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Adsorbed Water Film and Heat Conduction from Disk to Slider in Heat-Assisted Magnetic Recording

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Abstract

In heat-assisted magnetic recording (HAMR), a tiny area of magnetic recording media has to be heated up to a high temperature with laser to lower the coercivity temporarily for information to be written on the area. In a humid environment, some of the water vapor molecules adsorb on the disk surface to form a water film. In HAMR writing, the adsorbed water film on the disk surface will desorb instantly from the high-temperature laser heating area to become high-temperature high-pressure water vapor. The water vapor molecules will transfer extra heat from the high-temperature laser heating area on the disk surface to the slider, which makes the temperature of the slider surface higher in a humid environment than that in dry air. The heat transfer increases dramatically with relative humidity and with the decrease in slider–disk spacing.

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Authors and Affiliations

  1. Data Storage Institute, Agency for Science, Technology and Research (A*STAR), DSI Building, 5, Engineering Drive 1, Singapore, 117608, Singapore

    Y. S. Ma, W. D. Zhou, S. K. Yu & W. Hua

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  1. Y. S. Ma
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  2. W. D. Zhou
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  3. S. K. Yu
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  4. W. Hua
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Correspondence to Y. S. Ma.

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Ma, Y.S., Zhou, W.D., Yu, S.K. et al. Adsorbed Water Film and Heat Conduction from Disk to Slider in Heat-Assisted Magnetic Recording. Tribol Lett 56, 93–99 (2014). https://doi.org/10.1007/s11249-014-0388-y

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  • DOI: https://doi.org/10.1007/s11249-014-0388-y

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