Nonlinear Studies in Magnetic Garnet Films

本研究包括对非线性现象的研究， 铁磁薄膜 在薄膜中， 磁交换模式，简化了比较与 理论，因为（哈密顿量的）截断过程变成了 更简单。 计划是研究不同厚度的样本 从而具有不同的静磁模式密度， 磁化强度、各向异性能、温度 和频率。 还将努力取代一些 磁离子与磁离子，以研究对 自旋波色散系数 除了模式锁定和 模式抑制噪声的影响也将被研究。 分析模型将得到扩展，以纳入更多模式， 取得更好的效果。 隐藏模式的效果将是 考虑，和随机相位近似的有效性将 审查，有可能取消这一要求， 非激励模式。

This research inolves the study of nonlinear phenomena in ferromagnetic thin films. In thin films there are a samller number of magneto-exchange modes which simplifies the comparison with theory because the truncation process (of the Hamiltonian) becomes simpler. The plan is to study samples with different thicknesses thus having different densities of magnetostatic modes, determining the dependences on magnetization, anisotropy energy, temperature and frequency. There will also be an effort to replace some of the magnetic ions with nonmagnetic ions to study the effect on the spinwave dispersion coefficient. In addition to mode locking and modes suppression the effects of noise will also be investigated. The analytical model will be extended to incorporate more modes to obtain better results. The effects of hidden modes will be considered, and the validity of the random phase approximation will be examined, with the possibility of removing this requirement on the non-excited modes.