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Daisuke Morikawa

Section

Institute of Multidisciplinary Research for Advanced Materials

Job title

Assistant Professor

Degree

博士（理学）（東北大学）
修士（理学）（東北大学）

researchmap

https://researchmap.jp/daisuke_morikawa

J-GLOBAL ID

201801020640171196

ORCID

https://orcid.org/0000-0001-8110-7499

Research History 6

2023/02 - Present

Tohoku University
2022/10 - Present

Japan Science and Technology Agency
2019/06 - Present

RIKEN　Center for Emergent Matter Science
2018/04 - Present

Tohoku University　Institute of Multidisciplinary Research for Advanced Materials Division of Measurements
2017/04 - 2018/03

フンボルト大学ベルリン　特別研究員
2012/04 - 2017/03

RIKEN　Center for Emergent Matter Science

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Committee Memberships 5

日本結晶学会　情報幹事

2024/04 - Present
日本顕微鏡学会　その場観察分科会幹事

2023/04 - Present
日本結晶学会　行事委員

2020/04 - 2024/03
日本顕微鏡学会　若手研究部会幹事

2020/04 - 2023/03
日本物理学会　領域10運営委員

2019/04 - 2021/03

Professional Memberships 4

日本誘電体学会

2023/04 - Present
THE JAPANESE SOCIETY OF MICROSCOPY

2009/05 - Present
THE CRYSTALLOGRAPHIC SOCIETY OF JAPAN

2007/12 - Present
THE PHYSICAL SOCIETY OF JAPAN

2007/09 - Present

Research Interests 6

界面
強誘電体
収束電子回折
構造解析
電子回折
電子顕微鏡

Research Areas 5

Natural sciences / Semiconductors, optical and atomic physics /
Nanotechnology/Materials / Applied physics - general /
Nanotechnology/Materials / Nanomaterials /
Nanotechnology/Materials / Thin-film surfaces and interfaces /
Nanotechnology/Materials / Inorganic materials /

Awards 8

2025年度最優秀和文誌賞

2025/06　日本顕微鏡学会　ナノ電子プローブによる局所構造解析
第23回インテリジェント・コスモス奨励賞

2024/05　公益財団法人インテリジェント・コスモス学術振興財団
第40回(2023年度) 優秀発表賞

2023/10　日本誘電体学会　BaTiO3の90度ドメイン壁における分極の空間変化の直接観測
科学計測振興賞

2022/12　科学計測振興基金　収束電子回折法による局所構造解析の界面およびその場観察への応用
第23回（2022年度）日本顕微鏡学会奨励賞

2022/05　日本顕微鏡学会　収束電子回折法を用いた局所構造解析手法の開発と界面やその場観察への応用
Young Scientist Award of the Physical Society of Japan

2021/10
NIMS conference 2015 Poster award

2015/07　NIMS
AsCA Rising Stars Prize

2010/10　The Asian Crystallographic Association

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Papers 57

Crystal structures and phase stability of antiferroelectric R phases in undoped and Ca-modified sodium niobates

Seiyu Aso, Hiroki Matsuo, Yasuhiro Yoneda, Daisuke Morikawa, Kenji Tsuda, Kenji Ohoyama, Toru Ishigaki, Yuji Noguchi

Physical Review B　2025/05/19

DOI： 10.1103/PhysRevB.111.174114 　
Charge density analysis of strontium titanate using quantitative convergent-beam electron diffraction

Bikas Aryal, Mostafa Eid, Andrew E. Smith, Daisuke Morikawa, Tianyu Liu, Kenji Tsuda, Naruki Tsuji, Yoshiharu Sakurai, Sizhuo Yu, Jean-Michel Gillet, Laure Bourgeois, Philip N. H. Nakashima

Charge density analysis of strontium titanate using quantitative convergent-beam electron diffraction　2025
Publisher: ScienceOpen
DOI： 10.14293/apmc13-2025-0377 　
Crystal Structure and Charge Density Analysis at Twin Boundary using Multiple Convergent-beam Electron Diffraction Patterns

Daisuke Morikawa, Tianyu Liu, Kenji Tsuda

Crystal Structure and Charge Density Analysis at Twin Boundary using Multiple Convergent-beam Electron Diffraction Patterns　2025
Publisher: ScienceOpen
DOI： 10.14293/apmc13-2025-0383 　
Chirality Determination Using Qualitative Bijvoet Difference by 3D ED Analysis

Tianyu Liu, Daisuke Morikawa, Hirofumi Kurokawa, Shun Narai, Yusuke Seto, Koji Yonekura, Kenji Tsuda

Chirality Determination Using Qualitative Bijvoet Difference by 3D ED Analysis　2025
Publisher: ScienceOpen
DOI： 10.14293/apmc13-2025-0186 　
Observation of Thermally Induced Piezomagnetic Switching in Cu₂OSeO₃ Polymorph Synthesized under High‐Pressure

Hung‐Cheng Wu, Takuya Aoyama, Daisuke Morikawa, Daisuke Okuyama, Kazuhiro Nawa, Wei‐tin Chen, Chan‐Hung Lu, Tsung‐Wen Yen, Shin‐Ming Huang, Stuart Calder, Shuki Torii, Kenya Ohgushi, Masami Terauchi, Taku J. Sato

Advanced Physics Research　2024/08/05
Publisher: Wiley
DOI： 10.1002/apxr.202400054 　

ISSN： 2751-1200

eISSN： 2751-1200

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Abstract A polymorph of Cu₂OSeO₃ with the distorted kagome lattice is successfully obtained using the high‐pressure synthesis technique (Cu₂OSeO₃‐HP). The structural analysis using X‐ray and neutron powder diffraction suggests that the tetrahedral Cu²⁺ clusters [similar to those in Cu₂OSeO₃ ambient‐pressure phase (Cu₂OSeO₃‐AP)] exist in Cu₂OSeO₃‐HP but with three symmetry inequivalent sites. No structural change is observed between 1.5 K and the room temperature. The complex magnetic H‐T phase diagram is established based on the temperature‐ and field‐dependent magnetization data, indicating two distinct antiferromagnetic phases at low and intermediate temperatures, in addition to the higher‐temperature spin‐glass‐like phase. The low temperature phase is identified by neutron powder diffraction refinements as a canted noncollinear antiferromagnetic order with a weak ferromagnetic component along the b‐axis. Size of the refined ordered moment is ≈1.00(4) µ_B in Cu₂OSeO₃‐HP, indicating a large enhancement compared to that of Cu₂OSeO₃‐AP (≈0.61 µ_B). By applying a uniaxial stress, finite enhancement of weak ferromagnetic component in the noncollinear antiferromagnetic phase in Cu₂OSeO₃‐HP is observed, which is the clear evidence of the piezomagnetic effect. Interestingly, the sign of the induced magnetization changes on heating from the low‐temperature to the intermediate‐temperature phases, indicating a novel piezomagnetic switching effect in this compound.
Acoustic Oscillations on Piezoelectric Materials Excited by a GHz Pulsed Electron Beam

Yohei K Sato, Kenji Tsuda, Spencer A Reisbick, Daisuke Morikawa, Masami Terauchi, Yimei Zhu

Microscopy and Microanalysis　30　(Supplement_1)　2024/07/24
Publisher: Oxford University Press (OUP)
DOI： 10.1093/mam/ozae044.713 　

ISSN： 1431-9276

eISSN： 1435-8115
ナノ電子プローブによる局所構造解析

健治津田, 大輔森川

顕微鏡　2023/12/30

DOI： 10.11410/kenbikyo.58.3_111 　

ISSN： 1349-0958 2434-2386
Determination of the crystal structures of NdBaMn2O6 : Coexisting polar and nonpolar phases Peer-reviewed

Md Shafiqul Islam, Daisuke Morikawa, Shigeki Yamada, Bikas Aryal, Kenji Tsuda, Masami Terauchi

Physical Review B　108　L060104-1-L060104-6　2023/08/25

DOI： 10.1103/PhysRevB.108.L060104 　
High Oxide‐Ion Conductivity through the Interstitial Oxygen Site in Sillén Oxychlorides Peer-reviewed

Hiroshi Yaguchi, Daisuke Morikawa, Takashi Saito, Kenji Tsuda, Masatomo Yashima

Advanced Functional Materials　2023/07

DOI： 10.1002/adfm.202214082 　
Nanoscale coexistence of polar-nonpolar domains underlying oxygen storage properties in Ho(Mn,Ti)O3+δ Peer-reviewed

Hiroshi Nakajima, Kento Uchihashi, Hirofumi Tsukasaki, Daisuke Morikawa, Hiroyuki Tanaka, Tomohiro Furukawa, Kosuke Kurushima, Jun Yamasaki, Hiroki Ishibashi, Yoshiki Kubota, Atsushi Sakuda, Akitoshi Hayashi, Shigeo Mori

Physical Review Research　2023/06/30

DOI： 10.1103/PhysRevResearch.5.023203 　
Direct observation of rotation of polarization at 90-degree domain walls in BaTiO₃ Peer-reviewed

Daisuke Morikawa, Yuji Noguchi, Kenji Tsuda

Japanese Journal of Applied Physics　62　(SM)　SM1003-SM1003　2023/06/14
Publisher: {IOP} Publishing
DOI： 10.35848/1347-4065/acde5b 　

