Grain isolated multilayer perpendicular recording medium

Details Grain isolated multilayer perpendicular recording medium Grain isolated multilayer perpendicular recording medium

1996-02-26

1998-11-10

Resan, Stevan A.

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428216, 428336, 428611, 428615, 428668, 428670, 428694TS, 428694TM, 428900, 428928, G11B 566

Patent

active

058340858

ABSTRACT:
A new type of multilayer structure is shown which has superior properties for retaining magnetic transitions on a surface as they are written by a recording transducer. The multilayer is composed of crystal grains which are electronically isolated from one another (exchange isolated). The exchange isolation of the grains creates a type of medium which can viably store data at more than 2 billions bits per square inch. A method is described for making such a structure and the storage of magnetic transitions at extremely high density is demonstrated. Recording with previous multilayer candidates is also shown for comparison purposes.

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D. J. Rogers et al., Investigations of Compositional Separation in C0-Cr Thin Film Recording Media, Journal of Magnetism and Magnetic Materials, 130 Jan. (1994), pp. 433-441.
Bruce M. Lairson et al., Application of Pd/Co Multilayers for Perpendicular Magnetic Recording, Applied Physics Letters, 64 (21), May 23, 1994, pp. 2891-2893.

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