MAGNETIC RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To provide a magnetic recording medium in which noise due to a magnetic domain wall can effectively reduced. SOLUTION: The magnetic recording medium includes: a substrate; a perpendicular magnetic recording layer which is formed over the substrate; a first soft magnetic underlayer which is disposed between the perpendicular magnetic recording layer and the substrate; a second soft magnetic underlayer which is disposed between the first soft magnetic underlayer and the perpendicular magnetic recording layer; and an isolation layer which is disposed between the first soft magnetic underlayer and the second soft magnetic underlayer and which prevents magnetic interaction between the first soft magnetic underlayer and the second soft magnetic underlayer, wherein an anisotropic field of the second soft magnetic underlayer is greater than an anisotropic field of the first soft magnetic underlayer. The second soft magnetic underlayer preferably has an antiferromagnetically bonded structure for increasing the anisotropic field of the second soft magnetic underlayer. A magnetic domain wall magnetic field by the magnetic domain wall of the soft magnetic underlayer is dispersed to thereby prevent the magnetic domain wall magnetic field from reaching a magnetic head, and consequently an S/N ratio is increased and recording density can be also increased. COPYRIGHT: (C)2008,JPO&INPIT