ISSN： 0021-4922 1347-4065

eISSN： 1347-4065

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<jats:title>Abstract</jats:title> <jats:p>The rotation of polarization at 90-degree domain walls in tetragonal BaTiO<jats:sub>3</jats:sub> was directly observed by the STEM-CBED method, which combines scanning transmission electron microscopy (STEM) and convergent-beam electron diffraction (CBED). The CBED patterns in the domain wall region exhibit continuous changes in intensity distribution within discs and specific features corresponding to the direction of the rotation of polarization. Simulations were performed using hypothetical superstructures created by continuously connecting Ti displacement with a 90-degree rotation and showed good qualitative agreement with the experimental patterns. The quantitative evaluation of the mirror symmetries existing in the tetragonal structure in bulk form revealed the width of the domain wall is approximately 9 nm. While distorted regions with slightly broken symmetry in CBED disks were found to extend further on both sides of the domain wall region in 6-7 nm. This finding can explain the discrepancy in the domain wall widths reported in previous studies.</jats:p>
Temperature dependence of crystal growth behavior of AlN on Ni–Al using electromagnetic levitation and computer vision technique Peer-reviewed

Masayoshi Adachi, Sonoko Hamaya, Daisuke Morikawa, Benjamin G. Pierce, Ahmad M. Karimi, Yuji Yamagata, Kenji Tsuda, Roger H. French, Hiroyuki Fukuyama

Materials Science in Semiconductor Processing　153　2023/01

DOI： 10.1016/j.mssp.2022.107167 　

ISSN： 1369-8001
Nickel-aluminium bronze cast into 3D sand printed moulds: Kappa II phase and segregation of phosphorus Peer-reviewed

S. Nusen, T. Chairuangsri, D. Morikawa, K. Tsuda, J.T.H. Pearce

Materialia　26　101631-101631　2022/12
Publisher: Elsevier {BV}
DOI： 10.1016/j.mtla.2022.101631 　

ISSN： 2589-1529
Topological Melting of the Metastable Skyrmion Lattice in the Chiral Magnet Co ₉ Zn ₉ Mn ₂ Peer-reviewed

Victor Ukleev, Daisuke Morikawa, Kosuke Karube, Akiko Kikkawa, Kiyou Shibata, Yasujiro Taguchi, Yoshinori Tokura, Taka‐hisa Arima, Jonathan S. White

Advanced Quantum Technologies　2200066-2200066　2022/09/13
Publisher: Wiley
DOI： 10.1002/qute.202200066 　

ISSN： 2511-9044

eISSN： 2511-9044
Space group determination and first-principles structure optimization of the A -site ordered perovskite-type manganite NdBaMn2O6 Peer-reviewed

Md Shafiqul Islam, Daisuke Morikawa, Shigeki Yamada, Bikas Aryal, Kenji Tsuda, Masami Terauchi

Physical Review B　105　(17)　174114　2022/05/31
Publisher: American Physical Society (APS)
DOI： 10.1103/PhysRevB.105.174114 　

ISSN： 2469-9950

eISSN： 2469-9969
Zigzag magnetic order in the Kitaev spin-liquid candidate material RuBr3 with a honeycomb lattice Peer-reviewed

Yoshinori Imai, Kazuhiro Nawa, Yasuhiro Shimizu, Wakana Yamada, Hideyuki Fujihara, Takuya Aoyama, Ryotaro Takahashi, Daisuke Okuyama, Takamasa Ohashi, Masato Hagihala, Shuki Torii, Daisuke Morikawa, Masami Terauchi, Takayuki Kawamata, Masatsune Kato, Hirotada Gotou, Masayuki Itoh, Taku J. Sato, Kenya Ohgushi

Physical Review B　105　(4)　2022/01/26

DOI： 10.1103/physrevb.105.l041112 　

ISSN： 2469-9950 2469-9969

eISSN： 2469-9969
Coexisting Z-type charge and bond order in metallic NaRu2O4 Peer-reviewed

Arvind Kumar Yogi, Alexander Yaresko, C. I. Sathish, Hasung Sim, Daisuke Morikawa, Juergen Nuss, Kenji Tsuda, Yukio. Noda, Daniel I. Khomskii, Je-Geun Park

Communications Materials　2022/01/20

DOI： 10.1038/s43246-022-00224-8 　
Electric-field response of polar nanodomains in BaTiO3 Peer-reviewed

D. Morikawa, K. Tsuda

Applied Physics Letters　119　(5)　052904-052904　2021/08/02
Publisher: AIP Publishing
DOI： 10.1063/5.0058977 　

ISSN： 0003-6951

eISSN： 1077-3118
Improvement of precision in refinements of structure factors using convergent-beam electron diffraction patterns taken at Bragg-excited conditions Peer-reviewed

B. Aryal, D. Morikawa, K. Tsuda, M. Terauchi

Acta Crystallographica Section A Foundations and Advances　77　(4)　289-295　2021/07/01
Publisher: International Union of Crystallography (IUCr)
DOI： 10.1107/s2053273321004137 　

eISSN： 2053-2733

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A local structure analysis method based on convergent-beam electron diffraction (CBED) has been used for refining isotropic atomic displacement parameters and five low-order structure factors with sin θ/λ ≤ 0.28 Å⁻¹ of potassium tantalate (KTaO₃). Comparison between structure factors determined from CBED patterns taken at the zone-axis (ZA) and Bragg-excited conditions is made in order to discuss their precision and sensitivities. Bragg-excited CBED patterns showed higher precision in the refinement of structure factors than ZA patterns. Consistency between higher precision and sensitivity of the Bragg-excited CBED patterns has been found only for structure factors of the outer zeroth-order Laue-zone reflections with larger reciprocal-lattice vectors. Correlation coefficients among the refined structure factors in the refinement of Bragg-excited patterns are smaller than those of the ZA ones. Such smaller correlation coefficients lead to higher precision in the refinement of structure factors.
Recent Development of Structure Analysis Using Convergent-Beam Electron Diffraction Invited Peer-reviewed

Daisuke MORIKAWA, Kenji TSUDA

Nihon Kessho Gakkaishi　63　(2)　135-142　2021/05/31
Publisher: The Crystallographic Society of Japan
DOI： 10.5940/jcrsj.63.135 　

ISSN： 0369-4585 1884-5576

eISSN： 1884-5576
Frustration-driven magnetic fluctuations as the origin of the low-temperature skyrmion phase in Co7Zn7Mn6 Peer-reviewed

V. Ukleev, K. Karube, P. M. Derlet, C. N. Wang, H. Luetkens, D. Morikawa, A. Kikkawa, L. Mangin-Thro, A. R. Wildes, Y. Yamasaki, Y. Yokoyama, L. Yu, C. Piamonteze, N. Jaouen, Y. Tokunaga, H. M. Rønnow, T. Arima, Y. Tokura, Y. Taguchi, J. S. White

npj Quantum Materials　6　(1)　2021/04

DOI： 10.1038/s41535-021-00342-5 　

eISSN： 2397-4648
Evaluation of accuracy in the determination of crystal structure factors using large-angle convergent-beam electron diffraction patterns Peer-reviewed

Daisuke Morikawa, Kenji Tsuda

Microscopy　70　(2)　178-185　2021/03/24
Publisher: Oxford University Press ({OUP})
DOI： 10.1093/jmicro/dfaa041 　

ISSN： 2050-5698

eISSN： 2050-5701

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<title>Abstract</title> The accuracy of electron density distribution analysis using large-angle convergent-beam electron diffraction (LACBED) patterns is evaluated for different convergence angles. An orbital ordered state of FeCr2O4 is used as an example of the analysis. Ideal orbital-ordered and non-ordered states are simulated by using orbital scattering factors. LACBED patterns calculated for the orbital-ordered state were used as hypothetical experimental data sets. Electron density distribution of the Fe 3d orbitals has been successfully reconstructed with a higher accuracy from LACBED patterns with convergence angles larger than 15.2 mrad, which is 4 times as large as that for conventional convergent-beam electron diffraction patterns. Excitation of particular Bloch waves with the aid of LACBED patterns has a key role in the accurate analysis of electron density distributions.
Local crystal symmetry and structure at CaTiO3 twin boundaries Peer-reviewed

D. Morikawa, K. Tsuda

Applied Physics Letters　118　(9)　092901-092901　2021/03/01
Publisher: AIP Publishing
DOI： 10.1063/5.0043851 　

ISSN： 0003-6951

eISSN： 1077-3118
Evaluation of TEM specimen quality prepared by focused ion beam using symmetry breaking index of convergent-beam electron diffraction Peer-reviewed

Daisuke Morikawa, Masaki Ageishi, Kaori Sato, Kenji Tsuda, Masami Terauchi

Microscopy　2021/01/15
Publisher: Oxford University Press (OUP)
DOI： 10.1093/jmicro/dfab002 　

ISSN： 2050-5698

eISSN： 2050-5701

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<title>Abstract</title> Degradation of the crystalline quality of transmission electron microscopy specimens in silicon prepared with different conditions has been examined using convergent-beam electron diffraction (CBED). The specimens are prepared using focused ion beam (FIB) with different accelerating voltages, Ar-ion milling and crushing method. Symmetry breaking of CBED patterns was quantitatively evaluated by symmetry breaking index S, which has been previously reported. The degradation and inhomogeneity of the FIB specimen were suppressed by decreasing the accelerating voltages of the FIB fabrication in the final process.
Visualization of ferroaxial domains in an order-disorder type ferroaxial crystal Peer-reviewed

