磁场热处理对含钴的尖晶石型铁氧体共振线宽的影响

本文在Haas-Calln所提出的,由于从一个离子到另一个离子的自旋-轨道互作用的变化而引起的铁磁子散射的机构的基础上,考虑了含少量钴的正型尖晶石型铁氧体或Fe₃O₄内,磁场热处理对铁磁共振线宽的影响。由于钴离子在八面体位上有了择优分布,对共振线宽的贡献除了各向同性的部分外,还出现了一各向导性的部分,后者是热处理时所加磁场的方向及M的方向的函数。每百分之一的钴在正型铁氧体中所导致的最大与最小的线宽间的差值约为4奥。

THE EFFECT OF MAGNETIC ANNEALING ON THE FERROMAGNETIC RESONANCE LINEWIDTH IN COBALT-SUBSTITUTED FERRITES

The effect of magnetic annealing on the ferromagnetic resonance linewidth of a single crystal of normal ferrites or of ferrous ferrite containing a small concentration of substitutional Co²⁺ ions is calculated. The calculations are based on a mechanism of magnon scattering induced by the ion-to-ion variation of the spin-orbit interaction as suggested by Haas and Callen. The result obtained shows that besides the isotropic part of linewidth, there is an anisotropic part, which depends on the direction of the field applied during annealing as well as on the direction of magneti2ation. For each percent of cobalt the maximum directional variation of linewidth may be of the order of 4 oersted.