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arXiv 1706.08183cond-mat.mtrl-sci
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Fe和Pt $L_{2,3}$ -棱X射线磁圆二色性研究$L1_0$有序FePt薄膜的磁各向异性

Magnetic anisotropy of $L1_0$-ordered FePt thin films studied by Fe and Pt $L_{2,3}$-edges x-ray magnetic circular dichroism

K. Ikeda, T. Seki, G. Shibata, T. Kadono, K. Ishigami, Y. Takahashi, M. Horio, S. Sakamoto, Y. Nonaka, M. Sakamaki, K. Amemiya, N. Kawamura, M. Suzuki, K. Takanashi, A. Fujimori

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9 pages, 4 figures, 2 tables
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摘要：

$L{\rm1_0}$有序FePt的强垂直磁各向异性一直是长期以来广泛研究的主题。然而，它是不知道的元素，铁或铂，主要有助于磁各向异性能（MAE）。用Fe和Pt $L_{2,3}$边X射线磁性圆二色性（XMCD）方法研究了不同$S$长程化学有序度的样品的FePt薄膜中Fe 3 $d$和Pt 5 $d$电子轨道磁矩的各向异性. Fe $L_{2,3}$ -edge XMCD表明，当磁场垂直于膜施加时，轨道磁矩大于平行于膜施加时，并且轨道磁矩的各向异性随着$S$而增加。Pt $L_{2,3}$ -边缘XMCD还表明，当磁场垂直于膜施加时，轨道磁矩小于平行于膜施加时，与Fe $L_{2,3}$ -边缘XMCD结果相反，尽管轨道磁矩的各向异性随着$S$而增加，如Fe边缘。这些结果与Solovyev ${\it et\ al.}$ [Phys. Rev. $\bf{52}$，13419（1995）.]的第一性原理计算定性一致，由于$L{\rm1_0}$有序FePt中Pt 5 $d$带的自旋劈裂小，自旋轨道耦合强，Pt 5 $d$对磁各向异性能的贡献大于Fe 3 $d$.

英文摘要：

The strong perpendicular magnetic anisotropy of $L{\rm1_0}$-ordered FePt has been the subject of extensive studies for a long time. However, it is not known which element, Fe or Pt, mainly contributes to the magnetic anisotropy energy (MAE). We have investigated the anisotropy of the orbital magnetic moments of Fe 3$d$ and Pt 5$d$ electrons in $L{\rm1_0}$-ordered FePt thin films by Fe and Pt $L_{2,3}$-edge x-ray magnetic circular dichroism (XMCD) measurements for samples with various degrees of long-range chemical order $S$. Fe $L_{2,3}$-edge XMCD showed that the orbital magnetic moment was larger when the magnetic field was applied perpendicular to the film than parallel to it, and that the anisotropy of the orbital magnetic moment increased with $S$. Pt $L_{2,3}$-edge XMCD also showed that the orbital magnetic moment was smaller when the magnetic field was applied perpendicular to the film than parallel to it, opposite to the Fe $L_{2,3}$-edge XMCD results although the anisotropy of the orbital magnetic moment increases with $S$ like the Fe edge. These results are qualitatively consistent with the first-principles calculation by Solovyev ${\it et\ al.}$ [Phys. Rev. B $\bf{52}$, 13419 (1995).], which also predicts the dominant contributions of Pt 5$d$ to the magnetic anisotropy energy rather than Fe 3$d$ due to the strong spin-orbit coupling and the small spin splitting of the Pt 5$d$ bands in $L{\rm1_0}$-ordered FePt.

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