Local modes and two magnon scattering in ordered permalloy antidot arrays
Local modes and two magnon scattering in ordered permalloy antidot arrays
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DOI：
10.1063/1.3076144
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发表时间：
2009-04-01
影响因子：
3.2
通讯作者：
Goerlitz, Detlef
中科院分区：
文献类型：
--
作者：
Martens, Stephan;Albrecht, Ole;Goerlitz, Detlef
在连续磁性薄膜中由周期性排列的孔组成的反点阵列具有周期性的退磁场分布，这对磁性薄膜的结构和性能（如增强的矫顽力）有很大的影响。报道了在多孔阳极氧化铝基底上气相沉积20 nm坡莫合金制备的周期为180 nm、反点直径为70 nm的有序正方形反点阵列的静态和动力学研究。使用超导量子干涉装置的磁强计，磁光克尔效应测量和角度可变铁磁共振（FMR）光谱在9.2 GHz，连同微磁学模拟几个局部磁化模式，被确定。随着磁场面外角的增加，FMR线宽的增加不仅是由于退磁效应，而是由于两个磁振子散射过程。假设该特征源自通过原子力显微镜量化的氧化铝衬底的表面粗糙度[w（rms）（L=1.3 μ m）类似于5 nm]。(C)2009年美国物理学会。[DOI：10.1063/1.3076144]
Antidot arrays consisting of periodically arranged holes in continuous magnetic films exhibit periodic demagnetization field distributions, which have large impact on the magnetic structure and properties such as enhanced coercivity. The authors report on the investigation of the statics and the dynamics of ordered square antidot arrays with 180 nm period and 70 nm antidot diameter that have been prepared by vapor deposition of 20 nm Permalloy on porous anodic alumina substrates. Using superconducting quantum interference device magnetometry, magneto-optical Kerr effect measurements and angular variable ferromagnetic resonance (FMR) spectroscopy at 9.2 GHz, together with micromagnetic simulations several local magnetization modes, were identified. The enhanced FMR linewidth with increasing out-of-plane angle of the magnetic field is not due only to demagnetization effects, but is rather attributed to two magnon scattering processes. This feature is assumed to originate from the surface roughness [w(rms)(L=1.3 mu m) similar to 5 nm] of the alumina substrate which is quantified by atomic force microscopy. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3076144]