Micromagnetic calculation for superlattice magnetic recording media
Micromagnetic calculation for superlattice magnetic recording media
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DOI：
10.1063/1.372706
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发表时间：
2000-04
影响因子：
3.2
通讯作者：
Jianhua Xue;R. Victora
中科院分区：
文献类型：
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作者：
Jianhua Xue;R. Victora
建立了一个具有真实晶粒结构（平面Voronoi单元）的微磁模型来模拟垂直磁记录介质。该模型适用于实验的Co/Pd超晶格薄膜。计算的垂直磁滞回线具有6560 Oe的矫顽力，与实验值近似一致。结果表明，对于理想取向的材料，初始开关场与晶粒尺寸的均匀性有很大关系，但初始开关场与晶粒尺寸的不均匀性有很大关系。特别是，均匀晶粒的假设在滞后回线中产生膝关节，这在更现实的Voronoi晶粒或实验中没有发现。
A micromagnetic model with realistic grain configuration (planar Voronoi cells) is developed to simulate perpendicular magnetic recording media. The model is applied to an experimental Co/Pd superlattice film. The calculated perpendicular hysteresis loop exhibits a coercivity of 6560 Oe, in approximate agreement with the experimental value. It is found that the coercivity is largely invariant to grain irregularity, but the initial switching field depends greatly on grain size uniformity for ideally oriented material. In particular, an assumption of uniform grains produces a knee in the hysteresis loop that is not found with the more realistic Voronoi grains or in experiment.