Fundamental limits in heat-assisted magnetic recording and methods to overcome it with exchange spring structures
Fundamental limits in heat-assisted magnetic recording and methods to overcome it with exchange spring structures
复制标题
热辅助磁记录的基本限制以及通过交换弹簧结构克服它的方法
DOI：
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发表时间：
2014
期刊：
影响因子：
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通讯作者：
L. Breth
中科院分区：
文献类型：
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作者：
D. Suess;C. Vogler;C. Abert;F. Bruckner;Roman Windl;L. Breth
研究了脉冲激光加热热辅助记录中磁性元件的开关概率。发现直径为5 nm和高度为10 nm的FePt元件在0.5T的场下显示出12%的热写入误差，这对于位图案化磁记录来说明显太大。如果施加较大的磁头磁场，则可以减少热写入误差。然而，较大的场导致基本热抖动的增加。这导致了热写入误差和基本热抖动之间的困境。通过将FePt膜的厚度增加到30 nm，可以部分地缓解这种困境。对于实际磁头场，发现基本热抖动与传统记录中的基本热抖动处于相同的数量级，约为0.5-0.8 nm。采用高居里顶层和作为硬磁存储层的FePt构成的复合结构，可以将热写入误差减小到最小。
The switching probability of magnetic elements for heat-assisted recording with pulsed laser heating was investigated. It was found that FePt elements with a diameter of 5 nm and a height of 10 nm show, at a field of 0.5 T, thermally written-in errors of 12%, which is significantly too large for bit-patterned magnetic recording. Thermally written-in errors can be decreased if larger-head fields are applied. However, larger fields lead to an increase in the fundamental thermal jitter. This leads to a dilemma between thermally written-in errors and fundamental thermal jitter. This dilemma can be partly relaxed by increasing the thickness of the FePt film up to 30 nm. For realistic head fields, it is found that the fundamental thermal jitter is in the same order of magnitude of the fundamental thermal jitter in conventional recording, which is about 0.5–0.8 nm. Composite structures consisting of high Curie top layer and FePt as a hard magnetic storage layer can reduce the thermally written-in errors to be sm...