Investigation of the unidirectional spin heat conveyer effect in a 200 nm thin Yttrium Iron Garnet film.
Investigation of the unidirectional spin heat conveyer effect in a 200 nm thin Yttrium Iron Garnet film.
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DOI：
10.1038/srep28233
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发表时间：
2016-06-17
影响因子：
4.6
通讯作者：
Schmidt G
中科院分区：
文献类型：
--
作者：
Wid O;Bauer J;Müller A;Breitenstein O;Parkin SS;Schmidt G
利用锁相热成像技术研究了亚微米厚度钇铁石榴石（YIG）薄膜中的单向自旋波热传输效应。虽然效果是小的薄层，这种技术使我们能够观察到不对称的热传输磁振子，导致不对称的温度分布不同的几个MK两侧的激励天线，分别。Damon-Eshbach和后向体积模式的比较表明，单向热流确实是由于非互易自旋波。由于有限的线宽，小的不对称性仍然可以观察到时，只有均匀的铁磁共振模式被激发。后者是非常重要的，例如当测量逆自旋霍尔效应时，因为温度差可能导致接触处的热电压。由于非互易性，这些热电压随着磁场的反转而反转其符号，这通常被认为是反自旋霍尔电压的特征。
We have investigated the unidirectional spin wave heat conveyer effect in sub-micron thick yttrium iron garnet (YIG) films using lock-in thermography (LIT). Although the effect is small in thin layers this technique allows us to observe asymmetric heat transport by magnons which leads to asymmetric temperature profiles differing by several mK on both sides of the exciting antenna, respectively. Comparison of Damon-Eshbach and backward volume modes shows that the unidirectional heat flow is indeed due to non-reciprocal spin-waves. Because of the finite linewidth, small asymmetries can still be observed when only the uniform mode of ferromagnetic resonance is excited. The latter is of extreme importance for example when measuring the inverse spin-Hall effect because the temperature differences can result in thermovoltages at the contacts. Because of the non-reciprocity these thermovoltages reverse their sign with a reversal of the magnetic field which is typically deemed the signature of the inverse spin-Hall voltage.