂直分光放射率測定

東英生, 高野隼一, 大塚誠, 福山博之

Thermophysical Properties　34th　187-189　2013/11/20

ISSN： 0911-1743
溶融Coの垂直分光放射率,定圧モル熱容量および熱伝導率測定

高野隼一, 東英生, 打越雅仁, 一色実, 大塚誠, 福山博之

Thermophysical Properties　34th　184-186　2013/11/20

ISSN： 0911-1743
Smart Microdevices Based on Ferromagnetic Shape Memory Alloys Peer-reviewed

Manfred Kohl, Marcel Gültig, Makoto Ohtsuka, Hiroyuki Miki, Ruizhi Yin

Tenth International Conference on Flow Dynamics (ICFD2013)　484-485　2013/11
Mechanical Properties and Martensitic Transformation of Ni-Mn-In Based Magnetic Shape Memory Alloy Films Peer-reviewed

Koki Tsuchiya, Makoto Ohtsuka, Hiroyuki Miki, Toshiyuki Takagi

Tenth International Conference on Flow Dynamics (ICFD2013)　742-743　2013/11
Ni‐Mn‐In系磁性形状記憶合金膜の開発および機械的特性評価

土屋光樹, 大塚誠, 三木寛之, 高木敏行

日本機械学会M&M材料力学カンファレンス(CD-ROM)　2013　ROMBUNNO.OS1604　2013/10/10
大気中熱処理によるa面サファイア基板の表面性状の変化と表面窒化に及ぼす影響

関谷竜太, 大塚誠, 安達正芳, 福山博之

日本金属学会講演概要(CD-ROM)　153rd　ROMBUNNO.95　2013/09/03

ISSN： 2433-3093
Al添加省In組成ITOスパッタ薄膜の低抵抗化と高赤外透過性

大塚誠, 中村崇

日本金属学会講演概要(CD-ROM)　153rd　ROMBUNNO.101　2013/09/03

ISSN： 2433-3093
反応性スパッタ法により作製されたAlN膜の熱処理による高品質化

熊田智行, 大塚誠, 福山博之

日本金属学会講演概要(CD-ROM)　153rd　ROMBUNNO.96　2013/09/03

ISSN： 2433-3093
Fe添加省In組成ITOスパッタ薄膜の高赤外線透過性

大塚誠, 中村崇

応用物理学会春季学術講演会講演予稿集(CD-ROM)　60th　ROMBUNNO.29A-G19-9　2013/03/11
Al₂O₃熱窒化法によるAlN結晶成長に及ぼすZrO₂添加の効果

尤玉, 加藤三香子, 大塚誠, 福山博之

応用物理学会春季学術講演会講演予稿集(CD-ROM)　60th　ROMBUNNO.28A-G21-11　2013/03/11
OS1604 Development of Ni-Mn-In based magnetic shape memory alloy films and its mechanical properties

TSUCHIYA Koki, OHTSUKA Makoto, MIKI Hiroyuki, TAKAGI Toshiyuki

The Proceedings of the Materials and Mechanics Conference　2013　(0)　_OS1604-1_-_OS1604-3_　2013
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemm.2013._OS1604-1_ 　

More details Close

Ni-Mn-In films containing cobalt were deposited on a poly-vinyl alcohol (PVA) substrate or an alumina substrate using a dual magnetron sputtering apparatus using Ni45Mn4oInisand Co targets. The RF power for Ni-Mn-In target was kept at 200 W, and the DC power for the cobalt target was changed from 0 to 15 W. The thickness of the deposited films was kept at about 1 μm. After deposition, the films were annealed at 1123 K for 3.6 ks. The cobalt concentration of the films depended on the DC sputtered power and the martensitic transformation temperature decreased with cobalt concentration of films. After heat treatment, the films showed the good crystalline order. The mechanical properties of the films were measured by a nanoindentation method. Hardness and elastic modulus of the heat-treated films were lower than those of as-deposited films. These values of the films were affected by the Co concentration and microstructure.
Al₂O₃熱窒化法によるバルクAlN結晶成長に及ぼすZrO₂添加の効果

尤玉, 加藤三香子, 大塚誠, 福山博之

資源・素材学会春季大会講演集　2013　295-296　2013

ISSN： 1343-9898
Autonomous generator based on Ni-Mn-Ga microactuator as a frequency selective element Peer-reviewed

M. M. Krupa, Y. B. Skirta, J. M. Barandiaran, M. Ohtsuka, V. A. Chernenko

EPJ Web of Conferences　40　09001-09001　2013

DOI： 10.1051/epjconf/20134009001 　

ISSN： 2101-6275 2100-014X

eISSN： 2100-014X
Thermal energy harvesting based on ferromagnetic shape memory alloy microactuation Peer-reviewed

M. Gueltig, B. Haefner, M. Ohtsuka, M. Kohl

2013 Transducers and Eurosensors XXVII: The 17th International Conference on Solid-State Sensors, Actuators and Microsystems, TRANSDUCERS and EUROSENSORS 2013　2803-2806　2013

DOI： 10.1109/Transducers.2013.6627388 　
省In組成ITOスパッタ薄膜の光・電気特性に及ぼすFe添加量の影響

大塚誠, SERGIIENKO Ruslan, 中村崇

日本金属学会講演概要(CD-ROM)　151st　ROMBUNNO.404　2012/09/03

ISSN： 2433-3093
熱処理によるa面サファイア基板の表面性状の変化

関谷竜太, 大塚誠, 安達正芳, 福山博之

日本金属学会講演概要(CD-ROM)　151st　ROMBUNNO.P150　2012/09/03

ISSN： 2433-3093
非接触レーザー周期加熱カロリメトリー法による溶融Coの熱物性測定

高野隼一, 東英夫, 打越雅仁, 一色実, 大塚誠, 福山博之

材料とプロセス(CD-ROM)　25　(2)　ROMBUNNO.58　2012/09/01

ISSN： 1882-8922
加熱基板上に作製された鉄添加省インジウム組成ITOスパッタ薄膜の光・電気特性

大塚誠, SERGIIENKO Ruslan, 中村崇

応用物理学会学術講演会講演予稿集(CD-ROM)　73rd　ROMBUNNO.14A-H7-6　2012/08/27
アルミナを原料に用いたバルクAlN結晶成長の温度依存性

加藤三香子, 大塚誠, 福山博之

応用物理学会学術講演会講演予稿集(CD-ROM)　73rd　ROMBUNNO.12A-PB4-5　2012/08/27
極薄Al中間層を用いたAl極性AlN膜成長

熊田智行, 大塚誠, 福山博之

応用物理学会学術講演会講演予稿集(CD-ROM)　73rd　ROMBUNNO.13A-H10-5　2012/08/27
Ni‐Mn‐Ga強磁性形状記憶合金における自発磁化の組成依存性および磁気相図の実験的決定

許きょう, 長迫実, 伊東航, 梅津理恵, 大塚誠, 大沼郁雄, 貝沼亮介

日本金属学会講演概要(CD-ROM)　150th　ROMBUNNO.206　2012/03/15

ISSN： 1342-5730
Ni‐Mn‐Ga強磁性形状記憶合金における自発磁化の組成依存性および磁気相図の実験的決定

許きょう, 長迫実, 伊東航, 梅津理恵, 大塚誠, 大沼郁雄, 貝沼亮介

日本金属学会講演概要(CD-ROM)　150th　ROMBUNNO.206　2012/03/15

ISSN： 2433-3093
次世代紫外発光素子に向けた単結晶AlN膜の作製

福山博之, 熊田智行, 大塚誠

文部科学省特別経費「大学の特性を生かした多様な学術研究機能の充実」附置研究所間アライアンスによるナノとマクロをつなぐ物質・デバイス・システム創製戦略プロジェクト（ナノマクロ物質・デバイス・システム創製アライアンス）平成23年度（2011年度）成果報告書　269-270　2012/03

More details Close

506
反応性スパッタ法により作製されたAlN膜の結晶性に及ぼす基板温度の影響

熊田智行, 大塚誠, 福山博之

応用物理学関係連合講演会講演予稿集(CD-ROM)　59th　ROMBUNNO.16A-DP1-4　2012/02/29
静磁場印加電磁浮遊法による溶融Coの垂直分光放射率および定圧モル熱容量測定

高野隼一, 東英生, 打越雅仁, 一色実, 大塚誠, 福山博之

日本金属学会東北支部研究発表大会予稿集　11th　10　2012
a面サファイア基板の窒化における表面性状の影響

関谷竜太, 大塚誠, 福山博之

日本金属学会東北支部研究発表大会予稿集　11th　17　2012
Entropy Flow in Magnetically Ordered Heusler Alloys under Influence of Temperature or Magnetic Field

Vladimir Khovaylo, Ekaterina Avilova, Hiroyuki Miki, Toshiyuki Takagi, Makoto Ohtsuka, Vasiliy Buchelnikov, Konstantin Skokov, Oliver Gutfleisch

IFS Collaborative Research Forum (AFI/TFI-2011)　152-153　2011/11/10
アルミナの炭素熱還元挙動の温度依存性

加藤三香子, 小畠秀和, 大塚誠, 福山博之

日本金属学会講演概要(CD-ROM)　149th　ROMBUNNO.POSUTASESSHON,187　2011/10/20

ISSN： 2433-3093
Fe添加省In組成ITOスパッタ薄膜の低抵抗化

大塚誠, SERGIIENKO Ruslan, PETROVSKA Svitlana, 中村崇

日本金属学会講演概要(CD-ROM)　149th　ROMBUNNO.S8.5　2011/10/20

ISSN： 2433-3093
反応性スパッタ法により基板温度823Kで作製されたAlN膜の結晶性と窒素流量比の関係

熊田智行, 大塚誠, 福山博之

日本金属学会講演概要(CD-ROM)　149th　ROMBUNNO.POSUTASESSHON,189　2011/10/20

ISSN： 2433-3093
Ga‐Al液相成長AlNの転位解析および極性判定

安達正芳, 田中明和, 森川大輔, 津田健治, 小畠秀和, 大塚誠, 福山博之

応用物理学会学術講演会講演予稿集(CD-ROM)　72nd　ROMBUNNO.30P-ZF-9　2011/08/16
反応性スパッタ法により823Kで作製されたAlN膜の結晶品質に及ぼす窒素流量比の影響

熊田智行, 大塚誠, 福山博之

応用物理学会学術講演会講演予稿集(CD-ROM)　72nd　ROMBUNNO.31A-ZE-4　2011/08/16
加熱基板上に作製された省In組成ITOスパッタ薄膜の光・電気特性

大塚誠, PETROVSKA Svitlana, VOISIN Leandro, 中村崇

日本金属学会講演概要　148th　185　2011/04/20

ISSN： 1342-5730
High-temperature processes and measurements of materials

福山博之, 大塚誠, 小畠秀和

Materials Integration　24　(4/5)　277-283　2011/03/25

ISSN： 1344-7858
Ga‐Alフラックスから成長したAlN膜の転位および極性解析

安達正芳, 前田一夫, 田中明和, 森川大輔, 津田健治, 小畠秀和, 大塚誠, 福山博之

応用物理学関係連合講演会講演予稿集(CD-ROM)　58th　ROMBUNNO.25P-BY-9　2011/03/09
反応性スパッタ法により823Kで作製されたAlN膜の結晶品質に及ぼすスパッタ電力の影響

熊田智行, 大塚誠, 福山博之

応用物理学関係連合講演会講演予稿集(CD-ROM)　58th　ROMBUNNO.25P-BY-7　2011/03/09
次世代紫外発光素子に向けた単結晶AlN膜の作製

