Dynamic magnetic information storage or retrieval – Checking record characteristics or modifying recording...
Reexamination Certificate
2007-03-06
2008-11-25
Sniezek, Andrew L. (Department: 2627)
Dynamic magnetic information storage or retrieval
Checking record characteristics or modifying recording...
C360S135000, C428S831000
Reexamination Certificate
active
07457064
ABSTRACT:
Embodiments in accordance with the present invention provide a perpendicular magnetic recording medium which is easy to record, offers superior thermal stability of recording magnetization, and allows high-density recording. In one embodiment, a perpendicular magnetic layer with controlled magnetic properties is used as a magnetic storage layer of a perpendicular magnetic recording medium, the magnetic properties having been controlled such that an indicator σhsw[%] of the dispersion of magnetization switching fields in the perpendicular magnetic layer and an indicator Dn[nm] of the intensity of exchange interactions, in film surface directions, in the perpendicular magnetic layer satisfy inequalities σhsw/27+Dn/90<1, and Dn>20. The indicators can be measured using a magnetometer.
REFERENCES:
patent: 6747830 (2004-06-01), Yano
patent: 6844605 (2005-01-01), Nishimura
patent: 7203607 (2007-04-01), Olson
patent: 7339764 (2008-03-01), Honda et al.
patent: 2006/0146445 (2006-07-01), Nolan et al.
patent: 2006/0177703 (2006-08-01), Takenoiri et al.
patent: 2006/0269797 (2006-11-01), Lu et al.
patent: 2002-197636 (2002-07-01), None
patent: 2005-251264 (2005-09-01), None
Oikawa et al., “High Performance CoPtCrO Single Layered Perpendicular Media with No Recording Demagnetization,”IEEE Transactions on Magnetics, vol. 36, No. 5, pp. 2393-2395 (Sep. 2000).
Oikawa et al., “Microstructure and Magnetic Properties of CoPtCr-SiO2Perpendicular Recording Media,”IEEE Transactions on MagNETICS, vol. 38, No. 5, pp. 1976-1978 (Sep. 2000).
Hosoe Yuzuru
Nemoto Hiroaki
Takekuma Ikuko
Gold Darren
Habermehl James L
Hitachi Global Storage Technologies - Netherlands B.V.
Sniezek Andrew L.
Townsend and Townsend / and Crew LLP
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