Large Negative Magnetic Anisotropy of W/Fe/W (001) Epitaxial Trilayers
Large Negative Magnetic Anisotropy of W/Fe/W (001) Epitaxial Trilayers
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W/Fe/W (001) 外延三层膜的大负磁各向异性
DOI：
10.1109/tmag.2015.2432074
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发表时间：
2015
影响因子：
2.1
通讯作者：
N. Kawamura
中科院分区：
文献类型：
--
作者：
Y. Matsumoto;S. Okamoto;N. Kikuchi;O. Kitakami;Y. Miura;M. Suzuki;M. Mizumaki;N. Kawamura
本文报道了W/Fe/W(001)外延三层膜具有很大的负单轴磁各向异性Ku。Ku的大小随着Fe层厚度的减小而增大，对于0.5 nm的Fe层厚度，Ku随温度的变化范围从300K的-2.1×107erg/cc到10K的-3.5×107erg/cc。较大的负Ku是由于W/Fe界面的界面磁各向异性所致，并可用第一性原理计算定量地再现。室温X射线磁性圆二色谱测量表明，界面W原子的极化方向与Fe的磁矩成反比。在低温下，界面W的感应磁矩几乎是第一原理计算和前人实验结果的一半。这种小的感生W矩可以归因于负Ku的显著温度依赖性。
In this paper, we report that W/Fe/W (001) epitaxial trilayer films exhibit very large negative uniaxial magnetic anisotropy Ku. The magnitude of Ku increases with decreasing the Fe layer thickness and also exhibits significant temperature dependence varying from -2.1 × 107 erg/cc at 300 K to -3.5 × 107 erg/cc at 10 K for the Fe layer thickness of 0.5 nm. The large negative Ku is attributable to interface magnetic anisotropy in nature at the W/Fe interface and can be quantitatively reproduced by the firstprinciples calculation. The X-ray magnetic circular dichroism measurement at room temperature has revealed that the interfacial W atom is polarized in antiparallel with the magnetic moment of Fe. The induced magnetic moment of the interfacial W is almost the half of the values obtained by the first-principles calculation and the previous experiment at low temperature. This small induced W moment may be ascribed to the significant temperature dependence of the negative Ku.
影响因子：
3.2
作者：
Hashimoto, Atsushi;Saito, Shin;Takahashi, Migaku
通讯作者：
Takahashi, Migaku