Origin of strong magnetic anisotropy in L10-FeNi probed by angular-dependent magnetic circular dichroism

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:326

Letter

Kotsugi, Masato^1,3  Mizuguchi, Masaki^2,3  Sekiya, Shigeki²  Mizumaki, Masaichiro¹  Kojima, Takayuki^2,3  Nakamura, Tetsuya¹  Osawa, Hitoshi¹  Kodama, Kenji¹  Ohtsuki, Takumi^1,3  Ohkochi, Takuo^1,3  Takanashi, Koki^2,3  Watanabe, Yoshio¹ 

[1] SPring 8 JASRI, Sayo, Hyogo 6795198, Japan

[2] Tohoku Univ, Aoba Ku, Sendai, Miyagi 9808577, Japan

[3] Japan Sci & Technol Agcy JST, Chiyoda Ku, Tokyo 1020076, Japan

关键词: Magnetic anisotropy;    Spin-orbit interaction;    Magnetic circular dichroism;    L1(0)-FeNi;    Iron meteorite;   

DOI  :  10.1016/j.jmmm.2012.09.008

来源: Elsevier

【 摘 要 】

We investigated the origin of strong magnetic anisotropy energy (MAE) in L1(0)-type ordered FeNi phase by angular-dependent magnetic circular dichroism. Our findings showed that the orbital magnetic moment of Fe has a significant angular dependence that exhibits a maximum value at the [001] direction corresponding perpendicular to the plane. The calculated uniaxial anisotropy energy when considering spin-orbit (SO) interaction shows quantitatively good agreement with the volume MAE. We concluded that the orbital anisotropy in 3d Fe electrons results in the strong MAE in L1(0)-FeNi and ascribe this to the spin-orbit interaction via structural ordering. (C) 2012 Elsevier BY. All rights reserved.

【 授权许可】

Free