福山博之, 大塚誠, 小畠秀和

文部科学省特別経費「大学の特性を生かした多様な学術研究機能の充実」附置研究所間アライアンスによるナノとマクロをつなぐ物質・デバイス・システム創製戦略プロジェクト（ナノマクロ物質・デバイス・システム創製アライアンス）平成22年度（2010年度）成果報告書　243-244　2011/03

More details Close

505
反応性スパッタ法により基板温度823Kで作製されるAlN膜の結晶性向上

熊田智行, 大塚誠, 福山博之

東北大学多元物質科学研究所研究発表会講演予稿集　11th　60　2011
Enhancement of Carbothermic Reduction of Al2O3 via Mechanical Milling

Asep Ridwan Setiawan, Makoto Ohtsuka, Hiroyuki Fukuyama

4TH NANOSCIENCE AND NANOTECHNOLOGY SYMPOSIUM (NNS2011): AN INTERNATIONAL SYMPOSIUM　1415　132-135　2011

DOI： 10.1063/1.3667239 　

ISSN： 0094-243X

eISSN： 1551-7616
反応性スパッタ法により773Kで作製されたAlN膜の結晶品質に及ぼす窒素流量比の影響

熊田智行, 大塚誠, 福山博之

日本金属学会講演概要　147th　373　2010/09/25

ISSN： 1342-5730
Sb添加ITOスパッタ薄膜の光・電気特性に及ぼす酸素流量比と熱処理温度の影響

大塚誠, PETROVSKA Svitlana, VOISIN Leandro, 中村崇

日本金属学会講演概要　147th　368　2010/09/25

ISSN： 1342-5730
アルミナの炭素熱還元析出法による高品質AlNバルク単結晶の作製

加藤三香子, 小畠秀和, 大塚誠, 福山博之, 服部剛, 東正信, 高田和哉

応用物理学会学術講演会講演予稿集(CD-ROM)　71st　ROMBUNNO.14P-C-15　2010/08/30
省インジウム組成ITOスパッタ薄膜の低抵抗化

大塚誠, PETROVSKA Svitlana, VOISIN Leandro, 中村崇

応用物理学会学術講演会講演予稿集(CD-ROM)　71st　ROMBUNNO.16P-ZJ-15　2010/08/30
反応性スパッタ法で作製されたAlN膜の結晶品質に及ぼす窒素流量比および基板温度の影響

熊田智行, 大塚誠, 福山博之

応用物理学会学術講演会講演予稿集(CD-ROM)　71st　ROMBUNNO.16A-C-4　2010/08/30
Ni‐Mn基合金の磁場誘起相変態とメタ磁性形状記憶効果

大塚誠, 小山佳一

東北大学金属材料研究所強磁場超伝導材料研究センター年次報告　2009　135-137　2010/06
反応性スパッタ法により作製された単結晶AlN膜の結晶性に及ぼす窒素分圧の影響

熊田智行, 大塚誠, VASHAEI Zahra, 福山博之

日本金属学会講演概要　146th　307　2010/03/28

ISSN： 1342-5730
省インジウム組成ITOスパッタ薄膜の開発

大塚誠, ANDRES Voisin, Aravena Leandro, 中村崇

日本金属学会講演概要　146th　305　2010/03/28

ISSN： 1342-5730
省インジウムITOスパッタ技術の現状

大塚誠

日本化学会講演予稿集　90th　(1)　67　2010/03/12

ISSN： 0285-7626
Electron beam lithography of free-standing Ni-Mn-Ga films

Mario Schmitt, M. Ohtsuka, M. Kohl

Physics Procedia　10　174-181　2010/01/01

DOI： 10.1016/j.phpro.2010.11.095 　

ISSN： 1875-3884

eISSN： 1875-3892
Martensitic transformation in Ni-Mn-Ga thin films deposited on alumina

M. Hagier, V. A. Chernenko, M. Ohtsuka, S. Besesseghini, P. Müller

Proceedings of the International Conference on Martensitic Transformations, ICOMAT-08　453-457　2009/12/01
Structural and magnetic phenomena in NIMNGA/substrate thin films composites

V. A. Chernenko, S. Besseghini, V. Recarte, R. Lopez Anton, A. Gambardella, J. M. Barandiaran, M. Ohtsuka

Proceedings of the International Conference on Martensitic Transformations, ICOMAT-08　459-464　2009/12/01
サファイア窒化法による単結晶AlN膜作製における最適条件の探索

熊田智行, 小畠秀和, 大塚誠, 福山博之

日本金属学会講演概要　145th　449　2009/09/15

ISSN： 1342-5730
Ni‐Mn‐In合金スパッタ膜の構造と磁気特性に及ぼすCo添加の影響

大塚誠, 梅津理恵, 貝沼亮介, 三井好古, 小山佳一, 渡辺和雄, 石田清仁

日本金属学会講演概要　145th　410　2009/09/15

ISSN： 1342-5730
強磁場・高温X線回折測定によるNiCoMnIn薄膜の相変態の観測

三井好古, 小山佳一, 渡辺和雄, 大塚誠, 梅津理恵, 貝沼亮介

日本物理学会講演概要集　64　(2)　377　2009/08/18

ISSN： 1342-8349
Ni‐Mn‐Inメタ磁性形状記憶合金スパッタ膜の磁気特性

大塚誠, 梅津理恵, 貝沼亮介, 石田清仁

日本金属学会講演概要　144th　322　2009/03/28

ISSN： 1342-5730
27pQJ-11 Observation of phase transition of NiCoMnIn thin film by high-field X-ray diffraction measurements in high temperature

Mitsui Y., Koyama K., Watanabe K., Ohtsuka M., Umetsu R. Y., Kainuma R.

Meeting Abstracts of the Physical Society of Japan　64　(0)　377-377　2009
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.64.2.3.0_377_2 　

ISSN： 1342-8349
Magnetic-field induced phase transformation and metamagnetic shape memory effect of Ni-Mn base alloys

大塚誠, 小山佳一

東北大学金属材料研究所強磁場超伝導材料研究センター年次報告　2009　135-137　2009
Publisher: 東北大学金属材料研究所附属強磁場超伝導材料研究センター
サファイア窒化法により作製したAIN薄膜の結晶性に及ぼす温度および窒素分圧の影響

熊田智行, 大塚誠, 福山博之

東北大学多元物質科学研究所研究発表会講演予稿集　9th　97　2009
Structural and magnetic properties of Ni-Mn-Ga films sputter-deposited on cube-textured polycrystalline substrate Peer-reviewed

V. A. Chernenko, P. Bassani, R. Lopez Anton, S. Besseghini, J. M. Barandiaran, A. Tuissi, I. Orue, P. Lazpita, M. Ohtsuka

ESOMAT 2009 - 8TH EUROPEAN SYMPOSIUM ON MARTENSITIC TRANSFORMATIONS　04003-1-04003-5　2009

DOI： 10.1051/esomat/200904003 　
Ni‐Co‐Mn‐Snメタ磁性形状記憶合金の薄膜化と磁気特性の評価

大塚誠, 梅津理恵, 貝沼亮介, 石田清仁

日本金属学会講演概要　143rd　403　2008/09/23

ISSN： 1342-5730
強磁性形状記憶合金Ni‐Mn‐Ga膜を用いた2次元光学スキャナの開発

大塚誠, BRUGGER Daniel, KOHL Manfred

日本金属学会講演概要　143rd　417　2008/09/23

ISSN： 1342-5730
Ni₅₄Mn₂₃Ga₂₃スパッタ膜の機械的特性に及ぼす温度および磁場の影響

大塚誠, 山内真一, 松本實, 板垣乙未生

日本金属学会講演概要　142nd　142　2008/03/26

ISSN： 1342-5730
コンビナトリアルスパッタ法によるITO薄膜の作製

大塚誠, ANDRES Voisin, Aravena Leandro, 中村崇

資源・素材　2008　(C/D/E)　105-106　2008

ISSN： 0919-7915
Magnetostructural phase transitions of ferromagnetic shape memory alloy sputtered films

大塚誠, 小山佳一

東北大学金属材料研究所強磁場超伝導材料研究センター年次報告　2008　150-152　2008
Publisher: 東北大学金属材料研究所附属強磁場超伝導材料研究センター
Magnetic anisotropy, sress, and martensitic transformation in Ni-Mn-Ga thin films on Si(100) wafer

Michael Hagler, Volodymyr A. Chernenko, Makoto Ohtsuka, Stefano Besseghini, Peter Muelliner

Materials Research Society Symposium Proceedings　998　109-114　2007/12/01

DOI： 10.1557/proc-998-j06-09 　

ISSN： 0272-9172
Magnetostructural Phase Transformations of Ferromagnetic Shape Memory Alloy Sputtered Films

Makoto Ohtsuka, Jyunpei Sekino, Kimio Itagaki, Toshiyuki Takagi, Keiichi Koyama

Selected Topics in 2006 Annual Report at Sendai　5　2007/09
3d遷移元素添加Ni₂MnGa強磁性形状記憶合金膜の磁気抵抗

小池邦博, 山根アダム, 大塚誠, 松本實, 高木敏行, 安達義也, 加藤宏朗

日本金属学会講演概要　140th　506　2007/03/27

ISSN： 1342-5730
鉄添加Ni₂MnGaスパッタ膜の形状記憶効果に及ぼす拘束時効処理の影響

関野淳平, 大塚誠, 松本實, 高木敏行, 小山佳一, 板垣乙未生

日本金属学会講演概要　140th　140　2007/03/27

ISSN： 1342-5730
Magnetostructural phase transitions of ferromagnetic shape memory alloy sputtered films

大塚誠, 小山佳一

東北大学金属材料研究所強磁場超伝導材料研究センター年次報告　2007　113-116　2007
Publisher: 東北大学金属材料研究所附属強磁場超伝導材料研究センター
Ni₂MnGa合金膜の磁気抵抗に与える3d遷移元素の添加効果

山根アダム, 本田泰之, 小池邦博, 大塚誠, 松本實, 高木敏行, 安達義也, 森田博昭, 加藤宏朗

応用物理学会東北支部学術講演会講演予稿集　61st　84-85　2006/12/07
バイアススパッタ法によるLaNi₅膜の組織と構造に及ぼすスパッタ電力の影響

中門研太, 大塚誠, 菖蒲祐輔, 板垣乙未生

日本金属学会講演概要　139th　168　2006/09/16

ISSN： 1342-5730
鉄を添加した強磁性Ni₂MnGaスパッタ膜の形状記憶効果に及ぼす組成の影響

関野淳平, 大塚誠, 勝山博之, 松本實, 高木敏行, 板垣乙未生

日本金属学会講演概要　139th　292　2006/09/16

ISSN： 1342-5730
MAGNETIC PROPERTY AND SHAPE MEMORY EFFECT OF Ni₂MnGa SPUTTERED FILMS CONTAINING IRON

M. Ohtsuka, K. Koike, M. Matsumoto, T. Takagi, K. Itagaki

Proceedings of The Third International Symposium on Intelligent Artifacts and Bio-systems　2006/09
Phase transitions in Ni2+xMn1-xGa with a high Ni excess (vol 72, pg 224408, 2005)

VV Khovaylo, VD Buchelnikov, R Kainuma, VV Koledov, M Ohtsuka, VG Shavrov, T Takagi, SV Taskaev, AN Vasiliev

PHYSICAL REVIEW B　73　(14)　2006/04

DOI： 10.1103/PhysRevB.73.149901 　

ISSN： 1098-0121

eISSN： 1550-235X
Magnetostructural phase transitions of ferromagnetic shape memory alloy sputtered films

