Hybrid anti-ferromagnetically coupled and laminated magnetic...

Details Hybrid anti-ferromagnetically coupled and laminated magnetic... Hybrid anti-ferromagnetically coupled and laminated magnetic...

2005-02-08

2005-02-08

Bernatz, Kevin M. (Department: 1773)

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

C428S637000, C428S667000, C428S668000, C428S675000, C428S678000, C428S215000, C428S216000, C428S336000, C428S690000, C428S690000

Reexamination Certificate

active

06852426

ABSTRACT:
A high areal recording density longitudinal magnetic recording medium having improved thermal stability and signal-to-medium noise ratio (“SMNR”), comprises:(a) a non-magnetic substrate having at least one surface; and(b) a layer stack overlying the at least one surface, comprising a plurality of vertically spaced-apart ferromagnetic layers, each vertically adjacent pair of ferromagnetic layers being spaced-apart by a respective non-magnetic spacer layer, wherein:(i) at least one of the plurality of vertically adjacent, spaced-apart pairs of ferromagnetic layers forms an anti-ferromagnetically coupled media (“AFC”) component of the magnetic recording medium; and(ii) at least one of the plurality of vertically adjacent, spaced-apart pairs of ferromagnetic layers forms a laminated media (“LM”) component of the magnetic recording medium.

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Abarra, E., Inomata , A., Sato, H., Okamoto, I., and Y. Mizoshita (App. Phys. Let., 77(16), 2000, 2581-2583).

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