LUBRICANT FOR MAGNETIC RECORDING MEDIUM, MAGNETIC RECORDING MEDIUM, AND MAGNETIC RECORDING APPARATUS

PROBLEM TO BE SOLVED: To obtain a lubricant which prevents the discharge breakdown of a head element of a hard disk apparatus of a floating or contact type using a medium comprising a nonconductive substrate (e.g. glass) by compounding a perfluoropolyether compd. with a specified amt. of a compd. having a higher electrical conductivity.

SOLUTION: A perfluoropolyether compd. is compounded with 0.1-99.9 wt.% compd. having electrical conductivity higher than the perfluoropolyether compd. Examples of such a compd. are ones having backbones represented by formula I, formula II (wherein R¹ and R² are each H, OH, a halogen, sulfo, carboxyl, nitro, amino, alkyl, or aryl; and R³ is an alkyl or aryl), and formula III [wherein R¹ to R⁴ are each H, OH, a halogen, sulfo, carboxyl, nitro, amino, alkyl, or aryl; and H⁺ and A^- are a proton and a conjugate base, respectively, of a protonic acid (the protonic acid is a sulfonic acid, a carboxylic acid, hydrofluoric acid, hydrochloric acid, hydrobromic acid, hydroiodic acid, nitric acid, nitrous acid, sulfuric acid, or sulfurous acid)].

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