| Project/Area Number |
20K15155
|
|---|
| Research Category |
Grant-in-Aid for Early-Career Scientists
|
| Allocation Type | Multi-year Fund |
|---|
| Review Section |
Basic Section 29010:Applied physical properties-related
|
|---|
| Research Institution | Tohoku University |
|---|
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)
|
|---|
| Project Period (FY) |
2020-04-01 – 2023-03-31
|
| Project Status |
Discontinued (Fiscal Year 2021)
|
| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
|
|---|
| Keywords | Antiferromagnet / Topology / Weyl semimetal / AFM Spintronics / AFM spintronics / Weyl semimetals / Band structure topology / Non collinear |
|---|
| Outline of Research at the Start |
The realization of high-speed and low-power architectures is a crucial challenge for high-throughput computing paradigms. This project aims at control and manipulation of topological non-collinear antiferromagnet by charge or spin currents for ultra-fast, dissipation-less spintronic devices.
|
| 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.
|
| 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.
|
| 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.
|
