Experimental Study of Lubricant Depletion in Heat-Assisted Magnetic Recording: Effect of the Duration of One Laser Heating
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Heat-assisted magnetic recording (HAMR) is a technique to overcome the superparamagnetic limit and enabling large increases in the storage density of hard disk drives. The performance of lubricant on disk surface under the high temperature in the heating assisted writing process is a big concern. Laser heating in HAMR is quite different from conventional slow heating. Laser heating duration in one heating and cooling process in HAMR is as short as 1 ns. It is believed that lubricant depletion caused by the nano-second pulse laser heating in HAMR is much less severe than that caused by long time continuous laser heating. In this study, a method to compare the laser heating temperature at different laser heating conditions is developed. Lubricant depletion caused by nano-second and continuous laser heating in one heating and cooling cycle in HAMR is determined quantitatively based on test results. It is found that laser heating duration in one heating and cooling cycle in HAMR is not important to lubricant depletion. No matter laser heating is in nano-second or continuous in one heating and cooling cycle, lubricant depletion caused by the laser heating is comparable provided that the laser heating temperature is comparable.
KeywordsLubricant depletion Hard disk drive Heat-assisted magnetic recording Laser irradiation
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