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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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