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Fabrication of High Kerr Rotation Media

IP.com Disclosure Number: IPCOM000102779D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-17
Document File: 1 page(s) / 43K

Publishing Venue

IBM

Related People

Notarys, H: AUTHOR [+4]

Abstract

Disclosed is an approach to produce high magneto-optic Kerr activity materials by using multi-layered films. This approach involves the utilization of large Kerr rotation of transition metal films coupled with high perpendicular magnetic anisotropy films. The optimization of the transition metal film-thickness permits the establishment of the exchange coupled state and the enhancement of Kerr rotation.

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Fabrication of High Kerr Rotation Media

      Disclosed is an approach to produce high magneto-optic Kerr
activity materials by using multi-layered films.  This approach
involves the utilization of large Kerr rotation of transition metal
films coupled with high perpendicular magnetic anisotropy films.  The
optimization of the transition metal film-thickness permits the
establishment of the exchange coupled state and the enhancement of
Kerr rotation.

      One example presented here is the case of Co/TbFeCo films (Fig.
1).  The Kerr rotation at the wavelength of 630nm is plotted as a
function of film-thickness of Co layer evaporate onto 500A thick
TbFeCo films.  This result clearly demonstrates that the Kerr
rotation increases by a factor of 1.5 at about 30A thickness of Co
film.  Since Co has a large Kerr rotation at shorter wavelengths,
this procedure also leads to wavelength optimization.  Potential
advantage of the present approach is the manufacturability of various
types of exchange coupled films by selecting an optimum thickness for
the maximum Kerr signal and high performance optical storage media.

      Fig. 1  Kerr rotation angle in Co/TbFeCo double-layered films
as a function of Co thickness.  (DLF: Double layered film. SLF:
Single layer film.)

      Disclosed anonymously.