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Spin-wave damping in ferromagnetic stripes with inhomogeneous magnetization

机译:具有不均匀磁化强度的铁磁条中的自旋波阻尼

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摘要

A theory is presented for the interactions between the dipole-exchange spin waves in ferromagnetic nanowires with a stripe geometry. A Hamiltonian-based approach is used in order to extend earlier results for the linear (or noninteracting) spin waves to include the leading nonlinear processes due to three-magnon and four-magnon effects in a stripe. As well as the magnetic dipole-dipole and exchange terms in the Hamiltonian, the role of an applied magnetic field that can be either parallel or perpendicular to the stripe axis is considered. Within a diagrammatic perturbation method the contributions to the frequency shift and damping of the quantized spin waves are deduced. Numerical calculations are presented for Permalloy stripes, and it is shown that the damping in the transverse field case, where the magnetization may become strongly inhomogeneous, can be larger than that in the longitudinal field case. Comparisons are made with recent damping measurements for Permalloy stripes in a longitudinal field.
机译:提出了一种具有条纹几何形状的铁磁纳米线中偶极交换自旋波之间相互作用的理论。使用基于哈密顿量的方法来扩展线性(或非相互作用)自旋波的早期结果,以包括由于条带中的三磁子和四磁子效应而导致的领先非线性过程。除了哈密顿量中的磁偶极子-偶极子和交换项外,还考虑了可以平行于或垂直于条纹轴的施加磁场的作用。在图解摄动方法中,可以得出对频移和量化自旋波阻尼的贡献。给出了坡莫合金条纹的数值计算结果,结果表明,在横向磁场情况下,磁化强度可能会变得非常不均匀,其阻尼比纵向磁场情况下的阻尼大。与最近在纵向场中坡莫合金条的阻尼测量进行了比较。

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