磁性薄膜自旋波共振的量子力学研究

The Quantum Theory for Spin-Wave Resonance in Magnetic Films

本文完全采用量子力学方法研究了体均匀铁磁性薄膜的自旋波共振激发,特别讨论了自旋波间的相互作用对共振谱的影响。在表面自旋完全钉扎的条件下,得到了三种共振激发谱。其中两种的共振谱大致呈现平方律关系,但另一种谱吸收能量后从双波态向单波态跃迁,其强度迅速衰减到最大强度的一半后保持不变,而共振峰的位置大致按照模数的平方增加。

The spectra of spin-wave resonance (SWR) in a volume homogeneoas ferromagnetic film are investigated from the quantum theory and the interactions between spin waves are considered especially. A new SWR absorotion spectrum is obtained when the transiti on from a two wave state to a single wave state takes place. Approximately,its intensities equal to the half of the maximal intensity and the multipeak positions change with the square of the modes.