Magnetostatic spin-wave modes of an in-plane magnetized garnet-film disk
Magnetostatic spin-wave modes of an in-plane magnetized garnet-film disk
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DOI：
10.1063/1.4794318
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发表时间：
2013-03
影响因子：
3.2
通讯作者：
E. Edwards;M. Buchmeier;V. Demidov;S. Demokritov
中科院分区：
文献类型：
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作者：
E. Edwards;M. Buchmeier;V. Demidov;S. Demokritov
基于低损耗石榴石薄膜的宏观结构是自旋波动力学空间分辨研究的理想模型系统。在这里，我们通过频域扫描磁光法拉第显微镜研究面内磁化石榴石薄膜盘的偶极本征模。由于所研究样本的宏观尺寸，我们已经能够对高达非常高阶的模式的空间轮廓进行成像。我们发现本征模动态磁化强度的空间分布受到面内磁化薄膜中偶极自旋波谱的固有各向异性的强烈影响。这些实验结果得到了微磁模拟的证实，微磁模拟准确地再现了模式的显着特征。
Macroscopic structures based on low-loss garnet films are an ideal model system for the space-resolved investigation of spin-wave dynamics. Here we investigate the dipolar eigenmodes of an in-plane magnetized garnet-film disk by means of scanning magneto-optical Faraday microscopy in the frequency domain. Due to the macroscopic dimensions of the studied samples, we have been able to image spatial profiles of the modes up to very high order. We find that the spatial distributions of the dynamic magnetization for the eigenmodes are strongly influenced by the intrinsic anisotropy of the dipolar spin-wave spectrum in an in-plane magnetized film. These experimental results are corroborated by micromagnetic simulations, which accurately reproduce the salient features of the modes.