T. Hayashida, Y. Uemura, K. Kimura, S. Matsuoka, D. Morikawa, S. Hirose, K. Tsuda, T. Hasegawa, T. Kimura

Nature Communications　11　(1)　2020/12
Publisher: Springer Science and Business Media {LLC}
DOI： 10.1038/s41467-020-18408-6 　

eISSN： 2041-1723

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<title>Abstract</title> Ferroaxial materials that exhibit spontaneous ordering of a rotational structural distortion with an axial vector symmetry have gained growing interest, motivated by recent extensive studies on ferroic materials. As in conventional ferroics (e.g., ferroelectrics and ferromagnetics), domain states will be present in the ferroaxial materials. However, the observation of ferroaxial domains is non-trivial due to the nature of the order parameter, which is invariant under both time-reversal and space-inversion operations. Here we propose that NiTiO₃ is an order-disorder type ferroaxial material, and spatially resolve its ferroaxial domains by using linear electrogyration effect: optical rotation in proportion to an applied electric field. To detect small signals of electrogyration (order of 10⁻⁵ deg V⁻¹), we adopt a recently developed difference image-sensing technique. Furthermore, the ferroaxial domains are confirmed on nano-scale spatial resolution with a combined use of scanning transmission electron microscopy and convergent-beam electron diffraction. Our success of the domain visualization will promote the study of ferroaxial materials as a new ferroic state of matter.
Metamagnetic transitions and magnetoelectric responses in the chiral polar helimagnet Ni2InSbO6 Peer-reviewed

Y. Araki, T. Sato, Y. Fujima, N. Abe, M. Tokunaga, S. Kimura, D. Morikawa, V. Ukleev, Y. Yamasaki, C. Tabata, H. Nakao, Y. Murakami, H. Sagayama, K. Ohishi, Y. Tokunaga, T. Arima

Physical Review B　102　(5)　2020/08/05
Publisher: American Physical Society (APS)
DOI： 10.1103/PhysRevB.102.054409 　

ISSN： 2469-9950

eISSN： 2469-9969
Structural and Li-ion diffusion properties of lithium tantalum phosphate LiTa2PO8 Peer-reviewed

Norikazu Ishigaki, Kunimitsu Kataoka, Daisuke Morikawa, Masami Terauchi, Kikuko Hayamizu, Junji Akimoto

SOLID STATE IONICS　351　115314-115314　2020/08

DOI： 10.1016/j.ssi.2020.115314 　

ISSN： 0167-2738

eISSN： 1872-7689
Structural-transition-driven antiferromagnetic to spin-glass transition in Cd-Mg-Tb 1/1 approximants. International-journal Peer-reviewed

Farid Labib, Daisuke Okuyama, Nobuhisa Fujita, Tsunetomo Yamada, Satoshi Ohhashi, Daisuke Morikawa, Kenji Tsuda, Taku J Sato, An-Pang Tsai

Journal of physics. Condensed matter : an Institute of Physics journal　2020/07/24

DOI： 10.1088/1361-648X/aba921 　

ISSN： 1361-648X

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The magnetic susceptibility of the 1/1 approximants to icosahedral quasicrystals in a series of Cd85-xMgxTb15 (x = 5, 10, 15, 20) alloys was investigated in detail. The occurrence of antiferromagnetic to spin-glass-like transition was noticed by increasing Mg. Transmission electron microscopy analysis evidenced a correlation between the magnetic transition and suppression of the monoclinic superlattice ordering with respect to the orientation of the Cd4 tetrahedron at T > 100 K. The possible origins of this phenomenon were discussed in detail. The occurrence of the antiferromagnetic to spin-glass-like magnetic transition is associated with the combination of chemical disorder due to a randomized substitution of Cd with Mg and the orientational disorder of the Cd4 tetrahedra.
Motion tracking of 80-nm-size skyrmions upon directional current injections Peer-reviewed

X. Z. Yu, D. Morikawa, K. Nakajima, K. Shibata, N. Kanazawa, T. Arima, N. Nagaosa, Y. Tokura

Science Advances　6　(25)　eaaz9744-eaaz9744　2020/06
Publisher: American Association for the Advancement of Science (AAAS)
DOI： 10.1126/sciadv.aaz9744 　

eISSN： 2375-2548

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Nanometer-scale skyrmions are prospective candidates for information bits in low–power consumption devices owing to their topological nature and controllability with low current density. Studies on skyrmion dynamics in different classes of materials have exploited the topological Hall effect and current-driven fast motion of skyrmionic bubbles. However, the small current track motion of a single skyrmion and few-skyrmion aggregates remains elusive. Here, we report the tracking of creation and extinction and motion of 80-nm-size skyrmions upon directional one–current pulse excitations at low current density of the order of 10⁹ A m⁻² in designed devices with the notched hole. The Hall motion of a single skyrmion and the torque motions of few-skyrmion aggregates have been directly revealed. The results exemplify low–current density controls of skyrmions, which will pave the way for the application of skyrmions.
Determination of crystallographic chirality of MnSi thin film grown on Si (111) substrate Peer-reviewed

Daisuke Morikawa, Yuichi Yamasaki, Naoya Kanazawa, Tomoyuki Yokouchi, Yoshinori Tokura, Taka-hisa Arima

PHYSICAL REVIEW MATERIALS　4　(1)　2020/01

DOI： 10.1103/PhysRevMaterials.4.014407 　

ISSN： 2475-9953
Electron diffraction study of crystal structures of (Sr1−xBax)2Nb2O7 Peer-reviewed

Bikas Aryal, Daisuke Morikawa, Kenji Tsuda, Shinya Tsukada, Yukikuni Akishige, Masami Terauchi

Physical Review Materials　3　(4)　2019/04/12

DOI： 10.1103/physrevmaterials.3.044405 　

ISSN： 2475-9953

eISSN： 2475-9953
Element-specific soft x-ray spectroscopy, scattering, and imaging studies of the skyrmion-hosting compound Co8Zn8Mn4 Peer-reviewed

V. Ukleev, Y. Yamasaki, D. Morikawa, K. Karube, K. Shibata, Y. Tokunaga, Y. Okamura, K. Amemiya, M. Valvidares, H. Nakao, Y. Taguchi, Y. Tokura, T. Arima

Physical Review B　99　(14)　2019/04/10

DOI： 10.1103/physrevb.99.144408 　

ISSN： 2469-9950

eISSN： 2469-9969
Disordered skyrmion phase stabilized by magnetic frustration in a chiral magnet. International-journal Peer-reviewed

Kosuke Karube, Jonathan S White, Daisuke Morikawa, Charles D Dewhurst, Robert Cubitt, Akiko Kikkawa, Xiuzhen Yu, Yusuke Tokunaga, Taka-Hisa Arima, Henrik M Rønnow, Yoshinori Tokura, Yasujiro Taguchi

Science advances　4　(9)　eaar7043　2018/09

DOI： 10.1126/sciadv.aar7043 　

ISSN： 2375-2548
Aggregation and collapse dynamics of skyrmions in a non-equilibrium state Peer-reviewed

Xiuzhen Yu, Daisuke Morikawa, Tomoyuki Yokouchi, Kiyou Shibata, Naoya Kanazawa, Fumitaka Kagawa, Taka-hisa Arima, Yoshinori Tokura

Nature Physics　14　(8)　832-836　2018/08/28

DOI： 10.1038/s41567-018-0155-3 　

ISSN： 1745-2473

eISSN： 1745-2481
Current-induced dynamics of skyrmion strings. International-journal Peer-reviewed

Tomoyuki Yokouchi, Shintaro Hoshino, Naoya Kanazawa, Akiko Kikkawa, Daisuke Morikawa, Kiyou Shibata, Taka-Hisa Arima, Yasujiro Taguchi, Fumitaka Kagawa, Naoto Nagaosa, Yoshinori Tokura

Science advances　4　(8)　eaat1115　2018/08

DOI： 10.1126/sciadv.aat1115 　

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Dynamics of string-like objects is an important issue in a broad range of physical systems, including vortex lines in superconductors, viscoelastic polymers, and superstrings in elementary particle physics. In noncentrosymmetric magnets, string forms of magnetic skyrmions are present as topological spin objects, and their current-induced dynamics has recently attracted intense interest. We show in the chiral magnet MnSi that the current-induced deformation dynamics of skyrmion strings results in transport response associated with the real-space Berry phase. Prominent nonlinear Hall signals emerge above the threshold current only in the skyrmion phase. We clarify the mechanism for these nonlinear Hall signals by adopting spin density wave picture to describe the moving skyrmion lattice; deformation of skyrmion strings occurs in an asymmetric manner due to the Dzyaloshinskii-Moriya interaction, which leads to the nonreciprocal nonlinear Hall response originating from an emergent electromagnetic field. This finding reveals the dynamical nature of string-like objects and consequent transport outcomes in noncentrosymmetric systems.
Emergence of Topological Hall Effect in Half-Metallic Manganite Thin Films by Tuning Perpendicular Magnetic Anisotropy Peer-reviewed

Masao Nakamura, Daisuke Morikawa, Xiuzhen Yu, Fumitaka Kagawa, Taka-hisa Arima, Yoshinori Tokura, Masashi Kawasaki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　87　(7)　2018/07

DOI： 10.7566/JPSJ.87.074704 　

ISSN： 0031-9015
Coherent Resonant Soft X-ray Scattering Study of Magnetic Textures in FeGe Peer-reviewed

Victor Ukleev, Yuichi Yamasaki, Daisuke Morikawa, Naoya Kanazawa, Yoshihiro Okamura, Hironori Nakao, Yoshinori Tokura, Taka-hisa Arima

QUANTUM BEAM SCIENCE　2　(1)　2018/03

DOI： 10.3390/qubs2010003 　

eISSN： 2412-382X
Electrical magnetochiral effect induced by chiral spin fluctuations Peer-reviewed