大塚誠, 関野淳平, 小山佳一

東北大学金属材料研究所強磁場超伝導材料研究センター年次報告　2006　93-96　2006
Publisher: 東北大学金属材料研究所附属強磁場超伝導材料研究センター
Ni₂MnGaスパッタ膜のマルテンサイト変態と磁気的性質に及ぼすFeおよびCo添加の影響

勝山博之, 大塚誠, 片野義春, 小池邦博, 松本実, 板垣乙未生

日本金属学会講演概要　137th　331　2005/09/28

ISSN： 1342-5730
Ni₂MnGaスパッタ膜の形状記憶効果に及ぼすFeおよびCo添加の影響

大塚誠, 勝山博之, 片野義春, 松本実, 高木敏行, 板垣乙未生

日本金属学会講演概要　137th　331　2005/09/28

ISSN： 1342-5730
バイアススパッタ法により作製されたLaNi₅膜の組織と構造

菖蒲祐輔, 大塚誠, 佐藤尚平, 板垣乙未生

日本金属学会講演概要　137th　208　2005/09/28

ISSN： 1342-5730
Development of Ferromagnetic Shape Memory Alloy Ni_2MnGa Sputtered Films and Its Application for Actuator

OHTSUKA Makoto

Materia Japan　44　(4)　308-314　2005/04/20
Publisher: The Japan Institute of Metals and Materials
DOI： 10.2320/materia.44.308 　

ISSN： 1340-2625
強磁性形状記憶合金Ni₂MnGaスパッタ膜の形状記憶特性に及ぼす組成の影響

大塚誠, 紺野勇哉, 松本実, 板垣乙未生

日本金属学会講演概要　136th　77　2005/03/29

ISSN： 1342-5730
Influence of three-dimensional transition elements on magnetic and structural phase transitions of Ni-Mn-Ga alloys (vol 95, pg 1740, 2004)

AA Cherechukin, T Takagi, H Miki, M Matsumoto, M Ohtsuka

JOURNAL OF APPLIED PHYSICS　97　(5)　2005/03

DOI： 10.1063/1.1850176 　

ISSN： 0021-8979
Magnetic properties of submicron Ni-Mn-Ga martensitic thin films International-journal International-coauthorship

M. Kohl, V. A. Chernenko, M. Ohtsuka, H. Reuter, T. Takagi

Materials Research Society Symposium Proceedings　855　36-41　2004/12/01

ISSN： 0272-9172
多結晶Ni₂MnGa強磁性形状記憶合金の機械的特性に及ぼす第2相の影響

大塚誠, 小笠原宏行, 松本実, 板垣乙未生

日本金属学会講演概要　135th　333　2004/09/28

ISSN： 1342-5730
強磁性形状記憶合金スパッタ膜の機械的特性

大塚誠, 紺野勇哉, 松本実, 木村久道, 笹森賢一郎

新素材設計開発施設共同利用研究報告書　2003　11-12　2004/06
Influence of three-dimensional transition elements on magnetic and structural phase transitions of Ni-Mn-Ga alloys

AA Cherechukin, T Takagi, H Miki, M Matsumoto, M Ohtsuka

JOURNAL OF APPLIED PHYSICS　95　(4)　1740-1742　2004/02

DOI： 10.1063/1.1641184 　

ISSN： 0021-8979
Optical scanner based on a NiMnGa thin film microactuator International-journal International-coauthorship

M Kohl, S Hoffmann, Y Liu, M Ohtsuka, T Takagi

JOURNAL DE PHYSIQUE IV　112　1185-1188　2003/10

DOI： 10.1051/jp4:20031094 　

ISSN： 1155-4339
Mechanical and shape memory properties of ferromagnetic Ni2MnGa sputter-deposited films International-journal

M Ohtsuka, M Matsumoto, K Itagaki

JOURNAL DE PHYSIQUE IV　112　899-902　2003/10

DOI： 10.1051/jp4:20031026 　

ISSN： 1155-4339
A novel actuation mechanism based on ferromagnetic SMA thin films Peer-reviewed

M Kohl, D Brugger, M Ohtsuka, T Takagi

BOSTON TRANSDUCERS'03: DIGEST OF TECHNICAL PAPERS, VOLS 1 AND 2　2　1011-1014　2003

DOI： 10.1109/SENSOR.2003.1216939 　
Ferromagnetic shape-memory alloy Ni₂MnGa

Minoru Matsumoto, Makoto Ohtsuka, Hiroyuki Miki, Vladimir V. Khovailo, Toshiyuki Takagi

Materials Science Forum　394-395　545-548　2002/12

ISSN： 0255-5476

eISSN： 1662-9752
Electron Holography Studies of Magnetic Domain Structure in Sputtered Ni₂MnGa Alloy Films Peer-reviewed

Yasukazu Murakami, Daisuke Shindo, Motohiko Suzuki, Makoto Ohtsuka, Kimio Itagaki

15th International Congress on Electron Microscopy　1　735-736　2002/09/03
Two-way shape memory effect and mechanical properties of pulse discharge sintered Ni2.18Mn0.82Ga

T Takagi, Khovailo, V, T Nagatomo, M Matsumoto, M Ohtsuka, T Abe, H Miki

INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS　16　(3-4)　173-179　2002

DOI： 10.3233/jae-2002-235 　

ISSN： 1383-5416
Ferromagnetic shape memory alloy Ni2MnGa films International-journal

M Matsumoto, M Ohtsuka, K Itagaki, T Takagi, T Fujino

JOURNAL DE PHYSIQUE IV　11　(PR8)　275-279　2001/11

DOI： 10.1051/jp4:2001847 　

ISSN： 1155-4339
Properties of Ferromagnetic Shape Memory Alloy Ni_2MnGa

MATSUMOTO Minoru, OHTSUKA Makoto, MIKI Hiroyuki, TAKAGI Toshiyuki, ITAGAKI Kimio

シンポジウム電磁力関連のダイナミックス講演論文集　13　391-392　2001/06/20
Characterization of the Oxide Films Formed on the Surface of Nb and Y Deposited TiAl Substrates by Oxidizing under the Low Oxygen Pressure Peer-reviewed

Hirobumi Inoue, Shigeru Suzuki, Yoshio Waseda, Makoto Ohtsuka, Kimio Itagaki

Bulletin of the Institute for Advanced Materials Processing Building, IMRAM, Tohoku University　57　(1, 2)　39-48　2001/04
Mechanical and Shape Memory Properties of Ferromagnetic Ni_2+xMn_1-xGa Alloys Peer-reviewed

Toshiyuki Takagi, Vladimir V. Khovailo, Takeshi Nagatomo, Minoru Matsumoto, Makoto Ohtsuka, Toshihiko Abe, Hiroyuki Miki

The Short Version of Papers for Presentation, Third Asian Symposium on Applied Electromagnetics, ASAEM2001　128-129　2001/04
〓

D. G. Mendoza, C. Wedel, H. M. Henao

東北大学素材工学研究所彙報 = Bulletin of the Institute for Advanced Materials Processing, Tohoku University　56　(1)　124-125　2001/03/01
Publisher: 東北大学素材工学研究所
ISSN： 0919-4827
K-0404 Shape Memory Property of Ferromagnetic Shape Memory Alloy Ni_2MnGa

ISOKAWA Shinji, OHTSUKA Makoto, MATSUMOTO Minoru, TAKAGI Toshiyuki, ITAGAKI Kimio

The proceedings of the JSME annual meeting　1　(0)　87-88　2001
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.I.01.1.0_87 　

More details Close

Ferromagnetic shape memory alloy Ni_2MnGa has Heusler type crystal structure. Cubic structure of high temperature phase transforms to tetragonal one during cooling by thermo-elastic martensitic transformation. These transformation temperatures are below Curie temperature. Curie temperature decreased and transformation temperatures increased with increase of Ni composition in non-stoichiometric Ni_<2+x>Mn_<1-x>Ga (x=0〜0.19). Sputtered films were fabricated by a magnetron sputtering apparatus. The thickness of these films was 5 μm. Columnar structures which grew in parallel with the thickness of film were observed in these films. Crystal structures, transformation temperatures and magnetic properties of these films were similar to bulk specimens. Sputtered films showed two way shape memory effect.
K-2322 Mechanical Properties of Ferromagnetic Shape Memory Alloy Ni_2MnGa Sputtered Film

OHTSUKA Makoto, OHI Kiyoshi, MATSUMOTO Minoru, ITAGAKI Kimio, TAKAGI Toshiyuki

The proceedings of the JSME annual meeting　1　(0)　345-346　2001
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.V.01.1.0_345 　

More details Close

The Ni_2MnGa films were deposited on an alumina substrate with a radio-frequency magnetron sputtering apparatus using Ni_<50>Mn_<25>Ga_<25> and Ni_<52>Mn_<24>Ga_<24> targets. The sputtering power was 50 or 200 W. The thickness of the deposited films was about 5 μm. After deposition, the films were annealed at 873-1173 K. for 3.6 or 36 ks. The as-deposited films were crystalline and had columnar grains. After heat treatment, the grains widened and the grain boundary became indistinct with increasing heat treatment temperature. MnO and Ni_3(Mn, Ga) precipitations were observed in the heat-treated films. The mechanical properties of the films were measured by the nanoindentation method. Hardness and elastic modulus of as-deposited films were larger than that of arc-melted bulk samples. The hardness of the films was changed between 600 and 300 affected by the composition, crystal structure, microstructure and precipitation, etc. The elastic modulus of the films was also changed from 140 to 90 GPa with heat treatment conditions.
Martensitic transformation and shape memory effect of sputtered Ni-Mn-Ga films Peer-reviewed

M. Ohtsuka, M. Matsumoto, K. Itagaki

PRICM 4: FORTH PACIFIC RIM INTERNATIONAL CONFERENCE ON ADVANCED MATERIALS AND PROCESSING, VOLS I AND II　1661-1664　2001
Progress of ferromagnetic shape memory alloy research

MATSUMOTO Minoru, OHTSUKA Makoto, MIKI Hiroyuki, TAKAGI Toshiyuki

Journal of the Japan Society of Applied Electromagnetics　8　(4)　445-453　2000/12/10
Publisher: 日本AEM学会
ISSN： 0919-4452
<Original Paper> Measurement of Mechanical Properties for Sputtered LaNi_5 Thin Films Using Nanoindentation

Makoto OHTSUKA, Tetsurou TOKUMOTO, Kimio ITAGAKI

Bulletin of the Institute for Advanced Materials Processing, Tohoku University　56　(1/2)　17-24　2000/12
Publisher: 東北大学素材工学研究所
ISSN： 0919-4827

More details Close

LaNi_5 intermetallic compound has superior hydrogen-absorption and -desorption properties, and it is well known as a hydrogen storage material. Thin films of hydrogen storage alloy may be used as electrode of rechargeable batteries or fuel cell, a filter for hydrogen purification and various kinds of sensor. LaNi_5 thin films were prepared by a radio frequency magnetron sputtering apparatus with a sputtering power of 50-400W at substrate temperature of 323-573K. Mechanical properties of the films such as hardness and elastic modulus were investigated with respect to the sputtering conditions using nanoindentation in the present study. The difference in the structure gave an effect to the hardness of the films. For the same structure, the films deposited at higher sputtering power and higher substrate temperature showed higher hardness. The crystal orientation gave an effect to the elastic modulus of the films.lanthanum-nickelhydrogen storage alloymicrostructurehardnesselastic modulus
強磁性温度領域で効果を発揮する形状記憶合金

