Simulations of magnetic recording in coupled granular/continuous perpendicular media with random pinning sites
Simulations of magnetic recording in coupled granular/continuous perpendicular media with random pinning sites
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具有随机钉扎位点的耦合粒状/连续垂直介质中磁记录的模拟
DOI：
10.1109/tmag.2002.801831
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
Y. Nakamura
中科院分区：
文献类型：
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作者：
A. Goodman;S. Greaves;Y. Sonobe;H. Muraoka;Y. Nakamura
采用三维微磁模型模拟了颗粒/连续耦合（CGC）介质中的磁记录。钉扎位点通过随机各向异性常数K/sub u/引入，其遵循对数正态分布，平均值为1 /spl乘以/ 10/sup 6/（ergs/cc），标准差为/spl sigma//sub Ku/（ergs/cc）。对于范围/spl sigma//sub Ku/，我们改变连续层的厚度c和颗粒层的厚度g，同时保持恒定的介质厚度。我们分析模拟的轨道，以产生SNR数据的范围内的c和/spl sigma//sub Ku/。我们发现，增加/spl sigma//sub Ku/会降低信号并增加比特转换不规则性和噪声，然后通过增加c来通过由畴壁（DW）能量最小化驱动的机制来降低比特转换不规则性和噪声。因此，我们发现，以前的结果在一个更现实的CGC媒体模型，包含随机不规则性。为了解释所观察到的效果，我们确定了三个制度的行为，依赖于畴壁的能量相对于钉扎能量势垒所提供的颗粒层。
Magnetic recording in coupled granular/continuous (CGC) media is simulated using a three-dimensional (3-D) micromagnetic model. Pinning sites are introduced via a random anisotropy constant K/sub u/, which follows a log-normal distribution with a mean value of 1 /spl times/ 10/sup 6/ (ergs/cc) and a standard deviation /spl sigma//sub Ku/ (ergs/cc). For a range /spl sigma//sub Ku/, we vary the thickness of the continuous layer c and the thickness of the granular layer g, while maintaining a constant media thickness. We analyze simulated tracks to produce SNR data for a range of c and /spl sigma//sub Ku/. We find that increasing /spl sigma//sub Ku/ reduces signal and increases bit transition irregularity and noise, which is then reduced via a mechanism driven by domain wall (DW) energy minimization by increasing c. Thus, we find that previous results hold in a more realistic CGC media model that contains random irregularity. In order to explain the observed effects, we identify three regimes of behavior that depend on the energy of domain wall relative to the pinning energy barriers provided by the granular layer.