Antiferromagnetic spin Seebeck effect across the spin-flop transition: A stochastic Ginzburg-Landau simulation
Antiferromagnetic spin Seebeck effect across the spin-flop transition: A stochastic Ginzburg-Landau simulation
复制标题
DOI：
10.1103/physrevb.105.104417
复制
发表时间：
2021-12
影响因子：
3.7
通讯作者：
Y. Yamamoto;M. Ichioka;H. Adachi
中科院分区：
文献类型：
--
作者：
Y. Yamamoto;M. Ichioka;H. Adachi
基于含时的Ginzburg-Landau方程，对单轴绝缘反铁磁体和相邻金属的双层膜进行了数值模拟，研究了自旋翻转过程中的反铁磁自旋Seebeck效应.通过直接模拟相邻金属层中导电电子自旋密度s的变化率，我们证明了当反铁磁材料的交错磁化强度n与导电电子自旋密度s的界面耦合占主导地位时，反铁磁自旋Seebeck效应在自旋翻转跃迁中发生符号反转，而当导电电子与反铁磁材料的交错磁化强度m的界面耦合占主导地位时，没有符号反转出现。此外，我们表明，符号反转的影响程度的自旋退相的金属层。我们的结果表明，符号反转不是一个简单的单轴反铁磁体的一般属性，但控制的微观细节的交换耦合在界面处和自旋退相的金属层。
We investigate the antiferromagnetic spin Seebeck effect across the spin-flop transition in a numerical simulation based on the time-dependent Ginzburg-Landau equation for a bilayer of a uniaxial insulating antiferromagnet and an adjacent metal. By directly simulating the rate of change of the conduction-electron spin density s in the adjacent metal layer, we demonstrate that a sign reversal of the antiferromagnetic spin Seebeck effect across the spin-flop transition occurs when the interfacial coupling of s to the staggered magnetization n of the antiferromagnet dominates, whereas no sign reversal appears when the interfacial coupling of s to the magnetization m dominates. Moreover, we show that the sign reversal is influenced by the degree of spin dephasing in the metal layer. Our result indicates that the sign reversal is not a generic property of a simple uniaxial antiferromagnet, but controlled by microscopic details of the exchange coupling at the interface and the spin dephasing in the metal layer.