T. Yokouchi, N. Kanazawa, A. Kikkawa, D. Morikawa, K. Shibata, T. Arima, Y. Taguchi, F. Kagawa, Y. Tokura

NATURE COMMUNICATIONS　8　2017/10

DOI： 10.1038/s41467-017-01094-2 　

ISSN： 2041-1723
Directional electric-field induced transformation from skyrmion lattice to distinct helices in multiferroic Cu2OSeO3 Peer-reviewed

Y. Okamura, Y. Yamasaki, D. Morikawa, T. Honda, V. Ukleev, H. Nakao, Y. Murakami, K. Shibata, F. Kagawa, S. Seki, T. Arima, Y. Tokura

PHYSICAL REVIEW B　95　(18)　2017/05

DOI： 10.1103/PhysRevB.95.184411 　

ISSN： 2469-9950

eISSN： 2469-9969
Deformation of Topologically-Protected Supercooled Skyrmions in a Thin Plate of Chiral Magnet Co8Zn8Mn4. International-journal Peer-reviewed

Daisuke Morikawa, Xiuzhen Yu, Kosuke Karube, Yusuke Tokunaga, Yasujiro Taguchi, Taka-Hisa Arima, Yoshinori Tokura

Nano letters　17　(3)　1637-1641　2017/03/08

DOI： 10.1021/acs.nanolett.6b04821 　

ISSN： 1530-6984

eISSN： 1530-6992
Topological spin-hedgehog crystals of a chiral magnet as engineered with magnetic anisotropy Peer-reviewed

Kanazawa, N., White, J. S., Rønnow, H. M., Dewhurst, C. D., Morikawa, D., Shibata, K., Arima, T., Kagawa, F., Tsukazaki, A., Kozuka, Y., Ichikawa, M., Kawasaki, M., Tokura, Y.

Physical Review B　96　(22)　220414-220414　2017

DOI： 10.1103/PhysRevB.96.220414 　

ISSN： 2469-9950

eISSN： 2469-9969
Spin-wave spectroscopy of the Dzyaloshinskii-Moriya interaction in room-temperature chiral magnets hosting skyrmions Peer-reviewed

Takagi, R., Morikawa, D., Karube, K., Kanazawa, N., Shibata, K., Tatara, G., Tokunaga, Y., Arima, T., Taguchi, Y., Tokura, Y., Seki, S.

Physical Review B　95　(22)　2017

DOI： 10.1103/PhysRevB.95.220406 　

ISSN： 2469-9950

eISSN： 2469-9969
Skyrmion formation in a bulk chiral magnet at zero magnetic field and above room temperature Peer-reviewed

Karube, K., White, J. S., Morikawa, D., Bartkowiak, M., Kikkawa, A., Tokunaga, Y., Arima, T., Rønnow, H. M., Tokura, Y., Taguchi, Y.

Physical Review Materials　1　(7)　074405-074405　2017

DOI： 10.1103/PhysRevMaterials.1.074405 　

ISSN： 2475-9953
Emergence and magnetic-field variation of chiral-soliton lattice and skyrmion lattice in the strained helimagnet Cu2OSeO3 Peer-reviewed

Okamura, Y., Yamasaki, Y., Morikawa, D., Honda, T., Ukleev, V., Nakao, H., Murakami, Y., Shibata, K., Kagawa, F., Seki, S., Arima, T., Tokura, Y.

Physical Review B　96　(17)　2017

DOI： 10.1103/PhysRevB.96.174417 　

ISSN： 2469-9950

eISSN： 2469-9969
Current-Induced Nucleation and Annihilation of Magnetic Skyrmions at Room Temperature in a Chiral Magnet International-journal Peer-reviewed

Yu, Xiuzhen, Morikawa, Daisuke, Tokunaga, Yusuke, Kubota, Masashi, Kurumaji, Takashi, Oike, Hiroshi, Nakamura, Masao, Kagawa, Fumitaka, Taguchi, Yasujiro, Arima, Taka-hisa, Kawasaki, Masashi, Tokura, Yoshinori

Advanced Materials　29　(21)　2017

DOI： 10.1002/adma.201606178 　

ISSN： 0935-9648

eISSN： 1521-4095
Lorentz transmission electron microscopy on nanometric magnetic bubbles and skyrmions in bilayered manganites La1.2Sr1.8(Mn1−yRuy)2O7 with controlled magnetic anisotropy Peer-reviewed

D. Morikawa, X. Z. Yu, Y. Kaneko, Y. Tokunaga, T. Nagai, K. Kimoto, T. Arima, Y. Tokura

Applied Physics Letters　107　(21)　212401-212401　2015/11/23

DOI： 10.1063/1.4936078 　

ISSN： 0003-6951

eISSN： 1077-3118
Variation of skyrmion forms and their stability in MnSi thin plates Peer-reviewed

Yu, Xiuzhen, Kikkawa, Akiko, Morikawa, Daisuke, Shibata, Kiyou, Tokunaga, Yusuke

Physical Review B　91　(5)　2015

DOI： 10.1103/PhysRevB.91.054411 　

ISSN： 2469-9950

eISSN： 2469-9969
Ferroelectric-like metallic state in electron doped BaTiO3 Peer-reviewed

Fujioka, J., Doi, a, Okuyama, D., Morikawa, D., Arima, T., Okada, K. N., Kaneko, Y., Fukuda, T., Uchiyama, H., Ishikawa, D., Baron, a Q. R., Kato, K., Takata, M., Tokura, Y.

Scientific Reports　5　13207-13207　2015

DOI： 10.1038/srep13207 　

ISSN： 2045-2322
Dynamical process of skyrmion-helical magnetic transformation of the chiral-lattice magnet FeGe probed by small-angle resonant soft x-ray scattering Peer-reviewed

Yamasaki, Y., Morikawa, D., Honda, T., Nakao, H., Murakami, Y., Kanazawa, N., Kawasaki, M., Arima, T., Tokura, Y.

Physical Review B　92　(22)　220421-220421　2015

DOI： 10.1103/PhysRevB.92.220421 　

ISSN： 1098-0121

eISSN： 1550-235X
A new class of chiral materials hosting magnetic skyrmions beyond room temperature Peer-reviewed

Tokunaga, Y., Yu, X. Z., White, J. S., Rønnow, H. M., Morikawa, D., Taguchi, Y., Tokura, Y.

Nature Communications　6　(May)　7638-7638　2015

DOI： 10.1038/ncomms8638 　

ISSN： 2041-1723
Valley-dependent spin polarization in bulk MoS2 with broken inversion symmetry Peer-reviewed

Suzuki, R., Sakano, M., Zhang, Y. J., Akashi, R., Morikawa, D., Harasawa, A., Yaji, K., Kuroda, K., Miyamoto, K., Okuda, T., Ishizaka, K., Arita, R., Iwasa, Y.

Nature Nanotechnology　9　(8)　611-617　2014

DOI： 10.1038/NNANO.2014.148 　

ISSN： 1748-3387

eISSN： 1748-3395
Evolution of magnetic and structural transitions and enhancement of magnetocaloric effect in Fe1-xMnx V2O4 Peer-reviewed

Choudhury, D., Suzuki, T., Okuyama, D., Morikawa, D., Kato, K., Takata, M., Kobayashi, K., Kumai, R., Nakao, H., Murakami, Y., Bremholm, M., Iversen, B. B., Arima, T., Tokura, Y., Taguchi, Y.

Physical Review B　89　(10)　2014

DOI： 10.1103/PhysRevB.89.104427 　

ISSN： 1098-0121

eISSN： 1550-235X
Towards control of the size and helicity of skyrmions in helimagnetic alloys by spin-orbit coupling Peer-reviewed

Shibata, K., Yu, X. Z., Hara, T., Morikawa, D., Kanazawa, N., Kimoto, K., Ishiwata, S., Matsui, Y., Tokura, Y.

Nature Nanotechnology　8　(10)　723-728　2013

DOI： 10.1038/nnano.2013.174 　

ISSN： 1748-3387

eISSN： 1748-3395
Crystal chirality and skyrmion helicity in MnSi and (Fe, Co)Si as determined by transmission electron microscopy Peer-reviewed

Morikawa, D., Shibata, K., Kanazawa, N., Yu, X. Z., Tokura, Y.

Physical Review B　88　(2)　2013

DOI： 10.1103/PhysRevB.88.024408 　

ISSN： 1098-0121

eISSN： 1550-235X
Charge and Orbital Order Patterns in an A-Site Ordered Perovskite-Type Manganite SmBaMn2O6 Determined by Convergent-Beam Electron Diffraction Peer-reviewed

Daisuke Morikawa, Kenji Tsuda, Youichi Maeda, Shigeki Yamada, Taka-hisa Arima

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN　81　(9)　2012/09

DOI： 10.1143/JPSJ.81.093602 　

ISSN： 0031-9015
Analysis of the Dislocation and Polarity in an AlN Layer Grown Using Ga-Al Flux Peer-reviewed

Adachi, Masayoshi, Takasugi, Mari, Morikawa, Daisuke, Tsuda, Kenji, Tanaka, Akikazu, Fukuyama, Hiroyuki

Applied Physics Express　5　(10)　2012

DOI： 10.1143/APEX.5.101001 　

ISSN： 1882-0778
Direct observation of orbital ordering in the spinel oxide FeCr2O4 through electrostatic potential using convergent-beam electron diffraction Peer-reviewed

Tsuda, K., Morikawa, D., Watanabe, Y., Ohtani, S., Arima, T.

