Observations of Depth-Sensing Reciprocating Scratch Tests of DLC and Nitrogenated-DLC Overcoats on Magnetic Disks

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The characterization of ultrathin tribologically hard protective overcoats is an important concern for the future requirements in magnetic disk drives. Increasing the areal recording density dictates the need for thinner protective overcoats (=5 nm thick), which must possess high wear resistance, low friction coefficient, low surface roughness, and adherence to the magnetic media. These properties are crucial since near contact (