用于热辅助磁记录的 3 层交换耦合复合介质

IF 2.1 3区 工程技术 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC
Yijia Liu;R. H. Victora
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引用次数: 0

摘要

本文提出了一种新型三层热交换耦合复合材料(3ly-ECC)介质,用于在降低工作温度的条件下减轻与热辅助磁记录(HAMR)相关的噪声,尤其是过渡噪声。利用泽曼效应和各向异性场梯度分别切换写入层和中间层,与总厚度相同的 2ly-ECC 相比,在没有晶间交换(IGE)的情况下,所提出的 3ly-ECC 有效地将过渡抖动降低了约 15%,误码率(BER)降低了约 85%。使用简单自旋模型对能量函数进行的分析支持了过渡抖动的改善,该分析强调了中间层的大各向异性和小磁化的贡献。不过,与 2ly-ECC 相比,3ly-ECC 更容易受到写入后擦除(EAW)效应的影响。计算表明,增加写入层的各向异性可以抑制 3ly-ECC 中的 EAW 效应,但由于失去了快速切换功能,会对误码率产生不利影响。总之,所提出的 3ly-ECC 有效地平衡了快速切换和 EAW,与双层对应器件相比,抖动和误码率都更出色。研究结果表明,未来的工作重点是开发合适的高 Ku 和低 Ms 复合介质,以提高 HAMR 器件的磁场密度 (AD)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Three-Layer Exchange Coupled Composite Media for Heat-Assisted Magnetic Recording
A novel three-layer thermally exchange coupled composite (3ly-ECC) media is proposed to mitigate heat-assisted magnetic recording (HAMR)-related noise at reduced operating temperature, particularly transition noise. Leveraging the Zeeman effect and anisotropy field gradients to switch the writing layer and the middle layer, respectively, the proposed 3ly-ECCs effectively reduce transition jitter by ~15% and bit error rate (BER) by ~85% in the absence of intergranular exchange (IGE), compared with the 2ly-ECC with the same total thickness. The improvement in transition jitter is supported by an analytical analysis of the energy function using a simple spin model, which highlights the contribution of large anisotropy and small magnetization in the middle layer. However, it is noted that the 3ly-ECC is more susceptible to erasure-after-write (EAW) effect than 2ly-ECC. Calculations reveal that increasing the anisotropy of writing layer suppresses the EAW effect in 3ly-ECCs, yet adversely affects BER due to the loss of rapid switching. Overall, the proposed 3ly-ECC effectively balances fast switching and EAW to yield superior jitter and BER compared with the two-layer counterpart. The results suggest that future endeavors could focus on developing suitable high-Ku and low-Ms composite media to potentially improve the areal density (AD) of HAMR device.
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来源期刊
IEEE Transactions on Magnetics
IEEE Transactions on Magnetics 工程技术-工程:电子与电气
CiteScore
4.00
自引率
14.30%
发文量
565
审稿时长
4.1 months
期刊介绍: Science and technology related to the basic physics and engineering of magnetism, magnetic materials, applied magnetics, magnetic devices, and magnetic data storage. The IEEE Transactions on Magnetics publishes scholarly articles of archival value as well as tutorial expositions and critical reviews of classical subjects and topics of current interest.
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