Tb－Coアモルファス薄膜の４つの磁気補償点の発見～磁性体の応用に新しい視点～

2025-06-10 群馬大学

図　Tb_xCo_100-xアモルファス薄膜の4つの磁気補償点の組成比依存性。

＜関連情報＞

• https://www.gunma-u.ac.jp/information/205349
• https://www.sciencedirect.com/science/article/abs/pii/S0304885325004809?via%3Dihub

TbxCo100-xアモルファス薄膜における4つの補償点 Four compensation points in TbxCo100-x amorphous films

Akane Agui, Akino Harako, Naruki Tsuji Xiaoxi Liu, Kazushi Hoshi, Kosuke Suzuki, Manabu Takahashi, Hiroshi Sakurai
Journal of Magnetism and Magnetic Materials  Available online: 2 June 2025
DOI:https://doi.org/10.1016/j.jmmm.2025.173248

Highlights

• The temperature and composition dependencies of the magnetic moment in Tb_xCo_100-x was measured.
• Spin magnetic moment was evaluated using Magnetic Compton scattering.
• It was found spin magnetic compensation occurs with the total magnetization remains nonzero.
• A similar compensation was observed for the orbital magnetic moment.
• It was found the existence of at least four compensation points.

Abstract

We investigated the temperature and composition dependencies of the magnetic moment in Tb_xCo_100-x using magnetic Compton scattering and SQUID measurements. We discovered new magnetic compensation points where spin magnetic compensation occurs with zero net spin magnetization, though the total magnetization remains nonzero. A similar compensation was observed for the orbital magnetic moment. This is the first report to document the existence of at least four compensation points—magnetic, angular momentum, spin, and orbital—in ferrimagnetic films and to describe the relationship between them. These compensation points are expected to be key parameters in spintronics technologies, particularly for the design of perpendicular magnetic anisotropy, spin polarization, topological properties, and high-speed magnetic response techniques.