Nobel type of electromagnetic effect caused by hidden current induced magnetization in zigzag antiferromagnetic metals

2021 Fiscal Year Final Research Report

• Project/Area Number: 19K03736
• 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: Tohoku University
• Principal Investigator: Kimata Motoi 東北大学, 金属材料研究所, 准教授 (20462517)
• Project Period (FY): 2019-04-01 – 2022-03-31
• Keywords: 電気磁気効果 / 非相反磁気抵抗 / 反強磁性スピントロニクス

Outline of Final Research Achievements

In this study, we are aiming to expand the applicable region of electro-magnetic effects into magnetic conductors beyond the conventional magnetic insulators. The main target materials are time and spatially inversion-symmetry-broken conducting systems. We have mainly obtained following results. Firstly, we have revealed thermally assisted domain reversal mechanism in a oxide antiferromagnetic thin film. Secondly, we have succeeded to detect time-reversal-symmetry breaking associated with triangle antiferromagnetic structure. Thirdly, we have found the magnetic field induced spin polarized state in a chiral semiconductor.

Free Research Field

強磁場物性物理学

Academic Significance and Societal Importance of the Research Achievements

本研究で達成した成果は、主に反強磁性磁気状態の制御や検出に関わるものである。スピンが互いに打ち消し合う反強磁性は正味の磁化を持たないため、磁気状態の検出や制御が従来困難であると考えられてきた。本研究はこれらの困難を克服する実験手法を提案、実証するものであり大きな学術的意義を有する。従って、今後さまざまな反強磁性体を用いたスピントロニクスや熱電変換など、新たな物質機能の開拓に対して貢献が期待できる。