First-Principles Study on the Gilbert Damping Constants of Transition Metal Alloys, Fe–Ni and Fe–Pt Systems
First-Principles Study on the Gilbert Damping Constants of Transition Metal Alloys, Fe–Ni and Fe–Pt Systems
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过渡金属合金、Fe-Ni和Fe-Pt体系吉尔伯特阻尼常数的第一性原理研究
DOI：
10.1143/jpsj.81.084701
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发表时间：
2012
影响因子：
1.7
通讯作者：
A. Sakuma
中科院分区：
文献类型：
--
作者：
A. Sakuma
我们将紧束缚线性松饼罐轨道 (TB-LMTO) 方法应用于吉尔伯特阻尼常数 α 的扭矩相关模型，并在 CPA 框架内对无序过渡金属合金、Fe-Ni 和 Fe-Pt 系统进行第一性原理计算。定量地讲，计算出的α值约为实验值的二分之一，而α的费米能级依赖性的变化远大于这些差异。正如预期的那样，我们在 (Fe–Ni) 1- X Pt X 和 FePt 系统中证实，Pt 原子由于其大的自旋轨道耦合而肯定会增强 α。对于无序合金，我们发现α在很宽的范围内随着化学有序度的增加而减小。
We adapt the tight-binding linear muffin-tin orbital (TB-LMTO) method to the torque-correlation model for the Gilbert damping constant α and perform the first-principles calculation for disordered transition metal alloys, Fe–Ni and Fe–Pt systems, within the framework of the CPA. Quantitatively, the calculated α values are about one-half of the experimental values, whereas the variations in the Fermi level dependence of α are much larger than these discrepancies. As expected, we confirm in the (Fe–Ni) 1- X Pt X and FePt systems that Pt atoms certainly enhance α owing to their large spin–orbit coupling. For the disordered alloys, we find that α decreases with increasing chemical degree of order in a wide range.
影响因子：
2.3
作者：
Kotsugi, Masato;Mitsumata, Chiharu;Taniguchi, Masaki
通讯作者：
Taniguchi, Masaki
影响因子：
3.7
作者：
E. Simanek;B. Heinrich
通讯作者：
E. Simanek;B. Heinrich