Micromagnetic simulation of magnetic cluster, thermal activation volume, and medium noise in perpendicular recording media
Micromagnetic simulation of magnetic cluster, thermal activation volume, and medium noise in perpendicular recording media
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DOI：
10.1109/tmag.2003.813782
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发表时间：
2003-07-01
影响因子：
2.1
通讯作者：
Sugita, Y
中科院分区：
文献类型：
--
作者：
Igarashi, M;Hara, M;Sugita, Y
通过微磁模拟研究了垂直记录介质中磁簇的形成过程，并与纵向记录介质的数据进行了比较。由直流反向场退磁状态的自相关长度得到的磁簇尺寸与写入状态几乎相同。它随着晶间交换耦合的增加而增加，并且与簇形成过程无关。此外，发现热开关单元尺寸（激活体积）小于磁簇尺寸。它几乎保持与晶粒尺寸相同，直到交换耦合达到临界值，并进一步增加。过渡噪声是介质噪声的主要部分，随着磁簇尺寸的增加而增加。
The process of the, formation of magnetic clusters in perpendicular recording media was investigated through micromagnetic simulation and compared with data for longitudinal recording media. The size of magnetic clusters, which is obtained from the autocorrelation length of demagnetized state by dc reverse field, was almost the same as that for written states. It increased with increasing intergrain exchange coupling and was independent of the process of cluster formation. Also, the thermal switching unit size (activation volume) was found to be smaller than the magnetic cluster size. It remained almost the same as the grain size until the exchange coupling reached a critical value, and increased further. The transition noise, the main part of the medium noise, increased with increasing the magnetic cluster size.