Noise Reduction Based on an Fe -Rh Interlayer in Exchange-Coupled Heat-Assisted Recording Media
Noise Reduction Based on an Fe -Rh Interlayer in Exchange-Coupled Heat-Assisted Recording Media
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交换耦合热辅助记录介质中基于 Fe-Rh 中间层的降噪
DOI：
10.1103/physrevapplied.8.054021
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发表时间：
2017
影响因子：
4.6
通讯作者：
D. Suess
中科院分区：
文献类型：
--
作者：
C. Vogler;C. Abert;F. Bruckner;D. Suess
高存储密度和高数据速率是现代硬盘驱动器最需要的两个属性。热辅助磁记录（HAMR）被认为可以实现这两个目标。记录介质，交换耦合的颗粒组成的高和低的部分，被证明具有低直流噪声，但增加交流噪声相比，硬磁单相颗粒，如FePt。我们广泛地研究了中间层对交换耦合晶粒中磁噪声的影响。我们找到了一个最佳的晶粒设计，减少抖动在下行轨道方向上的高达30%，并在偏离轨道方向上的高达50%，这取决于头的速度，相比，相同的结构，没有FeRh。此外，造成这种抖动减少的机制被证明。此外，我们表明，对于短的热脉冲和低的写入温度，所分析的晶粒结构的开关时间分布减少了4倍，相比相同的结构，没有anlayer。这一特点可能是有趣的HAMR使用脉冲激光光斑，并鼓励讨论这种HAMR技术。
High storage density and high data rate are two of the most desired properties of modern hard disk drives. Heat-assisted magnetic recording (HAMR) is believed to achieve both. Recording media, consisting of exchange-coupled grains with a high and a lowpart, were shown to have low dc noise—but increased ac noise—compared to hard magnetic single-phase grains like FePt. We extensively investigate the influence of aninterlayer on the magnetic noise in exchange-coupled grains. We find an optimal grain design that reduces the jitter in the down-track direction by up to 30% and in the off-track direction by up to 50%, depending on the head velocity, compared to the same structures without FeRh. Furthermore, the mechanisms causing this jitter reduction are demonstrated. Additionally, we show that, for short heat pulses and low write temperatures, the switching-time distribution of the analyzed grain structure is reduced by a factor of 4 compared to the same structure without anlayer. This feature could be interesting for HAMR use with a pulsed laser spot and could encourage discussion of this HAMR technique.