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Electroplated Cobalt Alloys As Perpendicular Media for Magnetic Storage

IP.com Disclosure Number: IPCOM000099902D
Original Publication Date: 1990-Feb-01
Included in the Prior Art Database: 2005-Mar-15
Document File: 3 page(s) / 110K

Publishing Venue

IBM

Related People

Horkans, WJ: AUTHOR [+4]

Abstract

Disclosed are electroplated Co alloys with perpendicular magnetic anisotropy and the method of producing them. These alloys can be used as magnetic storage media in the perpendicular recording mode. Although the horizontal mode is usually employed to store information in thin magnetic films, the perpendicular mode is thought to be an alternative for high-density data storage (1-3).

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Electroplated Cobalt Alloys As Perpendicular Media for Magnetic Storage

       Disclosed are electroplated Co alloys with perpendicular
magnetic anisotropy and the method of producing them.  These alloys
can be used as magnetic storage media in the perpendicular recording
mode.  Although the horizontal mode is usually employed to store
information in thin magnetic films, the perpendicular mode is thought
to be an alternative for high-density data storage (1-3).

      A variety of Co alloys with vertical anisotropy can be
sputtered.  Among the most common are CoCr and its alloys (4,5).
Electrochemical fabrication of vertical media has also been
attempted.  Media with compositions like CoNiReMnP or CoNiMnP have
been deposited electrolessly (6). Electroless deposition, being a
catalytic process, can be difficult to control, especially for
complex systems with a large number of components.  In addition,
these magnetic films typically have a horizontal anisotropy near the
substrate interface, and the transition region can be quite thick
(7).  Although electroplating is easier to control than electroless
deposition, it has not been widely used to deposit perpendicular
media.  Magnetic films that can be plated with vertical anisotropy
include Co with hydroxide inclusions (8,9) and CoPt alloys (10).

      The present invention is an electroplated CoMnP film with
vertical anisotropy.  The advantages of the invention are the good
magnetic properties, the absence of a significant transition layer at
the substrate interface, the weak dependence of film properties on
deposition conditions, and the ease of deposition and control.  A
typical solution consists of
                       CoCl2                    0.20 M
                       MnSO4                    0.02 M
                       NaCl                     0.40 M
                       H3BO3                    0.40 M
                       NaH2PO2                  0.05 M
                       Sodium lauryl sulfate    0.2g/l
                       pH                       2.5-4
                       i                        5-20 mA/cm2
                       Room temperature
                  ...