Physical Review B　81　(18)　2010

DOI： 10.1103/PhysRevB.81.180102 　

ISSN： 1098-0121

Show all ︎Show first 5

Misc. 33

Robust magnetic-field-free skyrmions above room temperature in a bulk chiral magnet (Conference Presentation)

Kosuke Karube, Jonathan S. White, Marek Bartkowiak, Daisuke Morikawa, Xiuzhen Yu, Akiko Kikkawa, Yusuke Tokunaga, Takahisa Arima, Henrik M. Rønnow, Yoshinori Tokura, Yasujiro Taguchi

Spintronics XI　2018/09/18
Publisher: SPIE
DOI： 10.1117/12.2319900 　
Novel skyrmion phase stabilized by frustration in a β-Mn-type chiral magnet

Karube K., Rønnow H. M., Tokura Y., Taguchi Y., White J. S., Morikawa D., Dewhurst C. D., Cubitt R., Kikkawa A., Yu X. Z., Tokunaga Y., Arima T.

Meeting Abstracts of the Physical Society of Japan　73　(0)　2320-2320　2018
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.73.1.0_2320 　
Second-harmonic Hall effect in skyrmion phase of MnSi

Yokouchi T., Kanazawa N., Kikkawa A., Morikawa D., Shibata K., Arima T., Taguchi Y., Kagawa F., Tokura Y.

Meeting Abstracts of the Physical Society of Japan　72　(0)　1231-1231　2017
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.72.1.0_1231 　
Electrical magnetochiral effect in the partial order phase of B20-type MnSi

Yokouchi T., Kanazawa N., Kikkawa A., Morikawa D., Shibata K., Arima T., Taguchi Y., Kagawa F., Tokura Y.

Meeting Abstracts of the Physical Society of Japan　72　(0)　1659-1659　2017
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.72.2.0_1659 　
Metastable skyrmions at room temperature and zero magnetic field in Co₉Zn₉Mn₂ bulk sample

Karube K., Taguchi Y., White J. S., Morikawa D., Bartkowiak M., Kikkawa A., Tokunaga Y., Arima T., Rønnow H. M., Tokura Y.

Meeting Abstracts of the Physical Society of Japan　72　(0)　1653-1653　2017
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.72.2.0_1653 　
Magnetic structure of chiral polar magnet Ni₂InSbO₆

Araki Yusuke, Tabata Chihiro, Nakao Hironori, Murakami Yoichi, Tokunaga Yusuke, Arima Taka-hisa, Sato Tatsuki, Fujima Yuri, Abe Nobuyuki, Tokunaga Masashi, Kimura Shojiro, Morikawa Daisuke, Victor Ukleev, Yamasaki Yuichi

Meeting Abstracts of the Physical Society of Japan　72　(0)　1777-1777　2017
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.72.2.0_1777 　
Realization of a perfect skyrmion crystal at zero-field with super-cool process in a chiral-lattice FeGe

Yu Xiuzehn, Morikawa Daisuke, Shibata Kiyo, Kanazawa Naoya, Kagawa Fumitaka, Arima Taka-hisa, Tokura Yoshinori

Meeting Abstracts of the Physical Society of Japan　72　(0)　1652-1652　2017
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.72.2.0_1652 　
Observation of chiral soliton lattice and deformed skyrmion lattice in the strained helimagnet Cu₂OSeO₃

Okamura Yoshihiro

Meeting Abstracts of the Physical Society of Japan　72　(0)　878-878　2017
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.72.2.0_878 　
19aBM-1 Extended metastable skyrmion state and novel lattice structure in bulk samples of Co-Zn-Mn alloy

Karube K., Tokunaga Y., Taguchi Y., Tokura Y., White J.S., Reynolds N., Ronnow H.M., Oike H., Kikkawa A., Kagawa F., Yu X.Z., Morikawa D.

Meeting Abstracts of the Physical Society of Japan　71　(0)　1966-1966　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.1.0_1966 　
19aBM-2 Real-space observations of various lattice forms of skyrmions in Co-Zn-Mn

Yu X.Z., Tokunaga Y., Morikawa D., Karube K., Kikkawa A., Arima T-H., Taguchi Y., Tokura Y.

Meeting Abstracts of the Physical Society of Japan　71　(0)　1967-1967　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.1.0_1967 　
19aBM-4 Correlation of uniaxial anisotropy and type of nanometric magnetic bubbles in layered manganites La_<1.2>Sr_<1.8>(Mn_<1-y>Ru_y)_2O_7

Morikawa D., Yu X. Z., Kaneko Y., Tokunaga Y., Nagai T., Kimoto K., Arima T., Tokura Y.

Meeting Abstracts of the Physical Society of Japan　71　(0)　1969-1969　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.1.0_1969 　
Deformed skyrmions observed in the metastable state with magnetic field cooling in Co₈Zn₈Mn₄ thin plate

Morikawa D., Yu X. Z., Karube K., Kikkawa A., Tokunaga Y., Taguchi Y., Arima T., Tokura Y.

Meeting Abstracts of the Physical Society of Japan　71　(0)　1728-1728　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_1728 　
Current-induced creation of magnetic skyrmion lattice at room temperature

Yu X.Z., Arima T-H., Kawasaki M., Tokura Y., Morikawa D., Tokunaga Y., Kubota M., Oike H., Kurumaji T., Nakamura M., Kagawa F., Taguchi Y.

Meeting Abstracts of the Physical Society of Japan　71　(0)　717-717　2016
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.71.2.0_717 　
17aCG-6 Non-reciprocity of Spin Wave Propagation in B20 Chiral Magnet

Takagi R., Otani Y., Tokura Y., Seki S., Okamura Y., Kondo K., Kanazawa N., Morikawa D., Shibata K., Kikkawa A., Tatara G.

Meeting Abstracts of the Physical Society of Japan　70　(0)　858-858　2015
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.70.2.0_858 　

ISSN： 2189-079X
19aCD-7 Domain structure and chirality reversal with uniaxial stress on chiral-ferroelastic crystal MMoTeO_6

Morikawa D., Tokunaga Y., Taguchi Y., Tokura Y., Arima T.

Meeting Abstracts of the Physical Society of Japan　70　(0)　2069-2069　2015
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.70.2.0_2069 　

ISSN： 2189-079X
17aCH-2 Skyrmion Crystal observed by Resonant Soft X-ray Small-angle Scattering

Yamasaki Y., Morikawa D., Honda T., Nakao H., Murakami Y., Kanazawa N., Kawasaki M., Arima T., Tokura Y.

Meeting Abstracts of the Physical Society of Japan　70　(0)　866-866　2015
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.70.2.0_866 　

ISSN： 2189-079X
16aCD-10 Above-room-temperature formation of magnetic skyrmions in β-Mn-type Co-Zn-Mn alloys

Tokunaga Y., Yu X. Z., White J. S., Ronnow H. M., Morikawa D., Taguchi Y., Tokura Y.

Meeting Abstracts of the Physical Society of Japan　70　(0)　1663-1663　2015
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.70.2.0_1663 　

ISSN： 2189-079X
28pCE-13 Correlation of crystal chirality and skyrmion helicity in B20-type chiral magnets

Morikawa D., Shibata K., Kanazawa N., Yu X. Z., Tokura Y.

Meeting Abstracts of the Physical Society of Japan　69　(0)　632-632　2014
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.69.1.3.0_632_2 　
20pFG-5 Synchrotron radiation X-ray diffraction study on the charge and orbital ordering in A-site-ordered-perovskite-type manganate SmBaMn_2O_6

Sagayama H., Toyoda S., Arima T., Maeda Y., Yamada S., Morikawa D., Tsuda K., Sugimoto K.

Meeting Abstracts of the Physical Society of Japan　67　(0)　544-544　2012
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.67.2.3.0_544_2 　

ISSN： 1342-8349
Structure analysis of charge-orbital ordered phases in A-site ordered SmBaMn2O6 using CBED

Daisuke Morikawa, Kenji Tsuda, Shigeki Yamada, Takahisa Arima

ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES　67　C697-C697　2011

DOI： 10.1107/S0108767311082353 　

ISSN： 2053-2733
27pED-3 Crystal structure analysis of charge and orbital ordered phase of SmBaMn_2O_6 using convergent-beam electron diffraction II

Morikawa D., Tsuda K., Yamada S., Arima T.

Meeting Abstracts of the Physical Society of Japan　66　(0)　634-634　2011
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.66.1.3.0_634_3 　

ISSN： 1342-8349
27pTM-10 Observation of ferroelectric domain walls of hexagonal YMnO_3 using CBED

Tsuda K., Morikawa D., Abe N., Arima T.

Meeting Abstracts of the Physical Society of Japan　66　(0)　984-984　2011
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.66.1.4.0_984_1 　

ISSN： 1342-8349
22aGN-7 Observation of ferroelectric domain walls of hexagonal YMnO_3 using CBED II

Tsuda K., Morikawa D., Abe N., Arima T.

Meeting Abstracts of the Physical Society of Japan　66　(0)　978-978　2011
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.66.2.4.0_978_2 　

ISSN： 1342-8349
22aGN-8 Electrostatic potential analysis of hexagonal YMnO_3 using convergent-beam electron diffraction

Morikawa D., Tsuda K., Abe N., Arima T.

Meeting Abstracts of the Physical Society of Japan　66　(0)　978-978　2011
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.66.2.4.0_978_3 　

ISSN： 1342-8349
23aGA-9 Structural analysis of the room temperature and low temperature phase of NdBaMn_2O_6 using convergent-beam electron diffraction

Morikawa D., Tsuda K., Yamada S., Arima T.

