FeNi film was fabricated on Cu/MgO (001) substrates using thermal evaporation technique of a FeNi target to realize the formation of an L1₀-FeNi phase. The magnetic anisotropy of FeNi film was systematically investigated by means of X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) techniques. Our L-edge XAS and XMCD analysis is performed for 30-nm FeNi film grown on Cu/MgO (001) substrate. The present experimental results of XAS and XMCD indicate that ~5% Fe atoms are oxidized. Our findings also showed that the orbital magnetic moment of Fe has a significant incident X-ray angle dependence that exhibits a maximum value at the out-of-plane direction corresponding perpendicular to the plane. The origin of anisotropy is successfully explained by element-specific XMCD technique. The enhancement in magnetic anisotropy energy (MAE) is due to orbital magnetic moments of Fe through spin–orbit interaction. The uniaxial anisotropy energy showed quantitatively good agreement with the volume MAE.

中文翻译：

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热蒸发 FeNi 薄膜的磁各向异性：软 X 射线磁圆二色性研究

使用FeNi靶的热蒸发技术在Cu/MgO(001)衬底上制备FeNi膜以实现L 1 ₀ -FeNi相的形成。通过X射线吸收光谱（XAS）和X射线磁圆二色性（XMCD）技术系统地研究了FeNi薄膜的磁各向异性。我们的L对在 Cu/MgO (001) 衬底上生长的 30-nm FeNi 膜进行 -edge XAS 和 XMCD 分析。XAS 和 XMCD 的当前实验结果表明~5% 的 Fe 原子被氧化。我们的研究结果还表明，Fe 的轨道磁矩具有显着的入射 X 射线角度依赖性，在垂直于平面的面外方向上表现出最大值。元素特异性 XMCD 技术成功解释了各向异性的起源。磁各向异性能 (MAE) 的增强是由于 Fe 通过自旋轨道相互作用的轨道磁矩。单轴各向异性能量与体积 MAE 在数量上表现出良好的一致性。