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(111)-Textured Alloys of Co and Noble Metals as Perpendicular and Magneto-Optical Recording Medium

IP.com Disclosure Number: IPCOM000108003D
Original Publication Date: 1992-Apr-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 1 page(s) / 35K

Publishing Venue

IBM

Related People

Gorman, G: AUTHOR [+2]

Abstract

Disclosed are (111)-textured thin film alloys of Co and noble metals (e.g., Pt, Pd, Au ...) which are vertically magnetized and to be used as recording media in perpendicular magnetic recording and magneto- optical recording.

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(111)-Textured Alloys of Co and Noble Metals as Perpendicular and Magneto-Optical Recording Medium

       Disclosed are (111)-textured thin film alloys of Co and
noble metals (e.g., Pt, Pd, Au ...) which are vertically magnetized
and to be used as recording media in perpendicular magnetic recording
and magneto- optical recording.

      Multilayers of ultra-thin Co and noble metals (such as Pt, Pd,
Au ...)  have been previously (1,2) disclosed to have perpendicular
magnetic anisotropy and have been proposed as recording medium for
the perpendicular and magneto-optic recording. The typical thickness
of the Co layer is about 0.2-0.4 nm, and that of the Pt layer is
about 1-2 nm. To stack Co and Pt layers of such small thickness for
10-30 periods in the manufacturing process is quite a challenge.
Alloy films of Co and noble metals (Pt, Pd, Au ...) disclosed here
with good perpendicular magnetic anisotropy are much easier to
manufacture.

      By growing the alloy films with the (111) lattice plane
parallel to the film surface, strong perpendicular magnetic
anisotropy and square perpendicular hysteresis loop are obtained.
These alloys are therefore suitable for perpendicular and
magneto-optic recording applications. Typical processing techniques
to obtain the desired crystallographic orientation of these alloys
are elevated substrate temperature, seeding underlayer, etc.

      References
(1)  European Patent 0,304,873.
(2)  European Patent 0,304,927.