Opto-Thermal Analysis of Novel Heat Assisted Magnetic Recording Media Based on Surface Plasmon Enhancement
Opto-Thermal Analysis of Novel Heat Assisted Magnetic Recording Media Based on Surface Plasmon Enhancement
复制标题
基于表面等离子体增强的新型热辅助磁记录介质的光热分析
DOI：
10.1109/tmag.2009.2022180
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发表时间：
2009
影响因子：
2.1
通讯作者：
Young
中科院分区：
文献类型：
--
作者：
D. Lim;Min;Hyun;Young
为了了解热辅助磁记录（HAMR）应用中磁介质中局部加热的有效性，设计了一种基于金属/电介质层的新型介质结构，并对其进行了光热分析。采用时域有限差分法（FDTD）和有限体积法（FVM）研究了这种表面等离子体辅助HAMR（SPAH）介质的近场光学和热学特性。从FDTD模拟结果，证实了近场透射光从纳米狭缝孔径HAMR头强烈耦合的金属/电介质的SPAH介质的界面，激发表面等离子体波。为了比较SPAH介质和传统连续介质中产生的热量，将FDTD数据转换为坡印亭矢量来计算两种介质中的热分布。在SPAH介质中，来自磁头的45 mW的传输功率导致记录层中的温度为575 K，持续时间为2 ns，而相同条件下在连续介质中显示为429 K。由于SPAH介质的热效率比连续介质的热效率高约2倍，因此预计表面等离子体辅助的HAMR介质可以应用于未来的高密度磁记录。
Novel media structure based on metal/dielectric layer for the surface plasmon enhancement was designed and analyzed opto-thermally to understand the effectiveness of local heating in the magnetic media for heat assisted magnetic recording (HAMR) application. Near-field optical and thermal characteristics of this surface plasmon assisted HAMR (SPAH) media were studied with a nano-slit aperture of grating HAMR head using finite differential time domain (FDTD) method and finite volume method (FVM). From FDTD simulation results, it was confirmed that the near-field transmitted light from nano-slit aperture of HAMR head is coupled strongly with the metal/dielectric interface of SPAH media to excite the surface plasmon waves. To compare the generated heat in SPAH media with conventional continuous media, FDTD data were converted to the poynting vector to calculate thermal distribution in both media. The transmitted power of 45 mW from the head resulted in the temperature of 575 K in the recording layer with 2 ns duration time at the SPAH media while same condition showed 429 K at the continuous media. Since thermal efficiency of SPAH media is around 2 times better than that of continuous media, it is expected that the surface plasmon assisted HAMR media can be applied to the future high density magnetic recording.