Magnetic recording medium substrate and perpendicular...

Details Magnetic recording medium substrate and perpendicular... Magnetic recording medium substrate and perpendicular...

2011-06-07

2011-06-07

Bernatz, Kevin M. (Department: 1785)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C428S828000, C428S832100, C428S828100, C360S135000, C360S066000

Reexamination Certificate

active

07955723

ABSTRACT:
A perpendicular magnetic recording medium comprising a pair of soft magnetic layers that are laminated via a non-magnetic layer and antiparallel-coupled to each other and that are provided between a non-magnetic substrate and a magnetic recording layer, wherein spike noise and medium noise can be positively suppressed when information recording and reproduction are carried out at high recording surface density. At least one pair of soft magnetic layers are laid and formed via a non-magnetic layer on a substrate of a non-magnetic material so that magnetic characteristics obtained by integrating the pair of soft magnetic layers have a magnetic hysteresis to thereby prevent the formation of a magnetic domain wall.

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Reiko Arai, et al., “Suppression of Spike Noise in Anti-parallel Coupled Soft Magnetic Underlayer with Exchange Bias”, The 28thMagnetics Society of Japan, Scientific Conference Summary, 2004, pp. 612-613.

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