Anisotropy Induced Switching Field Distribution in High-Density Patterned Media

被引:1
|
作者
Talapatra, A. [1 ]
Mohanty, J. [1 ]
机构
[1] Indian Inst Technol Hyderabad, Dept Phys, Nanomagnetism & Microscopy Lab, Kandi 502285, Sangareddy, India
关键词
Switching field distribution; bit-patterned media; magnetic anisotropy; micromagnetic simulation; MAGNETIC-ANISOTROPY;
D O I
10.1142/S2010324717500059
中图分类号
O59 [应用物理学];
学科分类号
摘要
We present here micromagnetic study of variation of switching field distribution (SFD) in a high-density patterned media as a function of magnetic anisotropy of the system. We consider the manifold effect of magnetic anisotropy in terms of its magnitude, tilt in anisotropy axis and random arrangements of magnetic islands with random anisotropy values. Our calculation shows that reduction in anisotropy causes linear decrease in coercivity because the anisotropy energy tries to align the spins along a preferred crystallographic direction. Tilt in anisotropy axis results in decrease in squareness of the hysteresis loop and hence facilitates switching. Finally, the experimental challenges like lithographic distribution of magnetic islands, their orientation, creation of defects, etc. demanded the distribution of anisotropy to be random along with random repetitions. We have explained that the range of anisotropy values and the number of bits with different anisotropy play a key role over SFD, whereas the position of the bits and their repetitions do not show a considerable contribution.
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页数:8
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