Meeting Abstracts of the Physical Society of Japan　65　(0)　664-664　2010
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.65.1.3.0_664_3 　

ISSN： 1342-8349
23aWJ-11 Crystal structure analysis of charge and orbital ordered phase of SmBaMn_2O_6 using convergent-beam electron diffraction

Morikawa D., Tsuda K., Yamada S., Arima T.

Meeting Abstracts of the Physical Society of Japan　65　(0)　457-457　2010
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.65.2.3.0_457_1 　

ISSN： 1342-8349
25aWY-7 Space group determination of AgNbO_3 at room temperature by CBED method

Sano R., Morikawa D., Tsuda K., Fu D., Itoh M.

Meeting Abstracts of the Physical Society of Japan　65　(0)　916-916　2010
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.65.2.4.0_916_2 　

ISSN： 1342-8349
27aTA-9 Electrostatic potential analysis of the orbital ordered phase of TbMnO_3 using convergent-beam electron diffraction II

Morikawa D., Tsuda K., Ishii F., Abe N., Arima T.

Meeting Abstracts of the Physical Society of Japan　64　(0)　520-520　2009
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.64.1.3.0_520_3 　

ISSN： 1342-8349
26aYK-7 Structural study of the charge and orbital ordered phase of Pr_<0.6>Ca_<0.4>MnO_3 using convergent-beam electron diffraction

Morikawa D., Tsuda K., Yamada S., Arima T.

Meeting Abstracts of the Physical Society of Japan　64　(0)　869-869　2009
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.64.2.4.0_869_1 　

ISSN： 1342-8349
Electrostatic potential analysis of the orbital-ordered phase of spinel oxide FeCr2O4 using CBED

Daisuke Morikawa, Kenji Tsuda, Shintaro Ohtani, Takahisa Arima

ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES　64　C605-C605　2008

DOI： 10.1107/S0108767308080550 　

ISSN： 2053-2733
21aQA-9 Electrostatic potential analysis of the orbital ordered phase of TbMnO_3 using convergent-beam electron diffraction

Morikawa D., Tsuda K., Abe N., Arima T.

Meeting Abstracts of the Physical Society of Japan　63　(0)　483-483　2008
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.63.2.3.0_483_1 　

ISSN： 1342-8349
25pWP-5 Study of the orbital ordered phase of spinel oxide FeCr_2O_4 using convergent-beam electron diffraction II

Morikawa D., Tsuda K., Watanabe Y., Arima T.

Meeting Abstracts of the Physical Society of Japan　63　(0)　618-618　2008
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.63.1.3.0_618_4 　

ISSN： 1342-8349
24aWH-6 Study of the orbital ordered phase of spinel oxide FeCr_2O_4 using convergent-beam electron diffraction I

Morikawa D., Tsuda K.

Meeting Abstracts of the Physical Society of Japan　62　(0)　651-651　2007
Publisher: The Physical Society of Japan
DOI： 10.11316/jpsgaiyo.62.2.3.0_651_4 　

ISSN： 1342-8349

Show all ︎Show first 5

Presentations 91

Crystal Structure and Charge Density Analysis at Twin Boundary using Multiple Convergent-beam Electron Diffraction Patterns

Daisuke Morikawa, Tianyu Liu, Kenji Tsuda

13TH ASIA PACIFIC MICROSCOPY CONGRESS 2025　2025/02/03
収束電子回折法を用いた積層ドメインの解析

森川大輔, Liu Tianyu, 阿部伸行, 有馬孝尚, 津田健治

日本物理学会　2024/09
Local structure analysis of polar domain boundary using convergent-beam electron diffraction Invited

D. Morikawa, K. Tsuda

The 14th Japan-Korea Conference on Ferroelectricity (JKC-FE14)　2024/08
Local Structure Analysis of Polar Domain Boundary and Electric-Field-Response of Polar Nano Domains in BaTiO3 Invited

D. Morikawa, K. Tsuda

The 16th Japan-China Symposium on Ferroelectric Materials and Their Applications (JCFMA-16)　2024/07
六方晶YMnO3の分極ドメイン壁および反位相境界の局所結晶構造解析

森川大輔, Liu Tianyu, 阿部伸行, 有馬孝尚, 津田健治

第41回強誘電体会議　2024/06
収束電子回折法による界面領域の構造解析手法の開発II

森川大輔, Liu Tianyu, 津田健治

日本顕微鏡学会　2024/05
収束電子回折法によるpn接合界面の観察

森川大輔, 齋藤桃子, 佐々木宏和, 津田健治

日本物理学会　2024/03/20
4D-STEM法の界面やその場観察への応用 Invited

森川大輔, 津田健治

2024年新春電子顕微鏡解析技術フォーラム　2024/01
収束電子回折法を用いた局所結晶構造解析の界面への応用

森川大輔, 津田健治

日本結晶学会　2023/10/27
収束電子回折法による界面領域の結晶構造および電子密度分布解析 II

森川大輔, 津田健治

日本物理学会　2023/09/18
Crystal structure and electron density analysis at twin boundaries using convergent-beam electron diffraction

D. Morikawa, Y. Noguchi, K. Tsuda

20th Internati onal Microscopy Congress　2023/09/11
Crystal structure and charge density analysis at interfaces and domain boundaries using convergent-beam electron diffraction

D. Morikawa, Y. Noguchi, K. Tsuda

26TH CONGRESS AND GENERAL ASSEMBLY OF THE INTERNATIONAL UNION OF CRYSTALLOGRAPHY　2023/08/25
Structure analysis of twin domain boundaries using convergent-beam electron diffraction

Daisuke Morikawa, Yuji Noguchi, Kenji Tsuda

International workshop on Advanced and in-situ Microscopies of functional Nanomaterials and devices　2023/06/29
収束電子回折法による界面領域の構造解析手法の開発

森川大輔, 津田健治

日本顕微鏡学会　2023/06/26
Direct observation of polarization distribution at 90-degree domain wall in BaTiO3

The Meeting on Ferroelectric Materials and Their Applications　2023/05/26
収束電子回折法による界面領域の結晶構造および電子密度分布解析

森川大輔, 津田健治

日本物理学会　2023/03
Local structure analysis of interface and polar nano domains using convergent-beam electron diffraction Invited

Daisuke Morikawa, Kenji Tsuda

Third Japan-Canada Microscopy Societies Joint Symposium 2022　2022/11/05
STEM-CBED法による分極ナノドメインの電場応答その場観察 Invited

森川大輔, 津田健治

その場観察分科会2022年研究討論会　2022/11
収束電子回折法による強誘電体ドメイン壁の微細構造解析

森川大輔, 野口祐二, 津田健治

日本結晶学会　2022/11
強誘電体ドメイン壁における収束電子回折図形の対称性変化と微細構造解析II

森川大輔, 野口祐二, 津田健治

日本物理学会　2022/09/14
収束電子回折法を用いた局所構造解析手法の開発と界面やその場観察への応用

森川大輔

日本顕微鏡学会　2022/05/12
Charge-orbital ordering in A-site ordered NdBaMn2O6 perovskite

M. S. Islam, D. Morikawa, K. Tsuda, S. Yamada, M. Terauchi

APS March Meeting 2022　2022/03/17
Interplay between magnetic frustration, magnetocrystalline anisotropy and Dzyaloshinskii-Moriya interaction in chiral Co-Zn-Mn alloys

Victor Ukleev, Kosuke Karube, Peter M Derlet, Chennan Wang, Hubertus Luetkens, Daisuke Morikawa, Akiko Kikkawa, Lucile Mangin-Thro, Andrew R Wildes, Yuichi Yamasaki, Yuichi Yokoyama, Yu Le, Cinthia Piamontese, Nicolas Jaouen, Yusuke Tokunaga, Henrik M Ronnow, Taka-hisa Arima, Yoshinori Tokura, Jonathan S White, Yasujiro Taguchi

APS March Meeting 2022　2022/03/16
強誘電体ドメイン壁における収束電子回折図形の対称性変化と微細構造解析

森川大輔, 野口祐二, 津田健治

日本物理学会　2022/03/16
収束電子回折法による局所構造解析の界面やその場観察への応用

森川大輔

日本物理学会　2022/03/05
収束電子回折法によるBaTiO3分極ナノドメインの電場応答その場観察

森川大輔, 津田健治

日本結晶学会　2021/11/19
収束電子回折法によるBaTiO3ナノドメインの電場印可その場観察II

森川大輔, 津田健治

日本物理学会　2021/09/23
STEM-CBED法によるBaTiO3分極ナノドメインの電場印可その場観察

森川大輔, 津田健治

日本顕微鏡学会　2021/06
Improvement of accuracy and precision in refinement of crystal structure factors using zone-axis incidence and tilted CBED patterns

B. Aryal, D. Morikawa, K. Tsuda, M. Terauchi

APS March Meeting 2021　2021/03/19
収束電子回折法によるBaTiO3ナノドメインの電場印可その場観察

森川大輔, 津田健治

日本物理学会　2021/03/13
収束電子回折法を用いたCaTiO3双晶境界における分極構造の解析

森川大輔, 津田健治

日本結晶学会　2020/11
A Study on Occupation Sites in M6C Carbide in High Chromium Cast Iron Using Statistical Beam-Rocking TEM-EDS Analysis

S. Nusen, A. Wiengmoon, D. Morikawa, N. Azumi, T. Chairuangsri, K. Tsuda, M. Terauchi

6th Forum of Center for Advanced Materials Research and International Collaboration　2020/10
LACBED 図形の動力学シミュレーションへの機械学習の応用

