Ferromagnetic resonance study of Co/Pd/Co/Ni multilayers with perpendicular anisotropy irradiated with helium ions
Ferromagnetic resonance study of Co/Pd/Co/Ni multilayers with perpendicular anisotropy irradiated with helium ions
复制标题
氦离子辐照垂直各向异性Co/Pd/Co/Ni多层膜的铁磁共振研究
DOI：
10.1063/1.3544474
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发表时间：
2010
影响因子：
3.2
通讯作者：
E. Fullerton
中科院分区：
文献类型：
--
作者：
J;A. Kent;D. Ravelosona;I. Tudosa;E. Fullerton
我们提出了铁磁共振 (FMR) 研究，研究氦离子照射对耦合到 Co/Pd 双层的 Co/Ni 多层的磁各向异性、线宽和吉尔伯特阻尼的影响。垂直磁各向异性随 He 离子注量线性减小，导致在 5×1014 ions/cm2 的临界注量处过渡到面内磁化。我们发现阻尼几乎与注量无关，但固定频率下的 FMR 线宽在临界注量附近具有最大值，表明 FMR 线的不均匀展宽是 He 离子注量的非单调函数。基于对 FMR 线宽的角度依赖性的分析，不均匀展宽与垂直磁各向异性大小的空间变化相关。这些结果表明，离子辐照可用于系统地改变 Co/Pd/Co/Ni 多层膜的磁各向异性和磁各向异性参数的分布，以应用于...
We present a ferromagnetic resonance (FMR) study of the effect of helium ion irradiation on the magnetic anisotropy, the linewidth and the Gilbert damping of a Co/Ni multilayer coupled to Co/Pd bilayers. The perpendicular magnetic anisotropy decreases linearly with He ion fluence, leading to a transition to in-plane magnetization at a critical fluence of 5×1014 ions/cm2. We find that the damping is nearly independent of fluence but the FMR linewidth at fixed frequency has a maximum near the critical fluence, indicating that the inhomogeneous broadening of the FMR line is a nonmonotonic function of the He ion fluence. Based on an analysis of the angular dependence of the FMR linewidth, the inhomogeneous broadening is associated with spatial variations in the magnitude of the perpendicular magnetic anisotropy. These results demonstrate that ion irradiation may be used to systematically modify the magnetic anisotropy and distribution of magnetic anisotropy parameters of Co/Pd/Co/Ni multilayers for applicatio...