Nucleation and annihilation of magnetic vortices in sub-micron permalloy dots
Nucleation and annihilation of magnetic vortices in sub-micron permalloy dots
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DOI：
10.1109/20.951062
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发表时间：
2001-07-01
影响因子：
2.1
通讯作者：
Shimada, Y
中科院分区：
文献类型：
--
作者：
Novosad, V;Guslienko, KY;Shimada, Y
对Fe_（20）Ni_（80）点阵的磁化反转过程进行了实验和理论研究。利用电子束光刻技术和剥离技术制作了厚度为60 nm、直径为0.2-0.8 μ m的圆形点。由磁光磁滞回线确定了与尺寸有关的涡旋成核、湮灭和初始磁化率。随着点直径的增加，成核场和湮灭场减小，而初始磁化率呈线性增加。考虑到静磁相互作用，交换和塞曼能量的平面阵列的磁性软圆点的分析计算的结果进行了比较的实验数据。
The magnetization reversal processes in Fe20Ni80 dot arrays have been studied both experimentally and theoretically. The circular-shaped dots with thickness of 60 mn and variable diameters of 0.2-0.8 mum were fabricated by using electron-beam lithography and lift-off technique. A size dependent vortex nucleation, annihilation and initial susceptibility were determined from magneto-optical hysteresis loops. With increasing dot diameter the nucleation and annihilation fields decrease, whereas the initial susceptibility exhibits a linear increase. The experimental data were compared to the results of analytical calculations taking into account magnetostatic interactions, exchange and Zeeman energies for a planar array of magnetically soft circular dots.