文献类型：期刊文献

英文题名：Spin thermoelectric efficiency across a normal-metal/ferromagnetic-insulator interface

作者：Yan, Yonghong[1];Wu, Haifei[1];Jiang, Feng[2]

机构：[1]Shaoxing Univ, Dept Phys, Shaoxing 312000, Peoples R China;[2]Shanghai Univ Elect Power, Dept Math & Phys, Shanghai 200090, Peoples R China

年份：2016

卷号：494

起止页码：59

外文期刊名：PHYSICA B-CONDENSED MATTER

收录：SCI-EXPANDED(收录号：WOS:000377026200010)、、EI(收录号：20161802338683)、Scopus(收录号：2-s2.0-84964613898)、WOS

基金：The work was supported by the NSFC (Grant Nos. 51202149 and 11575116).

语种：英文

外文关键词：Spin thermopower; Thermoelectric properties; Figure of merit

外文摘要：We investigate the spin and heat transport across a normal-metal/ferromagnetic-insulator (NM/FI) interface based on the s-d exchange model. Under a certain temperature gradient, the heat current carried by magnons partly flows into the metal, and is partly converted to spin power corresponding to spin current. We find that when the magnon dispersion of the Fl (such as yttrium iron garnet) is quadratic, the conversion efficiency of heat current to spin power is about eta(s) similar to 0.2 eta(C) with yic being the Carnot efficiency. The corresponding spin thermopower is roughly Ss similar to 110 mu V/K. The efficiency and the spin thermopower can be enhanced by opening a gap via, for example, introducing a magnetic field. Effects of temperature in the presence of a gap and dimensionality are also discussed briefly. (C) 2016 Elsevier B.V. All rights reserved.