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arXiv 1607.03263cond-mat.mtrl-sci
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钇铁石榴石的热自旋动力学

Thermal spin dynamics of yttrium iron garnet

Joseph Barker, Gerrit E. W. Bauer

摘要:

钇铁石榴石是用于研究纯自旋电流的原型材料。它是一种复杂的材料,在晶胞中有20个磁性原子。几乎所有的理论和实验分析都将这种复杂的材料近似为具有单一自旋波模式的简单铁磁体。我们用原子自旋动力学方法研究了全20模交换自旋波谱的温度演化。我们的研究结果表明,与中子散射实验定量一致的模式的强烈的频率依赖性。我们发现,这是由于与FMR模式相反的手征的光学模式的热占据在净自旋泵浦的减少的原因。

英文摘要:

Yttrium Iron Garnet is the prototypical material used to study pure spin currents. It is a complex material with 20 magnetic atoms in the unit cell. Almost all theories and experimental analysis approximates this complicated material to a simple ferromagnet with a single spin wave mode. We use the method of atomistic spin dynamics to study the temperature evolution of the full 20 mode exchange spin wave spectrum. Our results show a strong frequency dependence of the modes in quantitative agreement with neutron scattering experiments. We find this causes in a reduction in the net spin pumping due to the thermal occupation of optical modes with the opposite chirality to the FMR mode.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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