Concomitant enhancement of the longitudinal spin Seebeck effect and the thermal conductivity in a Pt/YIG/Pt system at low temperatures
Concomitant enhancement of the longitudinal spin Seebeck effect and the thermal conductivity in a Pt/YIG/Pt system at low temperatures
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DOI：
10.1103/physrevb.95.174401
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发表时间：
2017-05-01
影响因子：
3.7
通讯作者：
Saitoh, Eiji
中科院分区：
文献类型：
--
作者：
Iguchi, Ryo;Uchida, Ken-ichi;Saitoh, Eiji
我们报道了在10-300K温度范围内同时测量了铂/Y3Fe5O12(YIG)/铂体系的纵向自旋塞贝克效应(LSSE)和热导率。通过直接监测系统中的温差，我们排除了LSSE测量中的热伪影。与以往报道不同的是，YIG的LSSE信号和热导率在相同的温度下都出现了尖锐的峰值。最大的LSSE系数为S-LSSE&>10µV/K，比以前报道的值大一个数量级。LSSE和YIG导热系数的同时增强表明，LSSE中的磁振子和声子输运之间存在着很强的相关性。
We report a simultaneous measurement of a longitudinal spin Seebeck effect (LSSE) and thermal conductivity in a Pt/Y3Fe5O12 (YIG)/Pt system in a temperature range from 10 to 300 K. By directly monitoring the temperature difference in the system, we excluded thermal artifacts in the LSSE measurements. It is found that both the LSSE signal and the thermal conductivity of YIG exhibit sharp peaks at the same temperature, different from previous reports. The maximum LSSE coefficient is found to be S-LSSE > 10 mu V/K, one-order-of magnitude greater than the previously reported values. The concomitant enhancement of the LSSE and thermal conductivity of YIG suggests the strong correlation between magnon and phonon transport in the LSSE.