Patent ID: 8663822
Filing Date: 2014-03-04
Classification: G11B

Abstract:
1. A magnetic disk medium, comprising: a nonmagnetic substrate; a magnetic recording layer above the nonmagnetic substrate; a protective layer above the magnetic recording layer; and a lubricant layer above the protective layer, the lubricant layer comprising a mixture of a compound comprising one or more cyclophosphazene groups and a lubricant formulated as follows: wherein R1 and R2 are alkyl chains having at least two hydroxyl groups each, and m is an integer indicating a number of repeating units, wherein the lubricant layer is physically characterized as providing stable flight of a magnetic head above the lubricant layer in conditions having relative humidity of greater than about 40% as determined by a change in normalized adhesive force of less than or equal to about 20% relative to the adhesive force at 0% relative humidity when measured at 40° C.