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Magneto-Optical Memory System Employing the Equatorial Kerr Effect

IP.com Disclosure Number: IPCOM000041136D
Original Publication Date: 1987-Sep-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Levenson, MD: AUTHOR

Abstract

When the magnetization of a Magneto-Optical (M-O) medium is parallel to the surface and perpendicular to the plane of incidence (that is, normal incidence is excluded) the reflection coefficient for light polarized in the plane of incidence depends on the SIGN of the magnetization. This equatorial Kerr effect provides a means of sensing the information coded in the direction of magnetization without resolving the polarization of the reflected beam. Thus, the M-O head need be only as complex as that used for phase change media. This reduces the cost of the head.

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Magneto-Optical Memory System Employing the Equatorial Kerr Effect

When the magnetization of a Magneto-Optical (M-O) medium is parallel to the surface and perpendicular to the plane of incidence (that is, normal incidence is excluded) the reflection coefficient for light polarized in the plane of incidence depends on the SIGN of the magnetization. This equatorial Kerr effect provides a means of sensing the information coded in the direction of magnetization without resolving the polarization of the reflected beam. Thus, the M-O head need be only as complex as that used for phase change media. This reduces the cost of the head.

The M-O medium is similar to those currently used except that the substrate has deep 45 degree grooves to facilitate the use of non-normal incidence, and materials are chosen to stabilize parallel magnetization. Two reflections from the medium are needed for return of the beam to the head.

Disclosed anonymously.

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