钇铁石榴石薄膜中磁振子的磁弹模和寿命
Magneto-elastic modes and lifetime of magnons in thin yttrium-iron garnet films
摘要：
本文计算了自旋-晶格耦合对磁性绝缘体钇铁石榴石铁磁薄膜磁振子谱的影响。磁振子-声子杂化在自旋动力学结构因子中产生一个特征最小值，这与最近的布里渊光散射实验定量一致。我们还表明，在室温下的声子对磁振子阻尼的贡献表现出相当复杂的动量依赖性：在交换制度的磁振子阻尼主要由切伦科夫型散射过程，而在长波长偶极制度，这些过程是次主导和磁振子阻尼是两个数量级小。我们补充我们的计算实际测量的磁振子弛豫的偶极制度。我们的理论提供了一个简单的解释，最近的实验探测不同温度的磁振子和声子气体在钇铁石榴石。
英文摘要：
We calculate the effects of the spin-lattice coupling on the magnon spectrum of thin ferromagnetic films consisting of the magnetic insulator yttrium-iron garnet. The magnon-phonon hybridisation generates a characteristic minimum in the spin dynamic structure factor which quantitatively agrees with recent Brillouin light scattering experiments. We also show that at room temperature the phonon contribution to the magnon damping exhibits a rather complicated momentum dependence: In the exchange regime the magnon damping is dominated by Cherenkov type scattering processes, while in the long-wavelength dipolar regime these processes are subdominant and the magnon damping is two orders of magnitude smaller. We supplement our calculations by actual measurements of the magnon relaxation in the dipolar regime. Our theory provides a simple explanation of a recent experiment probing the different temperatures of the magnon and phonon gases in yttrium-iron garnet.
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