Browse Prior Art Database

Enhanced Oriented Film Disk

IP.com Disclosure Number: IPCOM000099616D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 1 page(s) / 30K

Publishing Venue

IBM

Related People

Franco, L: AUTHOR [+3]

Abstract

Disclosed is a film structure comprised of a 20 Angstrom underlayer of Co which enhances the orientation ratio (defined as ratio of residual magnetization measured in the circumferential versus radial direction) of a rare earth alloy of Co, such as SmCo, deposited onto a circumferentially textured disk.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Enhanced Oriented Film Disk

       Disclosed is a film structure comprised of a 20 Angstrom
underlayer of Co which enhances the orientation ratio (defined as
ratio of residual magnetization measured in the circumferential
versus radial direction) of a rare earth alloy of Co, such as SmCo,
deposited onto a circumferentially textured disk.

      Magnetic films of SmCo show anisotropic behavior on textured
substrates.  The anisotropy of the resulting longitudinal media is
preferentially oriented in the circumferential direction of the
texture.  Films with Co concentrations between N54 and N74 at.% have
orientation ratios of 1.5 to 2.0.  These same films with a 20
Angstrom underlayer exhibit increased orientation by as much as a
factor of 2.5.  The underlayer also improves the uniformity of
orientation around the disk.  A 100 Angstrom underlayer of Co did not
achieve these results, but instead deteriorated the magnetics
(Coercivity, Squareness, Orientation).  Materials such as Cr also
proved ineffective as an underlayer in increasing the orientation
ratio.  The enhancement in orientation of SmCo is directly correlated
to the use of a thin (20 Angstrom) underlayer film of Co.