Covington M, Crawford T M, Parker G J
Seagate Research, 1251 Waterfront Place, Pittsburgh, Pennsylvania 15222, USA.
Phys Rev Lett. 2002 Dec 2;89(23):237202. doi: 10.1103/PhysRevLett.89.237202. Epub 2002 Nov 13.
We measure the propagation of spatially localized spin waves in NiFe thin films through local inductive detection of the dynamic magnetization. A pulsed magnetic field excites a linear superposition of spin wave modes with a distribution that is predominantly driven by the spatial dependence of the in-plane excitation field. The results of numerical micromagnetic calculations exhibit excellent agreement with experiment and show that a comprehensive account of spatial nonuniformity and propagation is necessary to accurately measure the intrinsic damping rate.
我们通过对动态磁化强度进行局部感应检测，来测量NiFe薄膜中空间局域自旋波的传播。脉冲磁场激发自旋波模式的线性叠加，其分布主要由面内激发场的空间依赖性驱动。微磁学数值计算结果与实验结果吻合良好，表明要准确测量本征阻尼率，必须全面考虑空间不均匀性和传播情况。
