| 摘要 |
PROBLEM TO BE SOLVED: To provide a perpendicular magnetic recording medium whose SNR (SN ratio) is enhanced. SOLUTION: In the perpendicular magnetic recording medium having a non-magnetic substrate, a first underlayer formed on the non-magnetic substrate, a second underlayer formed on the first underlayer, a magnetic layer formed on the second underlayer and a protective layer formed on the magnetic layer, the magnetic layer is composed of an alloy having Co as a main component, the first underlayer is composed of an alloy or a compound having Ru and a metal forming a body centered cubic structure as main components and containing≥60 at.% Ru and the second underlayer is composed of Ru. COPYRIGHT: (C)2009,JPO&INPIT
|
