Spin Seebeck effect in the layered ferromagnetic insulators CrSiTe3 and CrGeTe3
Spin Seebeck effect in the layered ferromagnetic insulators CrSiTe3 and CrGeTe3
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DOI：
10.1103/physrevb.100.060402
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发表时间：
2019-08-05
影响因子：
3.7
通讯作者：
Saitoh, Eiji
中科院分区：
文献类型：
--
作者：
Ito, Naohiro;Kikkawa, Takashi;Saitoh, Eiji
在自旋电流穿过铁磁铬层的测量结构中，我们研究了由铂薄膜覆盖的层状铁磁绝缘体CrSiTe3和CrGeTe3中的纵向自旋Seebeck效应(LSSE)。与标准的LSSE磁体Y3Fe5O12不同，LSSE响应在铁磁相中明显观察到，并且在CrSiTe3/Pt和CrGeTe3/Pt样品中都保持在临界温度以上。通过数值计算，我们将在顺磁区观测到的LSSE信号归因于由短程铁磁关联和强塞曼效应强化的面内顺磁矩的交换主导的层间输运。
We have studied the longitudinal spin Seebeck effect (LSSE) in the layered ferromagnetic insulators CrSiTe3 and CrGeTe3 covered by Pt films in the measurement configuration where spin current traverses the ferromagnetic Cr layers. The LSSE response is clearly observed in the ferromagnetic phase and, in contrast to a standard LSSE magnet Y3Fe5O12, persists above the critical temperatures in both CrSiTe3/Pt and CrGeTe3/Pt samples. With the help of a numerical calculation, we attribute the LSSE signals observed in the paramagnetic regime to exchange-dominated interlayer transport of in-plane paramagnetic moments reinforced by short-range ferromagnetic correlations and strong Zeeman effects.