Interaction effects in spintronics

2023 Fiscal Year Final Research Report

• Project/Area Number: 19K03744
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
• Research Institution: Nagoya University
• Principal Investigator: Hiroshi Kohno 名古屋大学, 理学研究科, 教授 (10234709)
• Project Period (FY): 2019-04-01 – 2024-03-31
• Keywords: スピントロニクス / トポロジカルホール効果 / ジャロシンスキー・守谷相互作用 / 動的格子変形 / マグノン・ドラッグ効果 / スピン起電力 / スピントルク / 反強磁性体

Outline of Final Research Achievements

(1) Microscopic calculations have been performed on the topological Hall effect, topological spin Hall effect, and spin-motive forces for collinear and/or canted antiferromagnets, where the Berry phase picture (which assumes adiabatic process) breaks down and non-adiabatic processes become important. The emergent electromagnetic (or spin-motive) field and emergent spin vector potential in antiferromagnets have been identified. (2) Microscopic calculations of spin-transfer torque in antiferromagnets have been performed. (3) Magnon-drag processes in the presence of topological spin structure have been studied. (4) Microscopic theory of Dzyaloshinskii-Moriya interaction mediated by band electrons with strong spin-orbit interaction have been developed. (5) Effects of spin-orbit interaction on mechanical spin-current generation have been investigated microscopically starting from a multi-orbital tight-binding model.

Free Research Field

スピントロニクス

Academic Significance and Societal Importance of the Research Achievements

スピントロニクスの基礎理論を、強磁性体から反強磁性体へ、電気的摂動から力学的摂動へ、一様磁化下のマグノンドラッグから磁化構造下のマグノンドラッグへ、といった方向へ進展させた。また、ジャロシンスキー・守谷相互作用の微視的理論を構築した。