Thermal instability at 10 Gbit/in/sup 2/ magnetic recording
Thermal instability at 10 Gbit/in/sup 2/ magnetic recording
复制标题
DOI：
10.1109/20.334044
复制
发表时间：
1994-11
影响因子：
2.1
通讯作者：
P. Lu;S. Charap
中科院分区：
文献类型：
--
作者：
P. Lu;S. Charap
采用分子动力学和Monte Carlo计算机模拟相结合的方法，系统地研究了热稳定性对记录密度的限制。在10 Gbit/in/sup 2/磁记录的各向异性、晶粒尺寸和位长条件下，对写入的双位模拟了长达6个月的热衰减。在退磁场作用下，单层薄膜在投影晶粒尺寸上限处热效应很小，而在投影晶粒尺寸下限处热衰减明显。噪声峰值的大小没有明显变化，但噪声区域在热衰减后变宽。与总厚度相同的单层介质相比，双层介质的热衰减要严重得多，而且层间的负相互作用会使介质退磁，从而使热效应变差。多层介质中的热衰减往往会抵消通过以1000记录密度划分膜层而获得的降噪增益。静磁和交换相互作用，各向异性，和晶粒体积对热稳定性的影响进行了讨论。>
The limitation on recording density imposed by thermal stability is systematically studied by a method combining molecular dynamics and Monte Carlo computer simulations. The thermal decay for as long as 6 months has been simulated for written di-bits at the projected anisotropy, grain size, and bit length for 10 Gbit/in/sup 2/ magnetic recording. In the presence of demagnetizing field, a single layer film has little thermal effect at the upper limit of the projected grain sizes, while thermal decay is obvious when grain sizes are at the lower limit. The magnitude of the noise peak does not change significantly while the noisy region becomes wider after thermal decay. Compared with a single layer medium of the same total thickness, a double layer film has much more serious thermal decay and the negative interaction between layers tends to demagnetize the film, therefore making the thermal effect worse. The thermal decay in multilayer media tends to cancel the gain in noise reduction obtained by dividing the film layer at ultrahigh recording density. The effects of magnetostatic and exchange interaction, anisotropy, and grain volume on thermal stability are discussed. >