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Effect of the magnon dispersion on the longitudinal spin Seebeck effect in yttrium iron garnets

机译:磁振子扩散对钇铁石榴石纵向自旋塞贝克效应的影响

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摘要

We study the temperature dependence of the longitudinal spin Seebeck effect (LSSE) in an yttrium iron garnet Y_3Fe_5O_(12) (YIG)/Pt system for samples of different thicknesses. In this system, the thermal spin torque is magnon driven. The LSSE signal peaks at a specific temperature that depends on the YIG sample thickness. We also observe freeze-out of the LSSE signal at high magnetic fields, which we attribute to the opening of an energy gap in the magnon dispersion. We observe partial freeze-out of the LSSE signal even at room temperature, where k_BT is much larger than the gap. This suggests that a subset of the magnon population with an energy below K_bT_c (Tc ~ 40 K) contributes disproportionately to the LSSE; at temperatures above T_c, we label these magnons subthermal magnons. The T dependence of the LSSE at temperatures below the maximum is interpreted in terms of an empirical model that ascribes most of the temperature dependence to that of the thermally driven magnon flux, which is related to the details of the magnon dispersion.
机译:我们研究了钇铁石榴石Y_3Fe_5O_(12)(YIG)/ Pt系统中不同厚度样品的纵向自旋塞贝克效应(LSSE)的温度依赖性。在该系统中,热自旋扭矩是磁振驱动的。 LSSE信号在取决于YIG样品厚度的特定温度下达到峰值。我们还观察到高磁场下LSSE信号的冻结,这归因于磁振子色散中能隙的打开。我们观察到即使在室温下LSSE信号也会部分冻结,其中k_BT远大于间隙。这表明能量低于K_bT_c(Tc〜40 K)的一部分磁振子对LSSE的贡献不成比例。在高于T_c的温度下,我们将这些磁振子标记为亚热磁振子。 LSSE在低于最高温度时的T依赖性可以通过经验模型来解释,该模型将大部分温度依赖性归因于热驱动的磁振子通量,这与磁振子色散的细节有关。

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  • 来源
    《Physical review》 |2015年第5期|054436.1-054436.8|共8页
  • 作者单位

    Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio 43210, USA;

    Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio 43210, USA;

    Department of Electrical and Computer Engineering, The Ohio State University, Columbus, Ohio 43210, USA;

    Department of Electrical and Computer Engineering, The Ohio State University, Columbus, Ohio 43210, USA,Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210, USA,Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA;

    Department of Mechanical and Aerospace Engineering, The Ohio State University, Columbus, Ohio 43210, USA,Department of Materials Science and Engineering, The Ohio State University, Columbus, Ohio 43210, USA,Department of Physics, The Ohio State University, Columbus, Ohio 43210, USA;

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