Spectral characteristics of time resolved magnonic spin Seebeck effect
Spectral characteristics of time resolved magnonic spin Seebeck effect
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DOI：
10.1063/1.4931701
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发表时间：
2015-09
影响因子：
4
通讯作者：
S. R. Etesami;L. Chotorlishvili;J. Berakdar
中科院分区：
文献类型：
--
作者：
S. R. Etesami;L. Chotorlishvili;J. Berakdar
自旋塞贝克效应（SSE）为低能耗的新型自旋电子器件带来了希望。对于进一步的进展至关重要的基本物理学尚未完全澄清。这项研究的时间分辨纵向SSE的磁性绝缘体钇铁石榴石的结论是，一个重大的贡献，自旋电流源于小波矢量亚热交换磁振子。我们的发现与S. R. Boona和J.P. Heremans [Phys. Rev. B 90，064421（2014）]。在技术上，自旋电流动力学处理的Landau-Lifshitz-吉尔伯特方程的基础上，还包括磁振子对热浴的反作用，而形成的时间相关的热梯度通过热方程耦合到磁化动力学自洽描述。
Spin Seebeck effect (SSE) holds promise for new spintronic devices with low-energy consumption. The underlying physics, essential for a further progress, is yet to be fully clarified. This study of the time resolved longitudinal SSE in the magnetic insulator yttrium iron garnet concludes that a substantial contribution to the spin current stems from small wave-vector subthermal exchange magnons. Our finding is in line with the recent experiment by S. R. Boona and J. P. Heremans [Phys. Rev. B 90, 064421 (2014)]. Technically, the spin-current dynamics is treated based on the Landau-Lifshitz-Gilbert equation also including magnons back-action on thermal bath, while the formation of the time dependent thermal gradient is described self-consistently via the heat equation coupled to the magnetization dynamics.