PERPENDICULAR MAGNETIC RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a perpendicular magnetic recording medium having improved SNR. SOLUTION: The perpendicular magnetic recording medium has a perpendicular magnetic recording layer provided on a substrate and a soft magnetic underlayer formed between the substrate and the perpendicular magnetic recording layer. The soft magnetic underlayer includes a plurality of soft magnetic underlayers having different saturation magnetizations and at least one of the soft magnetic underlayers has an easy axis of magnetization in a radial direction. COPYRIGHT: (C)2008,JPO&INPIT