A contribution to the ferromagnetic resonance linewidth of M‐phase barium ferrite
A contribution to the ferromagnetic resonance linewidth of M‐phase barium ferrite
复制标题
M相钡铁氧体铁磁共振线宽的贡献
DOI：
10.1063/1.340778
复制
发表时间：
1988
影响因子：
3.2
通讯作者：
L. Silber
中科院分区：
文献类型：
--
作者：
E. Tsantes;L. Silber
对钡铁氧体的穆斯堡尔和中子衍射研究表明，当温度高于80k时，2b（三角双金字塔）位的铁离子在双金字塔镜面两侧的两个平衡位置之间振荡或跳跃。由于这种运动从一个（2b）点到另一个（2b）点是不相关的，由于各向异性能量的时变波动，它可以导致自旋波的双磁振子散射。利用时间相关摄动理论计算了该机制对铁氧体钡铁磁共振线宽的贡献。对于合理的参数值，该线宽在300k时约为10 Oe。
Mossbauer and neutron diffraction studies of barium ferrite show that the iron ion in the 2b (trigonal bipyramid) site oscillates or hops between two equilibrium positions on either side of the mirror plane of the bipyramid, for temperatures above 80 K. Since this motion is uncorrelated from one (2b) site to another, it can lead to two‐magnon scattering of spin waves due to the time‐dependent fluctuation in the anisotropy energy. The contribution of this mechanism to the ferromagnetic resonance linewidth of barium ferrite is calculated, using time‐dependent perturbation theory. For reasonable values of the parameters, this linewidth is of the order of 10 Oe at 300 K.