Direct Measurement of Magnon Temperature: New Insight into Magnon-Phonon Coupling in Magnetic Insulators
Direct Measurement of Magnon Temperature: New Insight into Magnon-Phonon Coupling in Magnetic Insulators
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DOI：
10.1103/physrevlett.111.107204
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发表时间：
2013-09-04
影响因子：
8.6
通讯作者：
Hillebrands, B.
中科院分区：
文献类型：
--
作者：
Agrawal, M.;Vasyuchka, V. I.;Hillebrands, B.
我们给出了具有热梯度的磁绝缘体中磁振子温度的空间分辨测量。我们的数据揭示了交换磁振子和声子温度的空间相关性之间出人意料的密切对应。这些结果表明，如果像目前认为的那样，横向自旋塞贝克效应是由磁振子和声子浴之间的温差引起的，那么肯定是磁振子温度在光谱上是不均匀的，并且该效应是由磁振子谱的稀疏偶极区域驱动的。
We present spatially resolved measurements of the magnon temperature in a magnetic insulator subject to a thermal gradient. Our data reveal an unexpectedly close correspondence between the spatial dependencies of the exchange magnon and phonon temperatures. These results indicate that if-as is currently thought-the transverse spin Seebeck effect is caused by a temperature difference between the magnon and phonon baths, it must be the case that the magnon temperature is spectrally nonuniform and that the effect is driven by the sparsely populated dipolar region of the magnon spectrum.