Nucleation and wall motion in graded media
Nucleation and wall motion in graded media
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DOI：
10.1063/1.2835483
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发表时间：
2008-03
影响因子：
3.2
通讯作者：
R. Skomski;Thomas George;D. Sellmyer
中科院分区：
文献类型：
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作者：
R. Skomski;Thomas George;D. Sellmyer
通过模型计算研究了梯度磁记录介质中的磁化反转及其对磁记录面密度的影响。通过选择合适的固溶体材料，实现任意低的写入场在概念上是简单的，但在实践中具有挑战性。写入过程涉及反向畴的成核和它们沿伸长颗粒的沿着传播。介质的性能针对尺寸相当的钉扎和成核场进行优化，并且可以通过调整细长颗粒（柱）的长度以及硬端和软端的各向异性来调谐这两个场。然而，写字段的减少负面影响面密度，并且仍然存在写字段和位大小之间的权衡。
Magnetization reversal in graded magnetic-recording media and its effect on the areal density are investigated by model calculations. By choosing suitable solid-solution materials it is conceptually straightforward, though practically challenging, to achieve arbitrarily low write fields. The writing process involves both the nucleation of reverse domains and their propagation along elongated particles. The performance of the medium is optimized for pinning and nucleation fields of comparable size, and the two fields can be tuned by adjusting the length of the elongated particles (pillars) and the anisotropies of the hard and soft ends. However, the write-field reduction negatively affects the areal density, and there remains a trade-off between write field and bit size.