Thermal Effects in Heat Assisted Bit Patterned Media Recording
Thermal Effects in Heat Assisted Bit Patterned Media Recording
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热辅助位图媒体记录中的热效应
DOI：
10.1109/tmag.2009.2016466
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发表时间：
2009
影响因子：
2.1
通讯作者：
T. Chong
中科院分区：
文献类型：
--
作者：
Baoxi Xu;Jiaping Yang;H. Yuan;Jun Zhang;Qide Zhang;T. Chong
要达到10Tb/in2的记录密度是磁记录的一大挑战。已经提出了两种有前景的技术来实现超过1Tb/in2的密度：热辅助磁记录和位图案化介质。由于最小介质颗粒尺寸的限制或更高写入磁场的要求，这两种技术的密度仍被限制在5Tb/in2以下。需要新技术来推动密度达到5TB/in2甚至更高。热辅助位图案化介质记录是实现这一目标的一个很好的候选者。本文通过数值模拟研究了密度为5~10Tb/in2的BIT图案化介质的热效应。结果表明，具有软底层的介质在5Tb/in2的速率下具有约0.15 nm的位标记垂直扩展，在磁写极与记录层之间的间距小于3 nm的情况下，这可能会引起记录性能的变化。为了获得小于1 ns的冷却速度，提出了一种脉冲加热方法。采用这种方法，在bar=1的情况下冷却速度得到了极大的提高。大棒介质的热性能较差。
It is a big challenge to achieve recording density of 10 Tb/in2 for magnetic recording. Two promising technologies have been proposed for achieving density beyond 1 Tb/in2: heat assisted magnetic recording and bit patterned media. Owing to limitation of minimum media grain size or requirement of higher writing magnetic field, the densities of both technologies are still limited at below 5 Tb/in2. There is a need for new technology to push the density towards 5 Tb/in2 and beyond. Heat assisted bit patterned media recording is a good candidate to achieve this target. In this paper, thermal effects on bit patterned media at densities from 5 to 10 Tb/in2 are studied by numerical simulations. The results show that the media with soft under layer has bit mark vertical expansion of around 0.15 nm at 5 Tb/in2, which may cause recording performance change in the case of less than 3 nm space between magnetic write pole and recording layer. In order to obtain less than 1 ns cooling speed, a pulse heating method is proposed. With this method, the cooling speed gets tremendous improvement at BAR = 1 . Media with large BAR has worse thermal performances.