松本實, 大塚誠

工業材料　48　(9)　72-75　2000/09
Publisher: 日刊工業新聞社
ISSN： 0452-2834
Properties of Ferromagnetic Shape Memory Alloy Ni₂MnGa Thin Films Peer-reviewed

Minoru Matsumoto, Makoto Ohtsuka, Kimio Itagaki, Takeo Fujino

Proc. 9th MAGDA　36-39　2000/04
〓

大塚誠

東北大学素材工学研究所彙報 = Bulletin of the Institute for Advanced Materials Processing, Tohoku University　55　(1)　155-155　2000/03/10
Publisher: 東北大学素材工学研究所
ISSN： 0919-4827
〓

B. Wedel, J. M. Font, D. G. Mendoza, A. Zakeri, C. Wedel, H. M. Henao

東北大学素材工学研究所彙報 = Bulletin of the Institute for Advanced Materials Processing, Tohoku University　55　(1)　120-121　2000/03/10
Publisher: 東北大学素材工学研究所
ISSN： 0919-4827
327 Fabrication and Characterization of Ferromagnetic Shape Memory Alloy Ni_2MnGa Thin Films

MATSUMOTO Minoru, OHTSUKA Makoto, TAKAGI Toshiyuki, ITAGAKI Kimio, FUJINO Takeo

The Proceedings of the Materials and processing conference　2000　(0)　263-264　2000
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemp.2000.8.263 　

More details Close

Ferromagnetic shape memory alloy Ni_2MnGa has Heusler type crystal structure. In this alloy, the martensitic transformation occurs within the ferromagnetic temperature range. Using the melt spinning method and the sputtering method, several kinds of Ni_2MnGa thin films were fabricated in order to study the physical and mechanical properties. These thin film specimens had good crystallinity and showed the crystal structure as same as bulk specimen. Rapidly solidified Ni_2MnGa ribbons made by single roll melt spinning method were 20μm in thickness and 1mm in width. The transformation temperatures, Ms, Mf, As and Af, were 120, 90, 125 and 150K, respectively. This was a brittle specimen. Sputtered Ni_2MnGa thin films were made by using a high frequency magnetron sputtering apparatus. The thickness of the thin film was 5μm. The films deposited on the poly-vinyl alcohol substrate showed shape memory effect.
502 Mechanical Properties of Ferromagnetic Shape Memory Alloys

NAGATOMO Takeshi, MIKI Hiroyuki, TAKAGI Toshiyuki, ABE Toshihiko, OTSUKA Makoto, LUO Yun, MATSUMOTO Minoru, SATO Takeshi, YAMAUCHI Kiyoshi

The Proceedings of Conference of Tohoku Branch　2000　(0)　160-161　2000
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmeth.2000.35.160 　

More details Close

In this study, the mechanical properties of shape memory alloys, Ni_<2.1>Mn_<0.9>Ga and Ti51at%Ni were investigated. Ni_<2.1>Mn_<0.9>Ga was a ferromagnetic shape memory alloy which indicated magnetic field-induced shape memory effect, and Ti51at%Ni was known as a typical shape memory alloy. The temperature dependence of the sound velocities were measured using an ultrasonic pulse echo measurement. Experimental results show that the velocities decreased at the temperature of the transformation.
Shape Memory Effect of Sputtered Ni_2MnGa Film

OHTSUKA Makoto, CHIBA Hiroki, MATSUMOTO Minoru, ITAGAKI Kimio, TAKAGI Toshiyuki

The proceedings of the JSME annual meeting　2000　(0)　43-44　2000
Publisher: The Japan Society of Mechanical Engineers
DOI： 10.1299/jsmemecjo.2000.1.0_43 　

More details Close

The Ni-Mn-Ga films were deposited on a poly-vinyl alcohol substrate with a radio-frequency magnetron sputtering apparatus using Ni_<50>Mn_<25>Ga_<25> and Ni_<52>Ga_<24> targets. After separating from the substrates, the films were annealed at several temperatures for 3.6ks. The chemical composition of the films depended on the radio-frequency generating power, however, there was no dependence on the heat treatment temperature. Each deposited film has a columnar grain structure. After heat treatment, the width of columnar grains widened and then became indistinct with increasing heat treatment temperature. At more than 1073 K, the precipitation of MnO was observed clearly. The films showed he most crystallinity at 1073 K. The martensitic transformation temperature increased with increasing nickel content of films, while the Curie temperature decreased. The film obtained at 200 W using the Ni_<52>Mn_<24>Ga_<24> target after heat treatment at 1073 K showed one-way shape memory effect through the reverse martensitic structural transformation during heating.
Interdiffusion paths in the diffusion couple Y-Al2O3 Peer-reviewed

M. Ohtsuka, R. Cremer, E. Zimmermann, D. Neuschutz

HIGH TEMPERATURE MATERIALS CHEMISTRY, PTS I AND II, PROCEEDINGS　15　621-624　2000

ISSN： 1433-5522
Structure of Ni-Mn-Ga films prepared by sputtering method Peer-reviewed

M. Ohtsuka, K. Chiba, M. Matsumoto, K. Itagaki

SECOND INTERNATIONAL CONFERENCE ON PROCESSING MATERIALS FOR PROPERTIES　301-306　2000
還元拡散法による希土類-ニッケル系水素吸蔵合金粉末の直接製造 (特集金属素材プロセス次世代への展望) -- (ニオブ・タンタル・希土類金属)

板垣乙未生, 大塚誠

金属　69　(10)　881-887　1999/10
Publisher: アグネ技術センター
ISSN： 0368-6337
還元拡散法による希土類ーニッケル系水素吸蔵合金の直接製造

板垣乙未生, 大塚誠

金属　69　(10)　881-887　1999/04
〓

B. Wedel, A. Zakeri, C. Wedel, H. M. Henao, J. M. Font

東北大学素材工学研究所彙報 = Bulletin of the Institute for Advanced Materials Processing, Tohoku University　54　(1)　90-91　1999/03/26
Publisher: 東北大学素材工学研究所
ISSN： 0919-4827
〓

大塚誠

東北大学素材工学研究所彙報 = Bulletin of the Institute for Advanced Materials Processing, Tohoku University　53　(1)　137-137　1998/03/27
Publisher: 東北大学素材工学研究所
ISSN： 0919-4827
〓

B. Wedel, G. Roghani, A. Zakeri, R. U. Pagador, J. C. Font, H. M. Henao, C. Wedel

東北大学素材工学研究所彙報 = Bulletin of the Institute for Advanced Materials Processing, Tohoku University　53　(1)　108-109　1998/03/27
Publisher: 東北大学素材工学研究所
ISSN： 0919-4827
Structure and hydrogen-absorption properties of LaNi5 thin films prepared by a sputtering method

M Ohtsuka, K Harada, T Matsumoto, K Itagaki

VALUE-ADDITION METALLURGY　167-175　1998
<Review Article>Measurement of Mechanical Properties of Thin Films Using Nanoindentation

Makoto OHTSUKA, Toru MATSUMOTO, Tetsuro TOKUMOTO

Bulletin of the Institute for Advanced Materials Processing, Tohoku University　53　(1)　85-91　1997/12
Publisher: 東北大学素材工学研究所
ISSN： 0919-4827
Measurement of Mechanical Properties of Thin Films Using Nanoindentation.

大塚誠

The Bulletin of the Institute for Advanced Materials Processing, Tohoku Unrversity (Sozaiken Iho)　53　(1-2)　85-91　1997/04
〓

G. Roghani, A. Zakeri, R. U. Pagador, J. M. Lara, J. C. Font

東北大学素材工学研究所彙報 = Bulletin of the Institute for Advanced Materials Processing, Tohoku University　52　(1)　170-171　1997/03/28
Publisher: 東北大学素材工学研究所
ISSN： 0919-4827
スパッタリング法によるLaNi_5水素吸蔵合金薄膜の作製およびその評価

松本徹, 原田健太郎, 大塚誠, 板垣乙未生

資源・素材　1996　(1)　35-35　1996/10/21

ISSN： 0919-7915
気相制御研究分野 (1995. 1-1995. 12)(研究活動報告)

板垣乙未生, 日野光久, 大塚誠, 王乾坤, 宇都宮公昭, 原田健太郎, 藤田康世, 山内輝和, 菊地英幸, 中川原聡, 松本徹, 文南日, Roghani G., Surapunt S., Pagador R. U., Font J. C., Lara J. M.

東北大学素材工学研究所彙報 = Bulletin of the Institute for Advanced Materials Processing, Tohoku University　51　(1)　116-117　1995/12
Publisher: 東北大学素材工学研究所
ISSN： 0919-4827
HIGH TEMPERATURE CREEP OF ALPHA-2 TI-34MOL% AL POLYCRYSTALS

H OIKAWA, T FUKUDA, M OHTSUKA

HIGH-TEMPERATURE ORDERED INTERMETALLIC ALLOYS VI, PTS 1 AND 2　364　517-522　1995

ISSN： 0272-9172
Recent Studies on Hydrogen Storage LaNi_5 Alloy Films

Makoto OHTSUKA, ITAGAKI Kimio

Bulletin of the Institute for Advanced Materials Processing, Tohoku University　50　(1)　p88-96　1994/12
Publisher: 東北大学素材工学研究所
ISSN： 0919-4827
気相制御研究分野 (1994. 1-1994. 12) (研究活動報告)

板垣乙未生, 日野光久, 大塚誠, 周玉林, 王乾坤, 原田健太郎, 藤田康世, 山内輝和, Roghani G., Surapunt S., Pagador R. U., Nyamai C. M., Font J. C.

東北大学素材工学研究所彙報 = Bulletin of the Institute for Advanced Materials Processing, Tohoku University　50　(1)　198-199　1994/12
Publisher: 東北大学素材工学研究所
ISSN： 0919-4827
Recent Studies on Hydrogen Storage LaNi₅ Alloy Films.

大塚誠

The Bulletin of the Institute for Advanced Materials Processing, Tohoku University (Sozaiken Iho)　50　(1-2)　88-96　1994/04
〓

D. Y. Kim, S. Surapunt, R. R. Vazquez, C. M. Nyamai

東北大学素材工学研究所彙報 = Bulletin of the Institute for Advanced Materials Processing, Tohoku University　49　(1)　148-149　1994/03/30
Publisher: 東北大学素材工学研究所
ISSN： 0919-4827
〓

D. Y. Kim, S. Supachai, R. R. Vazquez

東北大学素材工学研究所彙報 = Bulletin of the Institute for Advanced Materials Processing, Tohoku University　48　(1)　174-175　1993/03/30
Publisher: 東北大学素材工学研究所
ISSN： 0919-4827
CREEP-BEHAVIOR OF TI-27 MOL-PERCENT AL INTERMETALLICS Peer-reviewed

M OHTSUKA, H OIKAWA

TITANIUM '92: SCIENCE AND TECHNOLOGY, VOLS 1-3　1123-1130　1993
MECHANISM OF REACTION-RATE ENHANCEMENT IN DIRECT PRODUCTION OF LANI5 BY REDUCTION-DIFFUSION METHOD

M OHTSUKA, DY KIM, K ITAGAKI

FIRST INTERNATIONAL CONFERENCE ON PROCESSING MATERIALS FOR PROPERTIES　203-206　1993

Show all ︎Show first 5

Books and Other Publications 8

Structure of Ni-Mn-Ga Films Prepared by Sputtering Method.

