Linear-response theory of the longitudinal spin Seebeck effect
Linear-response theory of the longitudinal spin Seebeck effect
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DOI：
10.3938/jkps.62.1753
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发表时间：
2012-09
影响因子：
0.6
通讯作者：
H. Adachi;S. Maekawa
中科院分区：
文献类型：
--
作者：
H. Adachi;S. Maekawa
我们从理论上研究了纵向自旋Seebeck效应，其中自旋电流沿平行于温度梯度的方向从铁磁体注入到附着的金属中。利用声子热流在这种特殊结构中强烈地流入附着的自旋金属的事实，我们证明了当自旋金属中的电子-声子相互作用足够大时，纵向自旋Seebeck效应中的自旋注入信号的符号可以与传统的横向自旋Seebeck效应中的自旋注入信号的符号相反.我们的线性响应方法可以解释最近观察到的纵向自旋Seebeck效应的自旋注入信号的符号反转。
We theoretically investigate the longitudinal spin Seebeck effect, in which the spin current is injected from a ferromagnet into an attached nonmagnetic metal in a direction parallel to the temperature gradient. Using the fact that the phonon heat current flows intensely into the attached nonmagnetic metal in this particular configuration, we show that the sign of the spin injection signal in the longitudinal spin Seebeck effect can be opposite to that in the conventional transverse spin Seebeck effect when the electron-phonon interaction in the nonmagnetic metal is sufficiently large. Our linear-response approach can explain the sign reversal of the spin injection signal recently observed in the longitudinal spin Seebeck effect.