Patent ID: 7468852
Filing Date: 2008-12-23
Classification: G11B

Abstract:
1. A method of fabricating a perpendicular magnetic recording medium comprising: a film forming step of forming a soft magnetic under layer, and a perpendicular magnetic recording layer on top of a substrate; and a demagnetization step of demagnetizing the perpendicular magnetic recording layer, wherein in the demagnetization step, alternating-current demagnetization is implemented by applying magnetic fields with alternate polarity in a direction slanting to an easy direction of magnetization of the perpendicular magnetic recording layer; wherein the demagnetization step utilizes first magnets having a N-pole and S-pole, as respective magnetic poles thereof, facing a medium plane, and a second magnets having a S-pole and N-pole, as respective magnetic poles thereof, facing the medium plane; wherein the S-pole and the N-pole of the second magnets, respectively, are disposed so as to have an offset in a direction either orthogonal or parallel to the medium plane, against the N-pole and the S-pole of the first magnets, respectively.