Thin film magnetic recording disk with ruthenium-aluminum layer

Details Thin film magnetic recording disk with ruthenium-aluminum layer Thin film magnetic recording disk with ruthenium-aluminum layer

2005-01-25

2005-01-25

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

C428S690000, C428S611000, C428S668000, C428S900000, C428S336000, C427S128000, C427S131000

Reexamination Certificate

active

06846543

ABSTRACT:
A magnetic thin film disk for use in a disk drive with a ruthenium-aluminum (RuAl) seed layer with B2 structure followed by a NiAl layer is described. The disk has reduced noise and increased squareness which results in improved recording performance in a disk drive utilizing the disk. The improved disk is formed by first depositing the RuAl seed layer on the substrate then the NiAl layer is deposited onto the NiAl, followed by the other layers required for a magnetic disk such as an underlayer material with a lattice parameter compatible with RuAl such as Cr-alloy, followed by a standard hcp magnetic material. The RuAl seed layer promotes a [100] preferred orientation in the underlayer which in turn promotes a [11{overscore (2)}0] preferred orientation in the magnetic layer.

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D.E.Laughlin, et al., “The Control and Characterization of the Crystallographic Texture of Longitudinal Thin Film Recording Media”, IEEE Transactions on Magnetics, vol. 32, No. 5, 9/96, pp. 3632-3637.
L.L.Lee, et al., “Seed Layer Induced (002) Crystallographic Texture in Nial Underlayers”, J. Appl. Phys., 79(8), Apr. 15, 1996, pp. 4902-4904.

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