Theory of spin transport through an antiferromagnetic insulator
Theory of spin transport through an antiferromagnetic insulator
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DOI：
10.1103/physrevb.99.180405
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发表时间：
2019-03
影响因子：
3.7
通讯作者：
G. Tatara;Christian Ortiz Pauyac
中科院分区：
文献类型：
--
作者：
G. Tatara;Christian Ortiz Pauyac
本文给出了在两重金属接触中由自旋霍尔效应驱动/探测自旋通过反铁磁绝缘体的理论公式。自旋信号被证明是由反铁磁体的铁磁相关函数，这是计算的基础上的磁振子表示。为了覆盖高温制度，我们包括一个辅助字段表示短AF相关性和温度依赖性阻尼由于磁振子散射。自旋的扩散长度与两个AF磁振子的简并度接近，并且在N 'eel跃迁附近有一个最大值.
A theoretical formulation for spin transport through an antiferromagnetic (AF) insulator is presented in the case driven/detected by direct/inverse spin Hall effect in two heavy metal contacts. The spin signal is shown to be transferred by the ferromagnetic correlation function of the antiferromagnet, which is calculated based on a magnon representation. To cover high temperature regimes, we include an auxiliary field representing short AF correlations and a temperature-dependent damping due to magnon scattering. The diffusion length for spin is long close to the degeneracy of the two AF magnons, and has a maximum as function of temperature near the N\'eel transition.