Anisotropic Spin Distribution and Perpendicular Magnetic Anisotropy in a Layered Ferromagnetic Semiconductor (Ba,K)(Zn,Mn)2As2
Anisotropic Spin Distribution and Perpendicular Magnetic Anisotropy in a Layered Ferromagnetic Semiconductor (Ba,K)(Zn,Mn)2As2
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DOI：
10.1021/acsaelm.0c00938
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发表时间：
2020-10
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影响因子：
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通讯作者：
S. Sakamoto;Guoqiang Zhao;G. Shibata;Z. Deng;K. Zhao;Xiancheng Wang;Y. Nonaka;K. Ikeda;Z. Chi;Yuxuan Wan;Masahiro Suzuki;T. Koide;A. Tanaka;S. Maekawa;Y. Uemura;C. Jin;A. Fujimori
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文献类型：
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作者：
S. Sakamoto;Guoqiang Zhao;G. Shibata;Z. Deng;K. Zhao;Xiancheng Wang;Y. Nonaka;K. Ikeda;Z. Chi;Yuxuan Wan;Masahiro Suzuki;T. Koide;A. Tanaka;S. Maekawa;Y. Uemura;C. Jin;A. Fujimori
本文用X射线磁性圆二色性测量方法研究了新铁磁半导体（Ba，K）（Zn，Mn）As 2的各向异性。通过将Stoner-Wohlfarth模型拟合到投影磁矩的磁场角度依赖性，推导出具有0.85 T各向异性场的大磁各向异性。横向XMCD谱显示Mn 3 $d $电子的各向异性分布，其中d_{xz}$和d_{yz}$轨道比d_{xy}$态少，这是由于伸长的MnAs$_{4}$四面体引起的$D_{2d}$分裂。认为磁各向异性源于自旋沿着z方向排列时，费米能级上p-d {xz}$，d {yz}$杂化态的简并提升和自旋轨道耦合产生的能量增益.
Perpendicular magnetic anisotropy of the new ferromagnetic semiconductor (Ba,K)(Zn,Mn)$_{2}$As$_{2}$ is studied by angle-dependent x-ray magnetic circular dichroism measurements. The large magnetic anisotropy with the anisotropy field of 0.85 T is deduced by fitting the Stoner-Wohlfarth model to the magnetic-field-angle dependence of the projected magnetic moment. Transverse XMCD spectra highlights the anisotropic distribution of Mn 3$d$ electrons, where the $d_{xz}$ and $d_{yz}$ orbitals are less populated than the $d_{xy}$ state because of the $D_{2d}$ splitting arising from the elongated MnAs$_{4}$ tetrahedra. It is suggested that the magnetic anisotropy originates from the degeneracy lifting of $p$-$d_{xz}$, $d_{yz}$ hybridized states at the Fermi level and resulting energy gain due to spin-orbit coupling when spins are aligned along the $z$ direction.