Comparative study of tight-binding and ab initio electronic structure calculations focused on magnetic anisotropy in ordered CoPt alloy

Comparative study of tight-binding and ab initio electronic structure calculations focused on magnetic anisotropy in ordered CoPt alloy
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以有序 CoPt 合金磁各向异性为重点的紧束缚和从头算电子结构计算的比较研究

DOI:
10.1016/j.jmmm.2013.12.040
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发表时间:
2014
影响因子:
2.7
通讯作者:
Zemen J
Zemen J
中科院分区:
材料科学3区
文献类型:
--
作者:
Zemen J

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将包含磁性和自旋轨道耦合的经验多轨道(spd)紧密结合(TB)模型应用于CoPt l10结构的磁各向异性能(MAE)计算。单元素过渡金属的Slater-Koster参数化适用于有序二元合金。利用全势线性化增广平面波(LAPW)初始化方法和TB代码计算了不同原子间参数的自旋磁矩和态密度。对这些数据进行详细的相互比较,可以确定复合TB参数的一个子集,该子集的调整提高了TB和LAPW结果的一致性。使用改进参数计算的带填充函数MAE与所有价态的初始数据基本一致,与自然带填充的初始数据和实验数据在定量上一致。我们的工作为进一步利用与TB方法直接兼容的局部格林函数形式研究相对论磁输运各向异性提供了实践基础。
An empirical multiorbital (spd) tight binding (TB) model including magnetism and spin–orbit coupling is applied to calculations of magnetic anisotropy energy (MAE) in CoPt L10structure. A realistic Slater–Koster parametrisation for single-element transition metals is adapted for the ordered binary alloy. Spin magnetic moment and density of states are calculated using a full-potential linearised augmented plane-wave (LAPW)ab initiomethod and our TB code with different variants of the interatomic parameters. Detailed mutual comparison of this data allows for determination of a subset of the compound TB parameters tuning of which improves the agreement of the TB and LAPW results. MAE calculated as a function of band filling using the refined parameters is in broad agreement withab initiodata for all valence states and in quantitative agreement withab initioand experimental data for the natural band filling. Our work provides a practical basis for further studies of relativistic magnetotransport anisotropies by means of local Green's function formalism which is directly compatible with our TB approach.
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