Patent ID: 8440091
Filing Date: 2013-05-14
Classification: G11B

Abstract:
1. A method of manufacturing a magnetic recording medium, comprising: forming a ferromagnetic recording layer containing Cobalt (Co) on a substrate; forming a resist pattern on the ferromagnetic recording layer containing Co; etching an exposed portion of the ferromagnetic recording layer where a nonmagnetic layer is to be formed using the resist pattern as a mask thereby forming a recess; stripping the resist pattern and reacting the ferromagnetic recording layer in the recess with a fluorine-containing gas thereby producing a reaction product containing Co and fluorine situated on the part of the ferromagnetic recording layer in the recess; and removing the reaction product containing Co and fluorine from the part of the ferromagnetic recording layer in the recess by rinsing the magnetic recording medium with water thereby producing the nonmagnetic layer, the nonmagnetic layer, the non-magnetic layer (i) separating magnetic patterns made of the ferromagnetic recording layer containing Co and (ii) having a lower Co concentration than the magnetic patterns, wherein the concentration of Co in the nonmagnetic layer is 60% or less of that in the magnetic patterns.