Magnetic recording medium having a prelayer

Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier

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478 657, 478336, 478611, 478635, 478667, 478678, 478680, 478681, 478694T, 478694TM, 478694TS, 478694TP, 478900, 2041922, 427127, 427128, 427130, 427131, 427132, G11B 566

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058493867

ABSTRACT:
An improvement in a magnetic recording medium having an underlayer and a magnetic recording layer is described. The improvement, effective to reduce media anisotropy, includes deposition of a prelayer on the substrate, prior to deposition of the underlayer. The prelayer is deposited to a thickness of between 10-60 .ANG. and is composed of an CoCr-based alloy having a defined saturation magnetization.

REFERENCES:
patent: 5456978 (1995-10-01), Lal
patent: 5569533 (1996-10-01), Lal et al.
patent: 5693426 (1997-12-01), Lee
patent: 5738945 (1998-04-01), Lal
Chen, T. et al., "Isotropic vs. Oriented Thin Film Media: Choice for Future High Density Magnetic Recording," Paper #FA02 from Intermag Conference, Oct. 19-21, 1995, San Antonio, TX.
Johnson, K.E. et al., "In-Plane Anisotropy in Thin-Film Media: Physical Origins of Orientation Ratio (Invited)," Transactions on Magnetics. 31:(06) 2721-2727 (1995).
Lal, B.B. et al., "Effect of Very Thin Cr-Underlayer on the Magnetic and Recording Properties of CoCrTa Thin-Film Media," IEEE Transactions on Magnetics. 30: (06) 3954-3956 (1994).
Mirzamaani, M. et al., "Orientation Ratio of Sputtered Thin-Film Disks," J. Appl. Phys. 67: (67) 4695-4697 (1990).
Ross, C.A. et al., "The Role of Stress-Induced Anisotropy in Longitudinal Thin Film Magnetic Recording Media," J. Appl. Phys. 79: (08) 5342-5344 (1996).

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