Field evolution of magnetic vortex state in ferromagnetic disks
Field evolution of magnetic vortex state in ferromagnetic disks
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DOI：
10.1063/1.1377850
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发表时间：
2001-06-11
影响因子：
4
通讯作者：
Fukamichi, K
中科院分区：
文献类型：
--
作者：
Guslienko, KY;Novosad, V;Fukamichi, K
研究了亚微米铁磁磁盘中磁“涡旋态”的演化随直径和厚度的变化。通过最小化由静磁能、交换能和塞曼能组成的总磁能，计算了外加磁场中的涡核位移。导出了初始磁化率的简单解析表达式。初始磁化率随圆盘直径的增大和厚度的减小而增大。计算结果与60 nm厚的变径0.2~0.8微米坡莫合金圆盘阵列的实验数据符合得很好。(C)2001年美国物理研究所。
The evolution of a magnetic "vortex" state in submicron ferromagnetic disks has been studied as functions of disk diameter and thickness. The vortex core displacement in the applied magnetic field was calculated by minimizing the total magnetic energy consisting of the magnetostatic, exchange, and Zeeman energies. A simple analytical expression fur the initial magnetic susceptibility is deduced. The initial susceptibility increases with increasing disk diameter and decreasing thickness. The calculations agree well with the experimental data obtained fur the 60 nm thick permalloy disk arrays with a variable diameter from 0.2 to 0.8 mum. (C) 2001 American Institute of Physics.