Perpendicular magnetic recording medium, method of...

Details Perpendicular magnetic recording medium, method of... Perpendicular magnetic recording medium, method of...

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.

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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).

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