Active control of magnetic anisotropy in ultrathin antiferromagnetic films

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K05302
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 29010:Applied physical properties-related
• Research Institution: Nagoya Institute of Technology
• Principal Investigator: Mibu Ko 名古屋工業大学, 工学(系)研究科(研究院), 教授 (40222327)
• Co-Investigator(Kenkyū-buntansha): 田中 雅章 名古屋工業大学, 工学(系)研究科(研究院), 准教授 (50508405)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 反強磁性体 / 超薄膜 / 磁気異方性 / スピントロニクス / メスバウアー分光

Outline of Final Research Achievements

Methods to control the magnetic anisotropy (the directions of atomic magnetic moments) of antiferromagnetic films, statically and dynamically, were investigated to make antiferromagnets, where the magnetic moments of the constituent atoms are canceled out, more active and fascinating magnetic materials. It was tried, mainly for hematite, a typical antiferromagnet, to control the magnetic anisotropy through static modulations, such as doping of hetero-elements, control of the thickness, application of epitaxial strains, and dynamical modulations, such as electric voltage applications. Systematic data on the static modulations were accumulated, and data which suggest the change in magnetic anisotropy through the voltage applications were obtained for layered films with a lithium-containing compound.

Free Research Field

磁性薄膜

Academic Significance and Societal Importance of the Research Achievements

外部に磁束を出さないため実用磁性材料の主役にはならないと考えられてきた反強磁性体の薄膜において，磁気異方性の静的制御法を確立するとともに，新たな動的制御方法を提示し，反強磁性体を能動的な実用材料として利用する上でひとつの有望な選択肢を拓いた。