大塚誠

Processing Materials for Properties-II, The Minerals, Metals and Materials Society　2000/04
Structure and Hydrogen-Absorption Properties of LaNi₅ Thin Films Prepared by a Sputtering Method.

大塚誠

Valued-Addition Metallurgy, The Minerals, Metals and Materials Society,　1998/04
Fabrication of Ni₂MnGa Thin Film.

大塚誠

Proceedings of the Japan-France Seminar on Intelligent Materials and Structures　1997/04
High Temperature Creep of Alpha-two Ti-34 mol% Al Polycrystals.

大塚誠

High Temperature Ordered Intermetallics Alloys I, Materials Research Society　1995/04
Creep Behavior and Substructures of #Galpha#GR₂ Ti-27 mol% Al Intermetallics.

大塚誠

Strength of Materials, The Japan Institute of Metals　1994/04
Creep Behavior of Ti-27 mol% Al Intermetallics.

大塚誠

Titanium '92, Science and Technology, The Minerals, Metals and Materials Society　1993/04
Creep Strength of the Alpha-two and the Gamma Phase in the Ti-Al system.

大塚誠

Proceedings of Japan International Symposium on Intermetallic Compounds for High-Temperature Structual Applications　1993/04
Mechanism of Reaction Rate Enhahcement in Direct Production of LaNi₅ by Reduction-Diffusion Method.

大塚誠

First International Conference on Processing Materials for Properties, The Minerals, Metals and Materials Society　1993/04

Show all Show first 5

Presentations 128

Fe-Cr-Ni合金溶液から成長したAlN結晶の成長形態に及ぼす温度の影響

新野田剛, 安達正芳, 大塚誠, 福山博之

第24回東北大学多元物質科学研究所研究発表会　2024/12/12
A new solution growth method of AlN single crystal using Fe-Cr flux International-presentation

Hiroyuki Fukuyama, Sen Li, Masayoshi Adachi, Makoto Ohtsuka

Tohoku-Melbourne Joint Workshop in Materials Science　2024/11/07
Thermophysical property measurement of Ti-Nb melts using electromagnetic levitation technique International-presentation

Masayoshi Adachi, Ryo Ogasawara, Makoto Ohtsuka, Hiroyuki Fukuyama

Tohoku-Melbourne Joint Workshop in Materials Science　2024/11/06
Synthesis of AlN Crystals by Solution Growth Method Using Fe-Cr-Ni Fluxes International-presentation

Go Shinnoda, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

The 11th Asia-Pacific Workshop on Widegap Semiconductors (APWS 2024)　2024/10/17
Effect of Cooling Rate on Solution Growth of AlN Crystal Using Fe-Cr-Ni Flux International-presentation

Makoto Ohtsuka, Go Shinnoda, Masayoshi Adachi, Hiroyuki Fukuyama

The 11th Asia-Pacific Workshop on Widegap Semiconductors (APWS 2024)　2024/10/17
New Solution Growth of AlN Single Crystals using Fe-Cr Based Fluxes International-presentation

Sen Li, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

The 11th Asia-Pacific Workshop on Widegap Semiconductors (APWS 2024)　2024/10/17
Development of a new solution growth method for AlN single crystals using Fe-Cr flux

李森, 安達正芳, 大塚誠, 福山博之

日本金属学会2024年秋期(第175回)講演大会　2024/09/20
溶融Fe-Cr-Ni合金を用いた溶液成長法によるAlN結晶成長に及ぼす基板回転の効果

大塚誠, 安達正芳, 福山博之

日本金属学会2024年秋期(第175回)講演大会　2024/09/20
電磁浮遊法を用いたTi-Nb合金融液の熱物性測定

安達正芳, 小笠原遼, 大塚誠, 福山博之

日本金属学会2024年秋期(第175回)講演大会　2024/09/19
ガスジェット浮遊法によるNi融体の表面張力および粘度測定

長草生真, 安達正芳, 大塚誠, 福山博之

日本金属学会2024年秋期(第175回)講演大会　2024/09/18
ナトリウム冷却高速炉の炉心損傷事故時の制御棒材の共晶溶融挙動に関する研究（39）電磁浮遊法によるその場観察と急冷法を組み合わせた30mass%B4C 含有SUS316L の凝固過程の解明

福山博之, 東英生, 大塚誠, 安達正芳, 山野秀将

日本原子力学会2024年秋の大会　2024/09/13
ナトリウム冷却高速炉の炉心損傷事故時の制御棒材の共晶溶融挙動に関する研究 (38) 黒体放射型超高温熱分析法による30mass%B4C 含有SUS316L の溶融挙動

東英生, 大塚誠, 安達正芳, 福山博之, 山野秀将

日本原子力学会2024年秋の大会　2024/09/13
ガスジェット浮遊法を用いた熱物性測定の検証のためのNi融体の粘性測定

安達正芳, 長草生真, 大塚誠, 渡邉匡人, 高橋純一, 福山博之

資源・素材2024（秋田）　2024/09/10
Melting and Solidification Behavior of Type 316L Austenitic Stainless Steel Containing 30mass% B4C International-presentation

Hiroyuki Fukuyama, Hideo Higashi, Masayoshi Adachi, Makoto Ohtsuka, Hidemasa Yamano

Twenty-Second Symposium on Thermophysical Properties (22nd STP)　2024/06/26
Density Measurement of Ti-Mo Melt Using Electromagnetic Levitation Technique International-presentation

Fuki Shinagawa, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

Twenty-Second Symposium on Thermophysical Properties (22nd STP)　2024/06/25
電磁浮遊法を用いたTi-Nb合金融液の垂直分光放射率測定

安達正芳, 小笠原遼, 大塚誠, 福山博之

日本金属学会2024年春期(第174回)講演大会および日本鉄鋼協会第187回春季講演大会共同セッション　2024/03/14
溶融Fe-Cr-Ni合金を用いた溶液成長法におけるAlN結晶の成長形態に及ぼす温度の影響

新野田剛, 安達正芳, 大塚誠, 福山博之

日本金属学会2024年春期(第174回)講演大会　2024/03/13
溶融Fe-Cr-Ni合金を用いた溶液成長法によるAlN結晶成長に及ぼす冷却速度の影響

大塚誠, 新野田剛, 安達正芳, 福山博之

日本金属学会2024年春期(第174回)講演大会　2024/03/13
Study of the phase diagram of MoSiBTiC alloys by optical thermal analysis and in-situ observation with electromagnetic levitation International-presentation

Xi Nan, Ryogo Sawada, Haruki Nakashima, Masayoshi Adachi, Makoto Ohtsuka, Kyosuke Yoshimi, Hiroyuki Fukuyama

MRM2023/IUMRS-ICA2023 Grand Meeting　2023/12/02
Density measurement of molten Ti-Mo using electromagnetic levitation technique International-presentation

Fuki Shinagawa, Masayoshi Adachi, Makoto Otsuka, Hiroyuki Fukuyama

National Taipei University of Technology & Tohoku University 2023 Joint Symposium　2023/12/11
Thermodynamic evaluation of solubility product of AlN in liquid Fe-Cr-Ni alloys for design of AlN solution growth method International-presentation

Go Shinnoda, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

National Taipei University of Technology & Tohoku University 2023 Joint Symposium　2023/12/11
Thermophysical property measurement of Ti-Nb melts using electromagnetic levitation technique International-presentation

Masayoshi Adachi, Ryo Ogasawara, Makoto Ohtsuka, Hiroyuki Fukuyama

The 1st Conference on Creation of Materials by Super-Thermal Field (CMSTF2023)　2023/11/16
Fabrication of AlN Single Crystal by Solution Growth Method using Ferritic Stainless Steel Flux International-presentation

Sen Li, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

14th International Conference on Nitride Semiconductors 2023 (ICNS2023)　2023/11/13
電磁浮遊法を用いた Fe-S 融体の密度・表面張力測定

安達正芳, 正岡諒也, 大塚誠, 福山博之

第44回日本熱物性シンポジウム　2023/11/09
Solution Growth of AlN single crystal in Fe-Cr flux

李森, 安達正芳, 大塚誠, 福山博之

2023/09/22
溶融Fe-Cr-Ni合金におけるAlN溶解度積の熱力学的検討

新野田剛, 安達正芳, 大塚誠, 福山博之

日本金属学会2023年秋期(第173回)講演大会　2023/09/22
Fe-Al 融液を原料とした針状 AlN 単結晶の気相成長における温度の影響

飴井千晃, 福山博之, 大塚誠, 安達正芳, 得地悠希

日本金属学会2023年秋期(第173回)講演大会　2023/09/22
静磁場印加電磁浮遊法を用いたSi-Ge融体の熱伝導率測定

新井佑梨, 福山博之, 大塚誠, 安達正芳

日本金属学会2023年秋期(第173回)講演大会　2023/09/22
電磁浮遊法によるTi-Nb合金融体の表面張力測定

小笠原遼, 安達正芳, 大塚誠, 福山博之

日本金属学会2023年秋期(第173回)講演大会　2023/09/22
ガスジェット浮遊法による銅マットの表面張力測定

高橋純一, 安達正芳, 正岡諒也, 大塚誠, 福山博之

資源・素材2023　2023/09/13
Emissivity-free two-dimensional radiation thermometry using a high-speed CCD camera International-presentation

Hidekazu Kobatake, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

22nd European Conference on Thermophysical Properties (ECTP2023)　2023/09/13
Specific heat capacities of Al-Si based alloys in a liquid state International-presentation

Hiroyuki Fukuyama, Hideo Higashi, Masayoshi Adachi, Makoto Ohtsuka, Manabu Watanabe

22nd European Conference on Thermophysical Properties (ECTP2023)　2023/09/12
Density and surface tension measurement of Ti-Nb melts using electromagnetic levitation technique International-presentation

Ryo Ogasawara, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

22nd European Conference on Thermophysical Properties (ECTP2023)　2023/09/11
Thermodynamic evaluation of solubility product of AlN in liquid Fe-Cr-Ni alloys for design of AlN solution growth method International-presentation

Go Shinnoda, Park Minsoo, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

22nd European Conference on Thermophysical Properties (ECTP2023)　2023/09/11
Solidification process of SS316L containing B4C by a combination of ultra-high temperature thermal analysis and microstructural observation International-presentation Invited

Hiroyuki Fukuyama, Hideo Higashi, Masayoshi Adachi, Makoto Ohtsuka, Hidemasa Yamano

2023/09/11
Surface tension measurement of Cu2S-FeS melts by aerodynamic and electromagnetic levitation techniques International-presentation

Masayoshi Adachi, Ryoya Masaoka, Masahito Watanabe, Makoto Ohtsuka, Jun-ichi Takahashi, Hiroyuki Fukuyama

22nd European Conference on Thermophysical Properties (ECTP2023)　2023/09/11
ナトリウム冷却高速炉の炉心損傷事故時の制御棒材の共晶溶融挙動に関する研究 (35) 電磁浮遊法によるその場観察と急冷法を組み合わせた14, 17 mass%B4C含有SUS316Lの凝固過程の解明

福山博之, 東英生, 大塚誠, 安達正芳, 山野秀将

日本原子力学会 2023年秋の大会　2023/09/06
ナトリウム冷却高速炉の炉心損傷事故時の制御棒材の共晶溶融挙動に関する研究 (34) 黒体放射型超高温熱分析法による14, 17 mass%B4C含有SUS316Lの溶融・凝固挙動の解析

東英生, 大塚誠, 安達正芳, 福山博之, 山野秀将

日本原子力学会 2023年秋の大会　2023/09/06
Multilayer Fe₃O₄ doped ITO indium saving indium tin oxide thin films sputtered on preheated substrates International-presentation International-coauthorship