津田健治, 森川大輔, 越川亜美, 大関真之

日本物理学会　2020/09
Improvement in the precision of refinement of the crystal structure factors using convergent-beam electron diffraction

B. Aryal, D. Morikawa, K. Tsuda, M. Terauchi

2020/09
STEM-CBED法によるCaTiO3の界面誘起分極構造の観察

森川大輔, 津田健治

日本物理学会　2020/09
磁気渦の電流駆動の直接観察

于秀珍, 森川大輔, 中島清美, 柴田基洋, 金澤直也, 有馬孝尚, 永長直人, 十倉好紀

日本顕微鏡学会　2020/05
収束電子回折法を用いた試料ダメージ層の定量評価 II

上石正樹, 森川大輔, 佐藤香織, 津田健治, 寺内正己

日本顕微鏡学会　2020/05
STEM-CBED法によるCaTiO3における極性ドメイン境界の観察

森川大輔, 津田健治

日本顕微鏡学会　2020/05
大角度ロッキングCBED図形を用いた結晶構造因子決定精度の検証II

森川大輔, 津田健治

日本物理学会　2020/03
Topological properties of β-Mn-type room-temperature skyrmion materials

K. Karube, J. S. White, D. Morikawa, X. Z. Yu, K. Shibata, T. Koretsune, C. D. Dewhurst, R. Cubitt, N. Reynolds, J. L. Gavilano, M. Bartkowiak, A. Kikkawa, H. Oike, F. Kagawa, Y. Tokunaga, R. Arita, T. Arima, H. M. Rønnow, Y. Tokura, Y. Taguchi

2019/11
Synthesis, Crystal Structure and Properties of Lithium-Ion conducting LiTa2PO8

Norikazu ISHIGAKI, Kunimitsu KATAOKA, Daisuke MORIKAWA, Masami TERAUCHI, Kikuko HAYAMIZU, Junji AKIMOTO

The 36th International Japan-Korea Seminar on Ceramics　2019/11
Analysis and accuracy evaluation on orbital-ordered phase using large angle rocking CBED pattern

2019/11
Extended skyrmion states in high-temperature chiral magnets

K. Karube, J. S. White, D. Morikawa, X. Z. Yu, H. Oike, A. Kikkawa, N. Reynolds, J. L. Gavilano, M. Bartkowiak, C. D. Dewhurst, R. Cubitt, F. Kagawa, Y. Tokunaga, T. Arima, H. M. Rønnow, Y. Tokura, Y. Taguchi

International Conference on Strongly Correlated Electron Systems (SCES) 2019　2019/09
Accurate determination of low-order crystal structure factors using large-angle rocking CBED patterns International-presentation

Daisuke Morikawa, Kenji Tsuda

Microscopy Conference 2019　2019/09
大角度ロッキングCBED図形を用いた結晶構造因子決定精度の検証

森川大輔, 津田健治

日本物理学会　2019/09
収束電子回折法を用いた試料ダメージ層の定量評価

上石正樹, 森川大輔, 佐藤香織, 津田健治, 寺内正己

日本顕微鏡学会　2019/06
大角度ロッキングCBED図形を用いた軌道整列状態の静電ポテンシャル分布解析

森川大輔, 津田健治

日本顕微鏡学会　2019/06
大角度ロッキングCBED図形を用いた結晶構造因子精密化

森川大輔, 津田健治

日本物理学会　2019/03
Lorentz TEM observation of deformed skyrmions in supercooled state International-presentation

D. Morikawa, X.Z. Yu, K. Karube, Y. Tokunaga, Y. Taguchi, T. Arima, Y. Tokura

19th International Microscopy Congress　2018/09
Robust magnetic-field-free skyrmions above room temperature in a bulk chiral magnet

K. Karube, J. S. White, M. Bartkowiak, D. Morikawa, X. Z. Yu, A. Kikkawa, Y. Tokunaga, T. Arima, H. M. Rønnow, Y. Tokura, Y. Taguchi

SPIE Optics & Photonics Conference　2018/08
Electrical magnetochiral effect induced by chiral spin fluctuations in MnSi

T. Yokouchi, N. Kanazawa, A. Kikkawa, D. Morikawa, K. Shibata, T. Arima, Y. Taguchi, F. Kagawa, Y. Tokura

APS March Meeting　2018/03
Cu₂OSeO₃における一軸応力によるカイラルソリトン格子の発現とスキルミオン格子の変形

岡村嘉大, 山崎裕一, 山崎裕一, 森川大輔, 本田孝志, UKLEEV Victor, 中尾裕則, 村上洋一, 柴田基洋, 賀川史敬, 関真一郎, 有馬孝尚, 有馬孝尚, 十倉好紀, 十倉好紀

日本物理学会講演概要集(CD-ROM)　2017/09/25
軟X線小角散乱を用いたマルチフェロイックCu₂OSeO₃における電場誘起スキルミオンらせん磁性転移の観測

岡村嘉大, 山崎裕一, 山崎裕一, 森川大輔, 本田孝志, 中尾裕則, 村上洋一, 関真一郎, 賀川史敬, 有馬孝尚, 有馬孝尚, 十倉好紀, 十倉好紀

KEK Progress Report (Web)　2017/01
磁場下冷却による準安定状態として観察されたCo8Zn8Mn4薄片でのスキルミオン変形

森川大輔, 于秀珍, 軽部皓介, 吉川明子, 徳永祐介, 田口康二郎, 有馬孝尚, 十倉好紀

日本物理学会　2016/09
MnSi薄膜 / Si(111)の結晶カイラリティ決定

森川大輔, 有馬孝尚, 金澤直也, 横内智行, 十倉好紀

日本顕微鏡学会　2016/06
共鳴軟X線小角散乱を用いたマルチフェロイクスCu₂OSeO₃におけるスキルミオンダイナミクスの観測

岡村嘉大, 山崎裕一, 山崎裕一, 森川大輔, 本田孝志, 中尾裕則, 村上洋一, 関真一郎, 賀川史敬, 有馬孝尚, 有馬孝尚, 十倉好紀, 十倉好紀

日本放射光学会年会・放射光科学合同シンポジウム予稿集　2016/01/09
共鳴軟X線小角散乱によるB20型構造FeGeにおけるスキルミオン格子の観測

山崎裕一, 山崎裕一, 森川大輔, 本田孝志, 中尾裕則, 村上洋一, 金澤直也, 川崎雅司, 川崎雅司, 有馬孝尚, 有馬孝尚, 十倉好紀, 十倉好紀

日本放射光学会年会・放射光科学合同シンポジウム予稿集　2016/01/09
19aBM-4 Correlation of uniaxial anisotropy and type of nanometric magnetic bubbles in layered manganites La_<1.2>Sr_<1.8>(Mn_<1-y>Ru_y)_2O_7

Morikawa D., Yu X. Z., Kaneko Y., Tokunaga Y., Nagai T., Kimoto K., Arima T., Tokura Y.

Meeting Abstracts of the Physical Society of Japan　2016
19aBM-2 Real-space observations of various lattice forms of skyrmions in Co-Zn-Mn

Yu X.Z., Tokunaga Y., Morikawa D., Karube K., Kikkawa A., Arima T-H., Taguchi Y., Tokura Y.

Meeting Abstracts of the Physical Society of Japan　2016
19aBM-1 Extended metastable skyrmion state and novel lattice structure in bulk samples of Co-Zn-Mn alloy

Karube K., Tokunaga Y., Taguchi Y., Tokura Y., White J.S., Reynolds N., Ronnow H.M., Oike H., Kikkawa A., Kagawa F., Yu X.Z., Morikawa D.

Meeting Abstracts of the Physical Society of Japan　2016
共鳴軟X線小角散乱による磁気スキルミオン格子の観測

山崎裕一, 山崎裕一, 森川大輔, 本田孝志, 中尾裕則, 村上洋一, 金澤直也, 川崎雅司, 川崎雅司, 有馬孝尚, 有馬孝尚, 十倉好紀, 十倉好紀

日本物理学会講演概要集(CD-ROM)　2015/09/24
カイラル強弾性体MMoTeO6のドメイン構造と応力印加カイラリティ反転

森川大輔, 徳永祐介, 田口康二郎, 十倉好紀, 有馬孝尚

日本物理学会　2015/09
Chiral domain structure and chirality reversal by uniaxial stress on ferroelastic chiral crystal International-presentation

D. Morikawa, Y. Tokunaga, Y. Taguchi, Y. Tokura, T. Arima

NIMS conference 2015　2015/07
カイラル強弾性結晶におけるドメイン構造の解明と応力印加カイラリティ反転の観察

森川大輔, 徳永祐介, 田口康二郎, 十倉好紀, 有馬孝尚

日本顕微鏡学会　2015/05
共鳴軟X線小角散乱による磁気スキルミオン格子の観測

山崎裕一, 森川大輔, 本田孝志, 中尾裕則, 岡本淳, 須田山貴亮, 村上洋一, 金澤直也, 川崎雅司, 有馬孝尚, 十倉好紀

物構研サイエンスフェスタ要旨集　2015
Lorentz TEM study on nanometric magnetic bubbles in Ru-doped bilayered manganites International-presentation

D. Morikawa, X.Z. Yu, Y. Kaneko, Y. Tokunaga, T. Nagai, K. Kimoto, T. Arima, Y. Tokura

18th International Microscopy Congress　2014/09
ローレンツTEM法による層状Mn酸化物のナノオーダー磁気バブルの観察

森川大輔, 于秀珍, 金子良夫, 徳永祐介, 長井拓郎, 木本浩司, 有馬孝尚, 十倉好紀

日本顕微鏡学会　2014/05
B20型磁性体の結晶カイラリティとスキルミオンヘリシティの相関

森川大輔, 柴田基洋, 金澤直也, 于秀珍, 十倉好紀

日本物理学会　2014/03
28pCE-13 Correlation of crystal chirality and skyrmion helicity in B20-type chiral magnets

Morikawa D., Shibata K., Kanazawa N., Yu X. Z., Tokura Y.

