Patent ID: 7910233

Claim:
A magnetic recording medium for use in a thermally assisted recording system comprising at least a magnetic layer, a protective layer and a lubricant layer formed on a nonmagnetic substrate, wherein a lubricant in the lubricant layer has a heat resistance such that an amount of volatilization when the magnetic layer is heated to a temperature not lower than a temperature Tw is less than 1% with respect to an initial amount of the lubricant in an unheated condition, wherein the lubricant composing the lubricant layer is a compound represented by formula (1) and has a molecular weight in a range of 500 to 10,000 wherein “Rf” represents CF 3 CF 2 CF 2 O—(CF 2 CF 2 CF 2 O) n —CF 2 CF 2 , and “n” is a positive integer.