2021 Fiscal Year Research-status Report
Current-driven dynamics of non-collinear antiferromagnetic spin structures for functional spintronic devices
| Project/Area Number |
20K15155
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| Research Institution | Tohoku University |
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Principal Investigator |
DUTTAGUPTA SAMIK 東北大学, 先端スピントロニクス研究開発センター, 助教 (30807657)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | Antiferromagnet / Topology / Weyl semimetal / AFM Spintronics |
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| Outline of Annual Research Achievements |
The concerted effort of relativistic spin-orbit interaction, electronic band topology and magnetic order in antiferromagnetic Weyl semimetals (WSM-AFMs) manifests itself in novel properties, crucial for development of antiferromagnetic spintronics. We quantified magnetotransport properties of polycrystalline and epitaxial WSM-AFM/heavy-metal structures which revealed signatures of chiral anomaly in condensed matter systems. We utilized anomalous Nernst effect for different crystallographic orientations (C and M-plane) of the epitaxial structure. Our observations show an electronic route towards characterization of topological nature of electronic bands in Weyl semimetals.
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| Current Status of Research Progress |
Current Status of Research Progress
1: Research has progressed more than it was originally planned.
Reason
Our current research work deals with the interplay of relativistic spin-orbit interaction and non-collinear antiferromagnetic order leading to novel spin-dependent topological magnetoresistive effects and corresponds to the first objective of the proposed work plan. Our present experimental results supported by theoretical models have provided significant insights into the quantification of the band structure topology along different crystallographic axes, antiferromagnet and heavy-metal (HM) underlayer thickness in antiferromagnetic Weyl semimetal/HM structures. Currently, we are investigating new routes towards control of the topological properties for the realization of high-performance antiferromagnetic spintronic devices.
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| Strategy for Future Research Activity |
The proposed work can be divided into three stages: (1) quantification and control of the topological properties in non-collinear Weyl semimetal antiferromagnet (WSM-AFM), (2) current-induced control of WSM-AFM spin structures, and (3) realization and current-induced control of WSM-AFM spin textures. At this stage, our results enable electronic quantification of the topological properties in an antiferromagnet Weyl semimetal heterostructure. Subsequent investigations concern current-induced control of WSM-AFM spin structures for development of next-generation antiferromagnetic spintronic devices.
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| Causes of Carryover |
The proposed grant amount was originally planned for the purchase of sputtering targets, single crystalline substrates, and process gas for experiments. However, in the last year, we have been able to achieve our proposed objective in a significantly quick time scale as originally planned. The incurring amount will be utilized this FY for purchase of experimental items (sample fabrication, and electronic measurements).
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[Journal Article] Observation of domain structure in non-collinear antiferromagnetic Mn3Sn thin films by magneto-optical Kerr effect2022
Author(s)
Tomohiro Uchimura, Ju-Young Yoon, Yuma Sato, Yutaro Takeuchi, Shun Kanai, Ryota Takechi, Keisuke Kishi, Yuta Yamane, Samik DuttaGupta, Jun’ichi Ieda, Hideo Ohno, and Shunsuke Fukami
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Journal Title
Applied Physics Letters (accepted)
Volume: 4
Pages: -
Peer Reviewed / Int'l Joint Research
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[Presentation] Dynamics of synthetic antiferromagnetic skyrmion from current-induced deterministic motion to thermally-activated diffusive motion2021
Author(s)
T. Dohi, S. DuttaGupta, F. Kammerbauer, N. Kerber, B. Seng, Y. Ge, K. Raab, R. Gruber, M. Brems, J. Rothorl, P. Virnau, S. Fukami, M. Klaui and H. Ohno
Organizer
InterMag 2021
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