The thermodynamic limits of magnetic recording
The thermodynamic limits of magnetic recording
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磁记录的热力学极限
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
R. Chantrell
中科院分区：
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作者：
H. Richter;A. Lyberatos;U. Nowak;R. Evans;R. Chantrell
在磁记录中，被记录信息的热稳定性通常被认为决定了最大可能密度的极限。结果表明，基本热力学总是导致写入过程成功的概率小于100%。这将导致热诱导错误率，最终限制最大可能密度超出传统热稳定性极限。对于记录简单的单畴粒子，热诱导错误率可以忽略不计，但在写入辅助的情况下，它会迅速增加，特别是如果写入辅助是通过增加记录温度来完成的。对于将热辅助写入与每比特使用一粒的记录方案相结合的最终记录系统，对于误码率目标为10−2的最大可实现密度的上限为20 Tbit/inch2。
Thermal stability of the recorded information is generally thought to set the limit of the maximum possible density in magnetic recording. It is shown that basic thermodynamics always cause the probability of success of the write process to be less than 100%. This leads to a thermally induced error rate, which eventually limits the maximum possible density beyond that given by the traditional thermal stability limit. While the thermally induced error rate is negligible for recording of simple single domain particles, it rapidly increases in the presence of a write assist, in particular if the write assist is accomplished by an increased recording temperature. For the ultimate recording system that combines thermally assisted writing with a recording scheme that uses one grain per bit, the upper bound for the maximum achievable density is 20 Tbit/inch2 for a bit error rate target of 10−2.