arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1601.01982cond-mat.mtrl-sci
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磁绝缘体中磁振子和声子被光驱动脱离局域平衡

Magnons and Phonons Optically Driven Out of Local Equilibrium in a Magnetic Insulator

Kyongmo An, Kevin S. Olsson, Annie Weathers, Sean Sullivan, Xi Chen, Xiang Li, Luke G. Marshall, Xin Ma, Nikita Klimovich, Jianshi Zhou, Li Shi, Xiaoqin Li

摘要:

磁振子是基本自旋激发的能量量子,即自旋波,它们可以以与晶格振动波或声子类似的方式对某些磁性材料中的能量输运做出相当大的贡献。磁振子和其他能量载体之间的耦合和可能的非平衡已经被用来解释最近发现的几种热驱动自旋输运和能量转换现象。在这里,我们报告的实验中,局部非平衡磁振子和声子之间的单晶体磁性绝缘体,Y3Fe5O12(钇铁石榴石,或YIG),已创建光学内的聚焦激光光斑和探测直接使用微布里渊光散射(BLS)。利用热致磁振子扩散模型对实验结果进行了分析,得到了热磁振子的磁振子扩散长度。通过明确地建立磁振子和声子之间的非平衡,我们的研究代表了对各种自旋热耦合现象的定量理解的重要一步。

英文摘要:

Magnons are the energy quanta of fundamental spin excitations, namely spin waves, and they can make a considerable contribution to energy transport in some magnetic materials in a similar manner as lattice vibration waves or phonons. The coupling and possible non-equilibrium between magnons and other energy carriers have been used to explain several recently discovered thermally driven spin transport and energy conversion phenomena. Here, we report experiments in which local non-equilibrium between magnons and phonons in a single crystalline bulk magnetic insulator, Y3Fe5O12 (yttrium iron garnet, or YIG), has been created optically within a focused laser spot and probed directly with the use of micro-Brillouin light scattering (BLS). By analyzing the experimental results with a thermally induced magnon diffusion model, we obtain the magnon diffusion length of thermal magnons. By explicitly establishing non-equilibrium between magnons and phonons, our studies represent an important step toward a quantitative understanding of various spin-heat coupling phenomena.

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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