A Micromagnetic Study of the Effect of Spatial Variations in Damping in Perpendicular Recording Heads
A Micromagnetic Study of the Effect of Spatial Variations in Damping in Perpendicular Recording Heads
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垂直记录磁头阻尼空间变化影响的微磁研究
DOI：
10.1109/tmag.2006.879430
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发表时间：
2006
影响因子：
2.1
通讯作者：
J. Bain
中科院分区：
文献类型：
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作者：
A. Kaya;M. Benakli;M. Mallary;J. Bain
我们使用微磁建模来研究旋磁阻尼常数 α 对垂直写入头动力学的影响。考虑磁头不同区域具有不同 alpha 值的情况，以检查增加阻尼可能在磁头场上升时间方面带来的好处。研究发现，在驱动频率为 1 Gb/s 时，将极区的 α 从 0.02 增加到 0.2 可以显着改善场上升时间和幅度。磁轭区域和软衬层 (SUL) 阻尼的类似增加并没有产生场强度或上升时间的显着改善，但与 SUL 噪声的降低有关。还值得注意的是，对于单极头设计，与屏蔽极头相比，需要具有更高磁化厚度积 MSt 的 SUL 才能实现所需的磁场幅度。观察到屏蔽头设计的场梯度有所改善，同时场强度有所降低
We have used micromagnetic modeling to study the effect of the gyromagnetic damping constant, alpha, on the dynamics of a perpendicular write head. Cases are considered where different regions of the head have different values of alpha, to examine where increased damping might offer benefits in head field rise time. It is found that increasing alpha in the pole region from 0.02 to 0.2 significantly improves both field rise time and amplitude at a drive frequency of 1 Gb/s. Similar increases in the damping of the yoke region and in the soft underlayer (SUL) did not yield nearly as significant improvements in field magnitudes or rise times, but was associated with reduced noise from the SUL. It is also noted for a monopole head design, that a SUL with higher magnetization-thickness product, MSt, is needed to achieve the desired field amplitude as compared to a shielded pole head. An improvement in the gradient of the field is observed for the shielded head design along with a reduction in the field magnitude