Meeting Abstracts of the Physical Society of Japan　2014
B20型構造の結晶カイラリティとスキルミオンヘリシティの相関

森川大輔, 柴田基洋, 金澤直也, 于秀珍, 十倉好紀

日本顕微鏡学会　2013/05
20pFG-5 Synchrotron radiation X-ray diffraction study on the charge and orbital ordering in A-site-ordered-perovskite-type manganate SmBaMn_2O_6

Sagayama H, Toyoda S, Arima T, Maeda Y, Yamada S, Morikawa D, Tsuda K, Sugimoto K

Meeting Abstracts of the Physical Society of Japan　2012
収束電子回折法による六方晶YMnO3強誘電相の静電ポテンシャル分布解析

森川大輔, 津田健治, 阿部伸行, 有馬孝尚

日本物理学会　2011/09
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)　2011/08/16
Structure analysis of charge-orbital ordered phases in A-site ordered SmBaMn2O6 using CBED International-presentation

Daisuke Morikawa, Kenji Tsuda, Shigeki Yamada, Takahisa Arima

XXII Congress of the International Union of Crystallography　2011/08
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)　2011/03/09
収束電子回折法によるSmBaMn2O6電荷軌道秩序相の結晶構造解析II

森川大輔, 津田健治, 山田重樹, 有馬孝尚

日本物理学会　2011/03
収束電子回折法によるAサイト秩序型ペロブスカイト型酸化物SmBaMn2O6電荷軌道秩序相の結晶構造解析

森川大輔, 津田健治, 山田重樹, 有馬孝尚

日本結晶学会　2010/12
Structure analysis of charge-orbital ordered phases in A-site ordered perovskites SmBaMn2O6 and NdBaMn2O6 using CBED International-presentation

Daisuke Morikawa, Kenji Tsuda, Shigeki Yamada, Takahisa Arima

The 10th Conference of the Asian Crystallographic Association　2010/10
収束電子回折法によるSmBaMn2O6電荷軌道秩序相の結晶構造解析

森川大輔, 津田健治, 山田重樹, 有馬孝尚

日本物理学会　2010/09
収束電子回折法によるNdBaMn2O6室温相および低温相の結晶構造解析

森川大輔, 津田健治, 山田重樹, 有馬孝尚

日本物理学会　2010/03
収束電子回折法によるホランダイト型酸化物 K2Cr8O16低温相の構造の研究

森川大輔, 津田健治, 長谷川邦洋, 上田寛

日本結晶学会　2009/12
Visualization of the orbital-ordered state of FeCr2O4 using the CBED method International-presentation

Daisuke Morikawa, Kenji Tsuda, Shintaro Ohtani, Takahisa Arima

Joint Conference of the Asian Crystallographic Association and Chinese Crystallography Society　2009/10
収束電子回折法によるPr0.6Ca0.4MnO3電荷軌道秩序相の解析

森川大輔, 津田健治, 山田重樹, 有馬孝尚

日本物理学会　2009/09
The Electrostatic potential and electron density analysis of the orbital-ordered state of TbMnO3 using CBED International-presentation

Daisuke Morikawa, Kenji Tsuda, Fumiyuki Ishii, Nobuyuki Abe, Takahisa Arima

The Twelfth Frontiers of Electron Microscopy in Materials Science　2009/09
収束電子回折法による遷移金属酸化物軌道秩序相の静電ポテンシャル分布解析

森川大輔, 津田健治, 石井史之, 大谷晋太郎, 阿部伸行, 有馬孝尚

日本顕微鏡学会　2009/05
収束電子回折法によるTbMnO3軌道秩序相の静電ポテンシャル分布解析II

森川大輔, 津田健治, 石井史之, 阿部伸行, 有馬孝尚

日本物理学会　2009/03
収束電子回折法によるTbMnO3軌道秩序相の静電ポテンシャル分布解析

森川大輔, 津田健治, 阿部伸行, 有馬孝尚

日本物理学会　2008/09
Electrostatic potential analysis of the orbital-ordered phase of spinel oxide FeCr2O4 using CBED International-presentation

Daisuke Morikawa, Kenji Tsuda, Shintaro Ohtani, Takahisa Arima

XXI Congress of the International Union of Crystallography　2008/08
収束電子回折法によるスピネル酸化物FeCr2O4の軌道秩序状態の研究II

森川大輔, 津田健治, 渡邉洋介, 大谷晋太郎, 有馬孝尚

日本物理学会　2008/03
収束電子回折法によるスピネル酸化物FeCr2O4の軌道秩序状態の研究

森川大輔, 津田健治, 渡邉洋介, 有馬孝尚

日本結晶学会　2007/12
収束電子回折法によるスピネル酸化物FeCr2O4の軌道秩序状態の研究I

森川大輔, 津田健治

日本物理学会　2007/09

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Research Projects 9

Innovation of drug discovery through visualization of structures beyond atomic coordinates

Kenji TSUDA, Yohei SATO, Daisuke MORIKAWA, Liu Tianyu

Offer Organization: Japan Science and Technology Agency (JST)

System: JST-MIRAI program

Category: "Common Platform Technology, Facilities, and Equipment" mission area: Full-scale R&D Project

Institution: Tohoku University

2023/04 - 2028/03
ナノ電子プローブによる界面の電子密度分布解析の実現

森川大輔

Offer Organization: 山田科学振興財団

System: 山田科学振興財団2024年度研究援助

2024/10 - 2026/03
Development of local electron density and physical property analysis method for two dimensional structure

Daisuke Morikawa

Offer Organization: Japan Science and Technology Agency (JST)

System: PRESTO

2022/10 - 2026/03
Direct observation of polarization rotation at ferroelectric domain boundary using nano-scale charge density analysis

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)

Institution: Tohoku University

2022/04/01 - 2024/03/31
ナノ電子プローブを用いたドメイン境界の静電ポテンシャル分布解析

森川大輔

Offer Organization: 三菱財団

System: 自然科学研究助成（若手）

2021/10 - 2022/09
ナノ電子プローブを用いたその場観察による強誘電体ナノドメインの電場応答の解明

森川大輔

Offer Organization: 村田学術振興財団

System: 研究助成

2021/07 - 2022/06
ナノ電子プローブを用いた電子密度分布解析による機能コアの電場応答解明

森川大輔

Offer Organization: 日本学術振興会

System: 科学研究費助成事業新学術領域研究(研究領域提案型)

Category: 新学術領域研究(研究領域提案型)

Institution: 東北大学

2020/04/01 - 2022/03/31

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本研究では、ナノ電子プローブを用いた収束電子回折法により、界面やドメイン境界等の機能コアにおける結晶構造解析および電子密度分布解析を目指した。これまでに電場印加その場観察実験に不可欠な集束イオンビーム加工によるTEM試料作製のための条件構築や、そのTEM試料の品質の定量評価を行った。また、機能コアの例として、界面誘起による分極構造の発現を、ナノメータスケールの微小領域の解析から明らかにした。広く応用されている強誘電体であるBaTiO3において，近年最低温相の菱面体構造が室温以上まで存在していることが報告された．本研究では，上述の技術を用い、分極ナノドメインの電場応答を明らかにすることに成功した．メゾスコピックな分極ドメインの反転に加えて，ナノドメイン分布の変化によると考えられる応答が観察されており，電場印加下においても不均一が存在していることが明らかになった。また、実験を再現しうるモデルとして、菱面体晶の分極ナノドメインの分布が、電場印加によって偏りを生じているモデルを提案し、実験をよく再現することに成功した。また、局所領域の電子密度分布解析の高精度化のための指針を示した。解析において晶帯軸入射のデータを用いた場合と、特定の反射を励起した傾斜条件のデータを用いた場合の解析の差異を明らかにし、パラメータ精密化における精度と、パラメータ変化に対する感度の関係性を初めて明らかにした。
Investigation of interface induced polarization using electron nano-probe

Morikawa Daisuke

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Early-Career Scientists

Category: Grant-in-Aid for Early-Career Scientists

Institution: Tohoku University

2019/04/01 - 2021/03/31

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Improvement of electron density distribution analysis by convergent-beam electron diffraction using a nano-electron probe was conducted. Diffraction patterns with large convergence angle have advantage for precise determination of electron density and the origin was discussed. Crystal zone axis incidence and the data obtained from slight beam tilting condition were used for structural refinement and the difference were investigated. The twin interface of CaTiO3 was analyzed as an interface-induced polarization structure. From the symmetry change of the convergent-beam electron diffraction pattern at each electron probe position, the breaking of centrosymmetric at the interface was found.
Site-selective analysis of local structure and electronic states of ferroelectrics using electron spectroscopic multi-probes

Tsuda Kenji

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory)

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: Tohoku University

2018/06/29 - 2020/03/31

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Electron incoherent channeling techniques based on the combined use of electron spectroscopy and electron channeling effect, have been applied to local structure analysis of dopant atom sites in BaTiO3 ferroelectrics. Off-centering of dopant Ca atoms at Ba sites was revealed from characteristic X-ray incoherent channeling patterns obtained from a single ferroelectric domain area for the first time.

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