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arXiv 1906.01042cond-mat.str-elcond-mat.mes-hall
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磁性绝缘体中的磁振子-声子相互作用

Magnon-phonon interactions in magnetic insulators

Simon Streib, Nicolas Vidal-Silva, Ka Shen, Gerrit E. W. Bauer

摘要:

我们解决磁振子-声子相互作用的理论和计算相应的准粒子和运输寿命在磁性绝缘体中,专注于钇铁石榴石在中间温度从各向异性和交换介导的磁振子-声子相互作用,后者是来自体积依赖的居里温度。我们发现,在一般弱的影响声子散射的磁振子输运和吉尔伯特阻尼的宏自旋Kittel模式。在较短的波长下,磁振子输运寿命不同于准粒子寿命。

英文摘要:

We address the theory of magnon-phonon interactions and compute the corresponding quasi-particle and transport lifetimes in magnetic insulators with focus on yttrium iron garnet at intermediate temperatures from anisotropy- and exchange-mediated magnon-phonon interactions, the latter being derived from the volume dependence of the Curie temperature. We find in general weak effects of phonon scattering on magnon transport and the Gilbert damping of the macrospin Kittel mode. The magnon transport lifetime differs from the quasi-particle lifetime at shorter wavelengths.

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