AG ALLOY THERMAL DIFFUSION CONTROL FILM USED IN MAGNETIC RECORDING MEDIUM FOR THERMALLY ASSISTED RECORDING, MAGNETIC RECORDING MEDIUM FOR THERMALLY ASSISTED RECORDING, AND SPUTTERING TARGET

摘要

Disclosed is a thermal diffusion control film to be used in a magnetic medium for thermally assisted recording, said thermal diffusion control film maintaining a high heat conductivity, and at the same time, having all of a high thermal diffusivity, a smooth surface roughness, and a high heat resistance.The thermal diffusion control film, i.e., an Ag alloy thermal diffusion control film, is composed of an Ag alloy having Ag as a main component, and satisfies a surface roughness (Ra) of 1.0 nm or less, a heat conductivity of 100W/(m∙K) or more, and a thermal diffusivity of 4.0×10^-5m²/sec or more.