Room temperature and low-field resonant enhancement of spin Seebeck effect in partially compensated magnets
Room temperature and low-field resonant enhancement of spin Seebeck effect in partially compensated magnets
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DOI：
10.1038/s41467-019-13121-5
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发表时间：
2019-03
影响因子：
16.6
通讯作者：
Rafael Ramos;T. Hioki;Yusuke Hashimoto;T. Kikkawa;P. Frey;Alexander J. E. Kreil;V. Vasyuchka;A. Serga;B. Hillebrands;Eiji Saitoh
中科院分区：
文献类型：
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作者：
Rafael Ramos;T. Hioki;Yusuke Hashimoto;T. Kikkawa;P. Frey;Alexander J. E. Kreil;V. Vasyuchka;A. Serga;B. Hillebrands;Eiji Saitoh
最近在YFeO(YIG)中发现了声子引起的自旋塞贝克效应(SSE)的共振增强。这种效应可以用磁振子色散和声子色散的杂化来解释。然而，这种效应在低温和强磁场下观察到，限制了应用范围。本文报道了在室温和低磁场条件下观察到的SSE声子共振增强现象。我们观察到在10T附近的极低磁场下，LuBiFeGaOan的增强比YIG膜的增强大700%，几乎比YIG低一个数量级。这一结果可以用非磁性离子取代引起的磁补偿引起的磁振子色散的变化来解释。我们的研究提供了一种通过化学掺杂来调节晶体中的磁振子响应的方法，在自旋电子器件中具有潜在的应用前景。
Resonant enhancement of spin Seebeck effect (SSE) due to phonons was recently discovered in YFeO(YIG). This effect is explained by hybridization between the magnon and phonon dispersions. However, this effect was observed at low temperatures and high magnetic fields, limiting the scope for applications. Here we report observation of phonon-resonant enhancement of SSE at room temperature and low magnetic field. We observe in LuBiFeGaOan enhancement 700% greater than that in a YIG film and at very low magnetic fields around 10T, almost one order of magnitude lower than that of YIG. The result can be explained by the change in the magnon dispersion induced by magnetic compensation due to the presence of non-magnetic ion substitutions. Our study provides a way to tune the magnon response in a crystal by chemical doping, with potential applications for spintronic devices.