Advantage of MAMR Read-Write Performance
Advantage of MAMR Read-Write Performance
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DOI：
10.1109/tmag.2016.2569524
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发表时间：
2016-09-01
影响因子：
2.1
通讯作者：
Aoyama, Jun
中科院分区：
文献类型：
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作者：
Tagawa, Ikuya;Shiimoto, Masato;Aoyama, Jun
微波辅助磁记录 (MAMR) 是下一代硬盘驱动器最有前途的候选技术之一。在 MAMR 中，记录头中的自旋扭矩振荡器 (STO) 产生的高频场用于减少介质的磁化切换场。微磁模型显示了 MAMR 的潜力；然而，就实际磁头和介质的实验结果而言，仅报道了很少的介质磁化反转和重写改进的证据。在本文中，我们重点关注 MAMR 增益的实验结果，MAMR 增益定义为 STO 激活时与未激活时读写性能的差异。总之，我们通过激活 STO 显示了明显的误码率改善，在考虑与磁芯宽度增加相关的损失后，面密度增加了约 5-10%。我们还确认，STO 中的磁化切换足够快，高达 2.3 GHz，并且对相邻磁道干扰和远磁道干扰都没有负面影响。
Microwave-assisted magnetic recording (MAMR) is one of the promising candidate technologies for next-generation hard disk drives. In MAMR, the high-frequency field from a spin-torque oscillator (STO) in the recording head is utilized to reduce the magnetization switching field of the medium. Micromagnetic modeling has shown the potential of MAMR; however, in terms of experimental results with actual heads and media, only little evidence of media magnetization reversal and improvement on overwrite has been reported. In this paper, we focus upon the experimental results of MAMR gain defined as a difference in the read-write performance when the STO is activated compared with when not activated. In conclusion, we show clear bit error rate improvement by activating the STO, giving an areal density increase of around 5-10% after considering the penalty associated with the magnetic core width increase. We also confirm that the magnetization switching in the STO is fast enough up to 2.3 GHz, and that there is no negative impact on the adjacent track interference nor on the far track interference.