Svitlana Petrovska, Ruslan Sergiienko, Bogdan Ilkiv, Takashi Nakamura, Makoto Ohtsuka

International research and practice conference “Nanotechnology and nanomaterials” NANO-2023　2023/08/18
Comparative study of RF sputtered Fe₂O₃- and Fe₃O₄-doped indium saving indium tin oxide thin films International-presentation International-coauthorship

Svitlana Petrovska, Ruslan Sergiienko, Bogdan Ilkiv, Takashi Nakamura, Makoto Ohtsuka

International research and practice conference “Nanotechnology and nanomaterials” NANO-2023　2023/08/18
Solidification paths and phase diagram of ZrC-added Mo-Si-B alloys International-presentation Invited

Hiroyuki Fukuyama, Tsukasa Nishikori, Makoto Ohtsuka, Kyosuke Yoshimi

Beyond Nickel-Based Superalloys IV International Conference　2023/06/28
Optical, Electrical Properties and Structure of Undoped and M₂O₃ (M=Fe, Al)-doped Multilayer Indium Saving Indium Tin Oxide Thin Films International-presentation International-coauthorship

Svitlana Petrovska, Ruslan Sergiienko, Bogdan Ilkiv, Takashi Nakamura, Makoto Ohtsuka

Мaterials and Technologies in Engineering (MTE-2023)　2023/05/17
静磁場印加電磁浮遊法を用いたSi-Ge融体の定圧モル熱容量測定

新井佑梨, 大塚誠, 安達正芳, 福山博之

日本金属学会2023年春期(第172回)講演大会　2023/03/10
Ni-Alフラックス法によるAlNの結晶成長挙動に及ぼす坩堝材の影響

朴珉秀, 大塚誠, 安達正芳, 福山博之

日本金属学会2023年春期(第172回)講演大会　2023/03/10
静磁場印加電磁浮遊法によるTi-Nb合金融体の密度測定

小笠原遼, 安達正芳, 大塚誠, 福山博之

日本金属学会2023年春期(第172回)講演大会　2023/03/09
静磁場印加電磁浮遊法を用いたFe-S融体の密度測定

安達正芳, 正岡諒也, 大塚誠, 福山博之

日本金属学会2023年春期(第172回)講演大会　2023/03/09
Synthesis of AlN Single Crystal by Solution Growth Method in SUS430 Flux

Sen Li, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

2023/03/09
Thermophysical properties of Al-Si based alloys in the molten state for thermal energy storage system design International-presentation Invited

Hiroyuki Fukuyama, Hideo Higashi, Masayoshi Adachi, Makoto Ohtsuka

2023/02/21
Crystal growth of AlN using metallic solutions

Go Shinnoda, Taichi Nagasaku, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

Tohoku-Melbourne Joing Workshop in Materials Science　2022/11/23
Vaper phase growth of needle-shaped AlN single crystals using Fe-Al melt as a source material

Chiaki Amei, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

Tohoku-Melbourne Joing Workshop in Materials Science　2022/11/23
Normal spectral emissivity and heat capacity measuremsnts of Si-Ge melts using the electromagnetic levitation method

Yuri Arai, Makoto Ohtsuka, Masayoshi Adachi, Hiroyuki Fukuyama

Tohoku-Melbourne Joing Workshop in Materials Science　2022/11/23
静磁場印加電磁浮遊法を用いた Si-Ge 融体の垂直分光放射率及びモル熱容量の測定

新井佑梨, 大塚誠, 安達正芳, 福山博之

第4回環境科学討論会　2022/10/28
Fe-Al 融液を原料とした気相成長による針状 AlN 単結晶の作製

飴井千晃, 得地悠希, 安達正芳, 大塚誠, 福山博之

第4回環境科学討論会　2022/10/28
電磁浮遊法による, Ti-Nb, 系合金融体の密度および表面張力測定

小笠原遼, 安達正芳, 大塚誠, 福山博之

第4回環境科学討論会　2022/10/28
Surface tension measurement of copper matte melts using an aerodynamic levitation technique

Masayoshi Adachi, Masahito Watanabe, Makoto Ohtsuka, Jun-ichi Takahashi, Hiroyuki Fukuyama

The 13th Asian Thermophysical Properties Conference (ATPC2022)　2022/09/28
Emissivity-free temperature measurement for electromagnetically levitated liquid metals using a dual-wavelength reflectance-ratio method

H. Kobatake, M. Iwabuchi, Y. Kurokawa, M. Ohtsuka, M. Adachi, H. Fukuyama, N. Sasajima, Y. Yamada

The 13th Asian Thermophysical Properties Conference (ATPC2022)　2022/09/28
固体BNを利用したNi-Al溶融合金からのAlN合成における高温反応挙動

大塚誠, 朴珉秀, 福山博之

日本金属学会2022年秋期(第171回)講演大会　2022/09/22
Growth Behavior of AlN on AlN/Sapphire Substrates by Solution Growth Using Molten Ni-Al Alloy

Minsoo PARK, Makoto OHTSUKA, Masayoshi ADACHI, Hiroyuki FUKUYAMA

2022/09/22
静磁場印加電磁浮遊法を用いたSi-Ge融体の垂直分光放射率測定

新井佑梨, 大塚誠, 安達正芳, 福山博之

日本金属学会2022年秋期(第171回)講演大会　2022/09/20
静磁場印加電磁浮遊法によるTi-Nb系合金融体の垂直分光放射率測定

小笠原遼, 安達正芳, 大塚誠, 福山博之

日本金属学会2022年秋期(第171回)講演大会　2022/09/20
ナトリウム冷却高速炉の炉心損傷事故時の制御棒材の共晶溶融挙動に関する研究 (31) 電磁浮遊法によるその場観察と急冷法を組み合わせた9－11mass%B4C含有SUS316Lの凝固過程の解明

福山博之, 東英生, 大塚誠, 安達正芳, 山野秀将

日本原子力学会 2022年秋の大会　2022/09/07
ナトリウム冷却高速炉の炉心損傷事故時の制御棒材の共晶溶融挙動に関する研究 (30) 黒体放射型超高温熱分析法による9－11mass%B4C含有SUS316Lの溶融挙動

東英生, 大塚誠, 安達正芳, 福山博之, 山野秀将

日本原子力学会 2022年秋の大会　2022/09/07
ガスジェット浮遊法を用いたCu2S-FeS融体の表面張力測定

安達正芳, 正岡諒也, 大塚誠, 渡邉匡人, 高橋純一, 福山博之

資源・素材2022　2022/09/06
Properties of multilayer aluminum-doped indium saving ITO thin films deposited by sputtering method International-presentation International-coauthorship

Svitlana Petrovska, Ruslan Sergiienko, Bogdan Ilkiv, Takashi Nakamura, Makoto Ohtsuka

International research and practice conference “Nanotechnology and nanomaterials” NANO-2022　2022/08/26
Iron-doped indium-saving indium tin oxide thin films deposited by DC sputtering method using Fe₃O₄ target International-presentation International-coauthorship

Svitlana Petrovska, Ruslan Sergiienko, Bogdan Ilkiv, Takashi Nakamura, Makoto Ohtsuka

International research and practice conference “Nanotechnology and nanomaterials” NANO-2022　2022/08/26
静磁場印加電磁浮遊法を用いたFe-10 mol% S融体の密度測定

正岡諒也, 安達正芳, 大塚誠, 福山博之

日本金属学会2022年春期 (第170回) 講演大会　2022/03/17
Ni-Alフラックスを用いた単結晶AlNの液相成長

永作太一, 安達正芳, 大塚誠, 福山博之

日本金属学会2022年春期 (第170回) 講演大会　2022/03/17
Fe-Al融液を原料とした針状AlN単結晶の成長

飴井千晃, 得地悠希, 安達正芳, 大塚誠, 福山博之

日本金属学会2022年春期 (第170回) 講演大会　2022/03/17
Ni-Al融液を用いたAlN/サファイアテンプレート基板上へのAlN成長

宮田麟太郎, 安達正芳, 大塚誠, 福山博之

日本金属学会2022年春期 (第170回) 講演大会　2022/03/16
Ni-AlフラックスからのAlNの結晶成長

安達正芳, 宮田麟太郎, 永作太一, 李森, 大塚誠, 福山博之

第21回東北大学多元物質科学研究所研究発表会　2021/10/09
Ni-Alを用いたAlN結晶の液相成長技術開発のための融液熱物性測定と熱流体解析

安達正芳, 藤田一輝, 大塚誠, 福山博之

日本金属学会2021年秋期 (第169回) 講演大会　2021/09/16
浮遊法を用いたCu2SおよびFeS融体の熱物性測定

安達正芳, 正岡諒也, 大塚誠, 渡邉匡人, 高橋純一, 福山博之

資源・素材 2021　2021/09/14
In-situ observation of AlN crystal formation on Ni-Al droplets by electromagnetic levitation technique

Zhou Xinyu, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

2021/06/09
In-situ observation of AlN formation behavior on Ni-30 mol% Al solution

Zhou Xinyu, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

2020/12/03
Low-Field Modeling of Heusler MultiPhysic Memory Alloys

Mickaël LALLART, Hiroyuki MIKI, Linjuan YAN, Gildas DIGUET, Makoto OHTSUKA, Gaël SEBALD

The 20th International Symposium on Advanced Fluid Information (AFI-2020)　2020/10/29
Fe-Al融液表面でのAlN結晶の生成・成長挙動

山形武史, 安達正芳, 大塚誠, 福山博之

日本金属学会2020年秋期(第167回)講演大会　2020/09/18
超高温X線回折によるMoSiBTiC合金の相生成・消滅過程の直接測定

大石泰生, 平尾直久, 福山博之, 大塚誠, 澤田龍伍, 中島治樹, 吉見享祐

日本金属学会2020年秋期(第167回)講演大会　2020/09/17
先端計測技術が拓く超高温材料科学 Invited

福山博之, 大塚誠, 吉見享祐

日本金属学会2020年秋期(第167回)講演大会　2020/09/17
2波長反射率比法による固体Pt球の放射率フリー温度測定

大塚誠, 合戸信之介, 笹嶋尚彦, 山田善郎, 福山博之

日本金属学会2020年秋期(第167回)講演大会　2020/09/17
溶融Co-Cr-Mo系合金の表面張力に及ぼす炭素組成の影響

今泉冴香, 大塚誠, 安達正芳, 渡邉学, 趙宇凡, 千葉晶彦, 小泉雄一郎, 福山博之

日本金属学会2020年秋期(第167回)講演大会　2020/09/17
溶融Ni-Al合金の半球全放射率の測定

藤田一輝, 安達正芳, 大塚誠, 福山博之

日本金属学会2020年秋期(第167回)講演大会　2020/09/17
ガスジェット浮遊技術を用いたCu2S融体の熱物性測定

安達正芳, 後藤宏樹, 大塚誠, 渡邉匡人, 高橋純一, 福山博之

資源・素材2020　2020/09/08
2波長反射率比法の電磁浮遊金属液滴への適用に向けた選択波長の影響

大塚誠, 合戸信之介, 笹嶋尚彦, 山田善郎, 福山博之

日本金属学会2020年春期(第166回)講演大会および日本鉄鋼協会第179回春季講演大会共同セッション　2020/03/19
Fe-Al融液からのAlN結晶成長のその場観察

山形武史, 安達正芳, 大塚誠, 福山博之

日本金属学会2020年春期(第166回)講演大会および日本鉄鋼協会第179回春季講演大会共同セッション　2020/03/19
Ni-Alフラックスを用いたAlN結晶成長

