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首页> 外文期刊>IEEE Transactions on Magnetics >Understanding Disk Carbon Loss Kinetics for Heat Assisted Magnetic Recording
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Understanding Disk Carbon Loss Kinetics for Heat Assisted Magnetic Recording

机译：了解热辅助磁记录的磁盘碳损失动力学

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An optical pump-probe set-up that allowed short dwell time ( ~ 500 μs) heating with a high-temperature ramp rate ( ~ 106 K/s) was used to detect the magnetization change in heat assisted magnetic recording (HAMR) media. The temperature of the media was monitored by observing the Kerr signal. The pump power at zero magnetization allowed the determination of the power needed to attain the Curie temperature of the media (the Curie temperature was determined with a high-temperature magnetometer before the pump-probe experiments). HAMR media was then irradiated with a pump power to obtain 480°C for increasing exposure times. Atomic force microscopy (AFM) of these media surfaces revealed depressions or holes in the media surface [within the carbon overcoat (COC) layer] that increased in extent with cumulative exposure time. Media surfaces exposed to somewhat lower temperatures (450°C) and for shorter times had a swollen region that surrounded a much smaller depression. High-spatial resolution Raman spectroscopy was used to analyze these irradiated areas. An increased D-band was observed within the swollen portion of the media surface, while the overall Raman signal intensity decreased within the small depressed area. Using time and temperature irradiations along with AFM analysis of the depressions the activation energy for COC loss was determined to be 0.6 eV. These observations were attributed to COC failure through graphitization and oxidation. The failure mechanism leading to these observed changes and the possible relationship of the present results to the HAMR media COC thermal stability are discussed.
机译：使用光泵探针装置以短的停留时间（〜500μs）以高温斜率（〜10 6 K / s）进行加热，以检测热量的磁化变化辅助磁记录（HAMR）媒体。通过观察克尔信号监测介质的温度。零磁化强度下的泵浦功率可以确定达到介质居里温度所需的功率（居里温度是在泵浦探头实验之前用高温磁力计确定的）。然后用泵浦功率对HAMR介质进行辐照，以获得480°C，以延长曝光时间。这些介质表面的原子力显微镜（AFM）显示，介质表面[在碳外涂层（COC）层内）的凹陷或孔随着累积曝光时间的增加而增加。暴露于较低温度（450°C）且时间较短的介质表面有一个肿胀区域，包围着一个很小的凹陷。使用高空间分辨率拉曼光谱分析这些照射区域。在介质表面的肿胀部分观察到D带增加，而在较小的凹陷区域内，整个拉曼信号强度下降。使用时间和温度辐射以及对凹陷的AFM分析，确定COC损失的活化能为0.6 eV。这些观察结果归因于通过石墨化和氧化作用导致的COC失效。讨论了导致这些观察到的变化的失效机理，以及当前结果与HAMR介质COC热稳定性的可能关系。

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