Post treatment of perpendicular magnetic recording media.

摘要

A method of treatment of a continuous thin film magnetic medium (10) designed for perpendicular recording, comprising a substrate (12) upon which is deposited a thin magnetic layer (14) of acicular - shaped crystalline magnetic particles, with the crystallographic "c" axis of the crystal in each particle oriented parallel to the longitudinal axis of the particle acicular and the longitudinal axis of the acicular particles oriented substantially normal to the plane of said magnetic layer, the treatment effectively increasing the separation between magnetic particles and thereby increasing their coercivity while decreasing the demagnetising field of the film. The method comprises the step of utilizing enhanced grain boundary reaction at the intergranual boundary of the acicular particles by either diffusing the magnetic layer with a reagent or etching the magnetic layer with an etching agent. The magnetic layer may be initially fabricated by electrochemical plating, sputtering or vacuum deposition.