安達正芳, 神原新, 大塚誠, 福山博之

日本金属学会2020年春期(第166回)講演大会　2020/03/18
電磁浮遊法を用いた溶融Co-Cr-Mo系合金の表面張力測定

今泉冴香, 大塚誠, 安達正芳, 渡邉学, 趙宇凡, 小泉雄一郎, 千葉晶彦, 福山博之

日本金属学会2020年春期(第166回)講演大会　2020/03/17
ZrC添加Mo-Si-B合金の凝固経路の検討

錦織司, 大塚誠, 福山博之, 吉見享祐

第19回東北大学多元物質科学研究所研究発表会　2019/12/12
Mechanism of AlN Fabrication by Substitutional Reaction between Al Layer and GaN Substrate International-presentation

Marsetio Noorprajuda, Makoto Ohtsuka, Masayoshi Adachi, Hiroyuki Fukuyama

The 9th Asia-Pacific Workshop on Widegap Semiconductors (APWS2019)　2019/11/12
アクチュエータへの適用を目的とした形状記憶合金の材料改質 International-coauthorship

三木寛之, 武田翔, 大塚誠, Marcel Gültig, Manfred Kohl, 小助川博之, 高木敏行

日本機械学会 M&M2019材料⼒学カンファレンス　2019/11/02
放射率フリー温度計測法の電磁浮遊液滴への適用

大塚誠, 合戸信之介, 福山博之

人・環境と物質をつなぐイノベーション創出ダイナミック・アライアンス～環境エネルギー物質・デバイス・プロセス（G2）グループ分科会　2019/10/03
Cu₂S融体の非接触熱物性測定

安達正芳, 後藤宏基, 大塚誠, 高橋純一, 福山博之

資源・素材2019　2019/09/24
ZrC添加Mo-Si-B合金の凝固パスの検討

錦織司, 大塚誠, 福山博之, 吉見享祐

日本金属学会2019年秋期(第165回)講演大会　2019/09/12
2波長反射率比法の電磁浮遊液滴への適用にむけた課題抽出

合戸信之介, 大塚誠, 福山博之

日本金属学会2019年秋期(第165回)講演大会　2019/09/11
Ultrahigh-temperature thermal analysis combined with in-situ observation: Revealing solidification process of a MoSiBTiC alloy International-presentation

Hiroyuki Fukuyama, Ryogo Sawada, Haruki Nakashima, Makoto Ohtsuka, Kyosuke Yoshimi

Workshop on Ultrahigh Temperature Materials 2019　2019/06/17
AlN Formation by Substitutional Reaction between Al Layer and GaN Substrate

Marsetio Noorprajuda, Makoto Ohtsuka, Masayoshi Adachi, Hiroyuki Fukuyama

2019/06/14
ZrC添加Mo-Si-B合金における凝固パスの検討

錦織司, 大塚誠, 吉見享祐, 福山博之

一般社団法人資源・素材学会東北支部令和元年度春季大会　2019/06/14
2波長反射率比法による電磁浮遊Ni液滴の温度計測技術

合戸信之介, 岩渕将也, 大塚誠, 福山博之

一般社団法人資源・素材学会東北支部令和元年度春季大会　2019/06/14
Composition dependence of normal spectral emissivity of liquid Ni-Al alloys measured by electromagnetic levitation technique International-presentation

Masayoshi Adachi, Yuji Yamagata, Makoto Ohtsuka, Hiroyuki Fukuyama

12th International Workshop on Subsecond Thermophysics (IWSSTP 2019)　2019/06/06
Recent studies in material process and measurement with PROSPECT International-presentation

Hiroyuki Fukuyama, Manabu Watanabe, Masayoshi Adachi, Makoto Ohtsuka

12th International Workshop on Subsecond Thermophysics (IWSSTP2019)　2019/06/04
静磁場印加電磁浮遊法を用いた溶融Co-Cr-Mo系合金の熱伝導率測定

大塚誠, 高橋侑希, 小泉雄一郎, 趙宇凡, 千葉晶彦, 福山博之

日本金属学会2019年春期(第164回)講演大会　2019/03/21
Partial Phase Diagrams and Solidification Processes of TiC-added Mo-Si-B Alloys

H. Fukuyama, M. Ohtsuka, R. Sawada, H. Nakashima, K. Yoshimi

28th Annual Meeting of MRS-J　2018/12/19
Synthesis of Cu2S melt for surface tension measurement using electromagnetic levitation technique International-presentation

H. Goto, M. Adachi, M. Ohtsuka, H. Fukuyama

International Symposium on "New Horizon in Advanced Materials" Kick off Symposium of Academic Exchange　2018/12/03
Consideration of Complicated Solidification Paths of ZrC‐added Mo-Si-B Alloys International-presentation

T. Nishikori, M. Ohtsuka, K. Yoshimi, H. Fukuyama

International Symposium on "New Horizon in Advanced Materials" Kick off Symposium of Academic Exchange　2018/12/03
Applicatlon of Dual-Wavelength Reflectance-Ratio (DWR) Method to Electromagnetic Levitated Nickel Melt International-presentation

S. Gohto, M. Ohtsuka, M. Adachi, M. lwabuchi, H. Fukuyama

International Symposium on "New Horizon in Advanced Materials" Kick off Symposium of Academic Exchange　2018/12/03
Phase Diagrams and Solidification Paths of MoSiBTiC Alloys International-presentation

Ryogo Sawada, Makoto Ohtsuka, Haruki Nakashima, Kyosuke Yoshimi, Hiroyuki Fukuyama

2018 MRS Fall Meeting & Exhibit　2018/11/27
Effect of Polarity of GaN Substrate on AlN Formation Temperature by Substitutional Reaction between Al Layer and GaN Substrate

Marsetio Noorprajuda, Makoto Ohtsuka, Masayoshi Adachi, Hiroyuki Fukuyama

4th Intensive Discussion on Growth of Nitride Semiconductors (IDGN-4)　2018/11/20
AlN Formation by Interfacial Reaction between Al Layer and GaN Substrate International-presentation

Marsetio Noorprajuda, Makoto Ohtsuka, Masayoshi Adachi, Hiroyuki Fukuyama

International Workshop on Nitride Semiconductors (IWN 2018)　2018/11/15
2波長反射率比法による電磁浮遊液滴の放射率フリー温度測定

岩渕将也, 大塚誠, 福山博之, 小畠秀和, 笹嶋尚彦, 山田善郎

第39回日本熱物性シンポジウム　2018/11/13
溶融Ni-Al合金の垂直分光放射率測定

山片裕司, 大塚誠, 安達正芳, 福山博之

第39回日本熱物性シンポジウム　2018/11/13
Ni-Mn-X (X = Ga, In) 強磁性形状記憶合金膜の高機能化と新規デバイスへの展開

大塚誠

日本金属学会2018年秋期(第163回)講演大会　2018/09/20
静磁場印加電磁浮遊法を用いた溶融 Co-Cr-Mo 系合金の垂直分光放射率および定圧モル熱容量測定

高橋侑希, 大塚誠, 小泉雄一郎, 趙宇凡, 千葉晶彦, 福山博之

日本金属学会2018年秋期(第163回)講演大会　2018/09/20
Application of Dual-Wavelength Reflectance-Ratio Method to Electromagnetic Levitated Liquid Metals International-presentation

Iwabuchi Masaya, Kurokawa Yuma, Kobatake Hidekazu, Ohtsuka Makoto, Fukuyama Hiroyuki, Yamaguchi Yu, Sasajima Naohiko, Yamada Yoshiro

SICE Annual Conference 2018　2018/09/12
Effect of Reaction Temperature on AlN Formation at Interface of Al Layer Deposited on GaN Substrate

Marsetio Noorprajuda, Makoto Ohtsuka, Masayoshi Adachi, Hiroyuki Fukuyama

International Symposium on Growth of III-Nitrides (ISGN-7)　2018/08/07
In-Situ Observation of Liquid Phase Epitaxial Growth of an AlN Layer by Optical Microscopy International-presentation

Masayoshi Adachi, Keigo Fujiwara, Hidekazu Kobatake, Makoto Ohtsuka, Hiroyuki Fukuyama

Twentieth Symposium on Thermophysical Properties　2018/06/28
Density Measurement of a Co-Cr-Mo Melt with an Electromagnetic Levitation Technique in a Static Magnetic Field International-presentation

Yuki Takahashi, Makoto Ohtsuka, Yuichiro Koizumi, Yufan Zhao, Akihiko Chiba, Hiroyuki Fukuyama

Twentieth Symposium on Thermophysical Properties　2018/06/27
Measurements of Density and Evaporation Rate of Ti-6Al-4V Melt with a Electromagnetic Levitation Technique International-presentation

Suguru Funada, Makoto Ohtsuka, Hiroyuki Fukuyama

Twentieth Symposium on Thermophysical Properties　2018/06/26
静磁場印加電磁浮遊法を用いた溶融Ti-6Al-4V合金の密度・蒸発速度測定

船田卓, 大塚誠, 福山博之

日本鉄鋼協会第175回春季講演大会　2018/03/20
Ni-C共晶点による分光器の校正と溶融Ni-Al合金の垂直分光放射率測定

山片裕司, 大塚誠, 安達正芳, 福山博之

日本鉄鋼協会第175回春季講演大会　2018/03/20
Co-Cr-Mo系合金の液相線温度と溶融状態における密度の評価

高橋侑希, 大塚誠, 小泉雄一郎, 趙宇凡, 千葉晶彦, 福山博之

日本金属学会2018年春期(第162回)講演大会　2018/03/20
黒体放射を用いた熱分析法による10 mol%TiC含有Mo_ss-T₂-TiC合金の高温状態図の検討

澤田龍伍, 中島治樹, 大塚誠, 宮田龍一, 吉見享祐, 福山博之

日本金属学会2018年春期(第162回)講演大会　2018/03/20
静磁場印加電磁浮遊法を用いたMo_ss初晶MoSiBTiC合金浮遊液滴の凝固組織

大塚誠, 中島治樹, 澤田龍伍, 宮田龍一, 吉見享祐, 福山博之

日本金属学会2018年春期(第162回)講演大会　2018/03/20
２波長反射率比法による電磁浮遊金属液滴の温度測定

岩渕将也, 黒川佑馬, 小畠秀和, 大塚誠, 福山博之, 笹嶋尚彦, 山口祐, 山田善郎

日本金属学会2018年春期(第162回)講演大会　2018/03/19
電磁浮遊法を用いた溶融Ni-AlからのAlN生成その場観察

安達正芳, 浜谷苑子, 山片裕司, 大塚誠, 福山博之

第65回応用物理学会春季学術講演会　2018/03/18
Thickness Dependence on Crystalline Quality and Residual Stresses of AlN Films Deposited by Pulsed DC Reactive Sputtering

Noorprajuda Marsetio, Makoto Ohtsuka, Masayoshi Adachi, Hiroyuki Fukuyama

2018/03/18
ガスジェット浮遊法による溶融Niの粘度および表面張力測定

長草生真, 安達正芳, 大塚誠, 福山博之

2024 (令和6) 年度資源・素材学会東北支部総会・春季大会　2024/06/14
溶融Fe-Nb合金へのAlNの溶解平衡測定

南里駿也, 新野田剛, 大塚誠, 安達正芳, 福山博之

2024 (令和6) 年度資源・素材学会東北支部総会・春季大会　2024/06/14
Crystal plane dependence of single-crystalline AlN growth behavior from Ni-Al flux

