Thermally assisted magnetic recording media and magnetic...

Details Thermally assisted magnetic recording media and magnetic... Thermally assisted magnetic recording media and magnetic...

2006-07-25

2011-12-27

Bernatz, Kevin (Department: 1785)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C428S828000, C428S829000, C360S131000

Reexamination Certificate

active

08084149

ABSTRACT:
Embodiments of the invention provide a thermally assisted magnetic recording medium, which can overcome resistance against thermal fluctuation at RT and write capability, obtain a drastic temperature variation in coercive force at right below the recording temperature, and be formed at low temperature. In one embodiment, the medium has a layered structure formed of a lower high-KF ferromagnetic (F) layer formed on a substrate, satisfying TW<TC, an intermediate low-KAFantiferromagnetic (AF) layer satisfying TB<TW, and an upper ferromagnetic (F) layer for recording and reproducing, satisfying TW<TC, where TWis a recording temperature, TCis a Curie point, TNis a Neel point, TBis a blocking temperature, KFis a ferromagnetic magnetocrystalline anisotropy constant, and KAFis an antiferromagnetic magnetocrystalline anisotropy constant.

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Thiele, Jan-Ulrich et al., “FeRh/FePt Exchange Spring Films for Thermally Assisted Magnetic Recording Media”,Applied Physics Letters, vol. 82, No. 17, Apr. 28, 2003, pp. 2859-2861.

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