One dimensional Cherenkov processes in ferromagnetic insulator

One dimensional Cherenkov processes in ferromagnetic insulator
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铁磁绝缘体中的一维切伦科夫过程

DOI:
10.1063/1.5070083
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发表时间:
2017-10
期刊:
J. Appl. Phys.
影响因子:
--
通讯作者:
Chenglong Jia
Chenglong Jia
中科院分区:
其他
文献类型:
--
作者:
Tongli Wei;Yaojin Li;Decheng Ma;Chenglong Jia

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在能量动量守恒约束条件下,用微扰理论研究了铁磁绝缘子中的一维切伦科夫过程。结果表明,长波长磁振子的寿命和弛豫时间分别为1 / k2和1 / k4,且磁振子-声子相互作用通道是有限的,且与波数有关。在高温区,磁振子和声子之间的弛豫时间倒数为1 / τ mp,是温度的线性递增函数。基于Sanders-Walton模型,我们进一步表明,当沿系统施加热(声子)梯度时,随着k的减小,声子槽和具有波矢量k的磁振子之间的温差变得更加明显。
One dimensional Cherenkov processes in ferromagnetic insulators are studied with perturbation theory under the constraint condition of conservation of energy and momentum. It is shown that the magnon-phonon interaction channels are limited and wave number dependent, which result in, respectively, 1 / k 2 and 1 / k 4 dependence of the lifetime and the relaxation time of long wavelength magnons. The reciprocal of relaxation time between magnons and phonons, 1 / τ m p, is found to be a linearly increasing function of the temperature in the high temperature regime. Based on the Sanders-Walton model, we further show that when a thermal (phonon) gradient is applied along the system, the temperature difference between the phonon bath and the magnons with wave-vector k becomes more pronounced as k decreases.
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