Taichi Nagasaku, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

2021 Annual joint symposium Tohoku University & National Taipei University of Technology Exploration - Ezpansion - Acceleration　2021/11/30
Thermophysical property measurement and numerical heat and fluid flow simulation of liquid Ni-Al for development of AlN growth technique

Kazuki Fujita, Masayoshi Adachi, Makoto Ohtsuka, Hiroyuki Fukuyama

2020 ONLINE JOINT SYMPOSIUM Engineer a Better Tomorrow　2020/11/30

Show all Show first 5

Industrial Property Rights 14

窒化アルミニウム結晶の製造方法

安達正芳, 福山博之, 大塚誠, 神原新

特許第7599643号

Property Type: Patent
AlN単結晶の製造方法、AlN単結晶、およびAlN単結晶製造装置

福山博之, 大塚誠, 安達正芳, 宮田麟太郎, 渡邉康弘

特許第7448925号

Property Type: Patent
窒化アルミニウム結晶の製造方法

福山博之, 大塚誠, 安達正芳, マルセティオノープラジュダ, 菅野直樹

特許第7106108号

Property Type: Patent
透明導電積層体付基板及びその製造方法

中村崇, 大塚誠, ボイジンアラベナ, レアンドロ, アンドレス

特許第5780550号

Property Type: Patent
Substrate with Transparent Conductive Multilayer Structure and Process for Producing Same

中村崇, 大塚誠, ボイジンアラベナ, レアンドロ, アンドレス

Property Type: Patent

More details Close

Disclosed is a substrate which has a transparent conductive multilayer structure formed on a surface of the substrate and containing indium oxide, characterized in that the transparent conductive multilayer structure comprises a first transparent conductive film having an indium oxide content of 80-98 mass% and, formed on the surface of the first transparent conductive film, a second transparent conductive film having an indium oxide content of 45-75 mass%, and that the first transparent conductive film and the second transparent conductive film have crystals which are equal in crystal structure to the indium oxide crystals.
窒化アルミニウム単結晶の製造方法および窒化アルミニウム単結晶

福山博之, 大塚誠, 安達正芳, 李森, 新野田剛, 渡邉康弘

Property Type: Patent
AlN単結晶の製造方法およびAlN単結晶

福山博之, 大塚誠, 安達正芳, 朴 ▲民▼秀, 渡邉康弘

Property Type: Patent
窒化アルミニウム単結晶の製造方法および窒化アルミニウム単結晶製造装置

安達正芳, 福山博之, 大塚誠, 得地悠希, 飴井千晃

Property Type: Patent
AlN単結晶の製造方法、AlN単結晶、およびAlN単結晶製造装置

福山博之, 大塚誠, 安達正芳, 宮田麟太郎, 渡邉康弘

Property Type: Patent
窒化アルミニウム結晶の製造方法

安達正芳, 福山博之, 大塚誠, 神原新

Property Type: Patent
窒化アルミニウム結晶の製造方法

福山博之, 大塚誠, 安達正芳, マルセティオノープラジュダ, 菅野直樹

Property Type: Patent

More details Close

【課題】均一で大きい窒化アルミニウム結晶を、比較的容易に製造することができる窒化アルミニウム結晶の製造方法を提供する。【解決手段】GaN結晶とAlとを接触させ、GaN結晶中のGaとAlとの置換反応により窒化アルミニウム結晶を生成する。GaN結晶を、Alの融液またはAlを含む合金の融液に浸漬させ、置換反応により窒化アルミニウム結晶を生成してもよく、GaN結晶の表面にAlの膜を形成した後、熱処理を行い、置換反応により窒化アルミニウム結晶を生成してもよい。【選択図】図6
導電性酸化物及びその製造方法、並びにそれを用いた透明導電膜

中村崇, 柴田悦郎, 大塚誠

Property Type: Patent
Ni-Mn-Ga系形状記憶合金とその製造方法

内山博昭, 山内清, 高木敏行, 三木寛之, 大塚誠, 松本實

Property Type: Patent
Ni−Mn−Ga系形状記憶合金薄膜とその製造方法

内山博昭, 山内清, 高木敏行, 三木寛之, 大塚誠, 松本實

特許第4231188号

Property Type: Patent

Show all Show first 5

Research Projects 10

Mechanical Behavior and Structures of Ni-based Thin Films Competitive

System: The Other Research Programs

1997/04 - Present
Fabrication of Ferromagnetic Shape Memory Alloy Films and their Characteristics Competitive

System: Grant-in-Aid for Scientific Research

1997/04 - Present
Synthesis of hydrogen-transmissive thin alloy film and its mechanical Competitive

System: The Other Research Programs

1994/04 - Present
Direct Production of Functional Alloy Particles by Metallothermic Reduction Competitive

System: The Other Research Programs

1992/04 - Present
New concept for crystal growth of nitride semiconductors using extended degree of freedom

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

2021/04/05 - 2026/03/31
Fabrication of Metamagnetic Shape Memory Alloy Films and Development of Magnetic-Field Induced Actuator Materials

OHTSUKA Makoto, KAINUMA Ryosuke, TAKAGI Toshiyuki, KOYAMA Keiichi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2008 - 2010

More details Close

Ni-Mn-X (X=In, Sn) system alloy films as metamagnetic shape memory alloys were fabricated by sputtering method. After heat treatment, the films coincidentally showed the magnetic transformation and structural phase transformation (martensitic transformation). Their martensitic transformation temperatures became higher than room temperature and lower than the Curie temperature due to control of their compositions. The alloy films are expected as magnetic-field induced actuator materials, which enable the quick response and remote control.
Evaluation of Magnetic-Field Induced Shape Memory Effect in Ferromagnetic Shape Memory Alloy Films and its Mechanism

OHTSUKA Makoto, MURAKAMI Yasukazu, ITAGAKI Kimio

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2004 - 2006

More details Close

Ferromagnetic shape memory alloy is a multifunctional material with ferromagnetism and shape memory effect (SME), and is expected as a magnetic-field (MF) induced actuator material. The MF induced SME will enable the quick response and remote control. In the present study, the relation between the composition and SME was investigated for the Ni_2MnGa films. The films with various compositions were constraint-aged to make the two-way SME. The martensitic transformation (MT) temperature was higher than RT and lower than the Curie temperature (Tc) for the films. The mechanical properties are very important in the practical use. The effects of temperature and MF on mechanical properties of the films have been also investigated. Furthermore, the Fe addition as a ferromagnetic metal in the alloy will be effective for the improvement of magnetic properties and MF induced SME. The structure and SME of Fe-added films were investigated under the MF. The reversible two-way SME by the thermal change was confirmed for the all constraint-aged films through the MT and its reversion. The two-way SME by the MF up to 5 T was observed around the MT temperature on cooling for the constraint-aged film with the large gradient and the small thermal hysteresis in the strain-temperature curve. The MT temperatures decrease with increasing Fe content, while the Tc increases. The two-way SME by thermal change was also observed for the Fe-added films. The MF induced MT for the Fe-added film was evaluated by an XRD apparatus in high MF up to 5 T. It was confirmed the martensitic phase was stabilized by the MF. Furthermore, the MF induced SME for the Fe-added films was observed by the inducting the MT with MF around MT temperature on cooling. The strain change by the low MF of 1 T became large for the Fe added films.
多機能性ニッケル−マンガン−ガリウム合金薄膜の作製およびその特性評価

大塚誠

Offer Organization: 日本学術振興会

System: 科学研究費助成事業奨励研究(A)

Category: 奨励研究(A)

Institution: 東北大学

1998 - 1998
強磁性体形状記憶合金Ni_2MnGaの薄膜作製とマイクロアクチエーターの開発

松本實, 高木敏行, 谷順二, 大塚誠

Offer Organization: 日本学術振興会

System: 科学研究費助成事業萌芽的研究

Category: 萌芽的研究

Institution: 東北大学

1996 - 1998

More details Close

スパッタリング法により強磁性形状記憶合金Ni_2MnGa薄膜を作製し,物性を測定した.薄膜作製条件としてのターゲット組成,高周波電力,基板および基板温度などを種々変化させ,試料作製の最適条件を求めた.Ni,MnおよびGaの組成を変えたターゲットを用い,電力と膜厚および組成の関係を求めることにより合金組成の制御を行った.基板は無機および有機物を用い,基板温度と製膜条件を求めた.得られた薄膜は膜厚が1〜5μmで,ICPにより組成分析を行い,合金組成を決定した.スパッタリング法により結晶性の良い試料が得られたが,さらに熱処理を行い規則格子合金を作製した.物性としては変態温度,結晶構造とその温度変化および磁化の温度変化を示差走査熱量計,X線回折装置およびSQUID磁化測定装置を用いて測定した.その結果,変態温度(Ms,Mf,AsおよびAf)およびキューリー温度の値はバルク材と類似していることを明らかにした.また,バルク材と比べスパッタリングNi_2MnGa薄膜は脆性が小さい. 以上の結果,作製したスパッタリングNi_2MnGa薄膜はマイクロマシーンのマイクロアクチュエーターとして開発可能な素子である.
DEVELOPMENT OF A PROCESS FOR DIRECTLY PRODUCING Zr-Ni-Mn ALLOY POWDERS FOR HYDROGEN STORAGE BY METALLOTHERMIC REDUCTION METHOD

ITAGAKI Kimio, OHTSUKA Makoto, HINO Mitsuhisa

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: TOHOKU UNIVERSITY

1995 - 1996

More details Close

Aiming at the development of an efficient process to make Zr-Ni-Mn alloy powders directly from the oxide resources of zirconium and manganese by using metallic calcium as a reductant, the hydrogen-absorbing and -desorbing properties of the synthesized alloys and the mechanism of formation of the alloy were studied. Firstly, more than 50 kinds of Zr-Ni-Mn alloys were synthesized by arc-melting and their properties were investigated in relation to the microstructure and the compositions. It was clarified that the alloys with a single phase just before separating into two-phases have most favorable properties for hydrogen storage, with the compositions of 42.2%Zr, 29.9%Ni and 27.9%Mn or 44.4%Zr, 34.3%Ni and 21.3%Mn. Secondly, the alloy powders with the compositions of 44.4%Zr, 34.3%Ni and 21.3%Mn were prepared by the metallothermic reduction method. It was found that the alloys were formed through a heterogeneous reaction between nickel in the liquid Ni-Ca alloy phase and the solid Zr and Mn phases. This mechanism was quite defferent from that in making Ni-rare earth alloys by the same method. The properties of the produced alloys for hydrogen storage was found to be a little inferior to those of the alloys produced by the arc-melting. It was considered that the properties must improve by removing the oxide layr formed on the alloy powder which makes the transit of hydrogen atom difficult.

Show all Show first 5

Other 2

電磁形状記憶材料を用いた次世代マイクロアクチュエータデバイスの開発

More details Close

本研究では，電磁場を感知して動作する形状記憶合金材料を開発し，これをアクチュエータへ応用し，これまでにない多機能性を有する次世代マイクロアクチュエータ用デバイスを創製することを目的とする．
強磁性体形状記憶合金薄膜の機械的性質

More details Close

センサーやアクチュエータ用の形状記憶素子として本合金薄膜の実用化を考えた場合には，その機械的特性は非常に重要である．そこで，本研究では，スパッタ法によりNi－Mn－Gaスパッタ膜をアルミナ基板上に作製し，種々の熱処理を施して，組成，組織，構造に及ぼす作製条件の効果について調査し，得られた合金膜の機械的特性（硬さ，弾性定数）に及ぼす影響についてナノインデンテーション法により評価することを目的とした．