Browse Prior Art Database

An Improved Nucleation Layer for CoPtCr Media

IP.com Disclosure Number: IPCOM000122759D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 1 page(s) / 54K

Publishing Venue

IBM

Related People

Ahlert, RH: AUTHOR [+2]

Abstract

Chromium nucleation layers are used to control the microstructure and micromagnetic properties of Co-alloy media. A chromium -20% Vanadium alloy film was used to improve the squareness and coercivity of Co-20%Pt media films as well as Co-14%Pt-6%Cr media. Recently, CoPtCr alloy films with high Cr concentration (>17%) have been used to improve the media noise. The formulation of new magnetic alloys with increased Cr concentration has lead to an evaluation of other Cr-V alloy concentrations. The experiments were conducted by using vacuum cast targets with alloy concentrations that range from pure Cr to pure V. The magnetic media target concentrations were Co-12Pt-13Cr, Co-9Pt-20Cr, and Co-3Pt-17Cr.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 73% of the total text.

An Improved Nucleation Layer for CoPtCr Media

      Chromium nucleation layers are used to control the
microstructure and micromagnetic properties of Co-alloy media.  A
chromium -20% Vanadium alloy film was used to improve the squareness
and coercivity of Co-20%Pt media films as well as Co-14%Pt-6%Cr
media.  Recently, CoPtCr alloy films with high Cr concentration
(>17%) have been used to improve the media noise.  The formulation of
new magnetic alloys with increased Cr concentration has lead to an
evaluation of other Cr-V alloy concentrations.  The experiments were
conducted by using vacuum cast targets with alloy concentrations that
range from pure Cr to pure V.  The magnetic media target
concentrations were Co-12Pt-13Cr, Co-9Pt-20Cr, and Co-3Pt-17Cr.  To
directly compare the effect of the underlayer concentration, the
underlayer and magnetic layer were sputtered at the same deposition
conditions (3 millitorr argon, deposition temperature of 30 degrees
Centigrade).

      Vanadium rich alloys of CrV(50-80%V) yielded between 30 and 40
percent higher coercivity values than Cr(control) for the same
thickness of underlayer and magnetic layer (500 Angstroms
underlayer/350 Angstroms magnetic layer).  The coercivity was the
lowest for the pure Cr and V underlayers and the highest for
50:50(V:Cr) and 80:20 (V:Cr).  The highest coercivities were also
observed for the 50:50 and 80:20 (V:Cr) underlay films when the
thickness of the magnetic layer was fixed at 350 Angs...