Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1996-05-29
1998-08-11
Zimmerman, John J.
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369288, 428694SC, 428694ML, G11B 700, G11B 708, G11B 724
Patent
active
057937117
ABSTRACT:
A magneto-optic memory and a magnetic material is described incorporating a polarized light beam directed towards a magnetic material and an analyzer for intercepting the polarized light beam after passing through the magnetic material or after being reflected by the magnetic material. The magnetic material includes a matrix of metal such as iron, cobalt, nickel, and alloys thereof and a plurality of separated phases distributed in the matrix such as EuS, EuO, EuOTb, PtMnSb, MnAs, MnBi, MnSb, CrO.sub.2, CrTe, GdN, Gd.sub.4 C, other compounds of a rare earth element and manganese compounds. Terbium or neodymium may be dissolved in the matrix of metal and in the plurality of separated phases. The invention overcomes the problem of providing a magnetic material having a Curie point above room temperature, a square perpendicular hysteresis loop at room temperature, a large magneto-optic rotation at the wavelength of interest and a deposition temperature suitable depositing on polymer substrates.
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Bojarczuk, Jr. Nestor Alexander
Gambino Richard Joseph
Ruf Ralph
International Business Machines - Corporation
LaVilla Michael
Trepp Robert M.
Zimmerman John J.
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