G - Physics – 11 – B
Patent
G - Physics
11
B
352/20.3, 352/33
G11B 5/09 (2006.01) G11B 11/105 (2006.01) G11B 20/10 (2006.01)
Patent
CA 1218149
THERMO-MAGNETIC RECORDING OF BINARY DIGITAL INFORMATION ABSTRACT OF THE DISCLOSURE A thermo-magnetic method for recording of a bit of information in each domain of an amorphous alloy thin-film layer supporting small stable domains. Each domain in the recording layer is first magnetized in a first direction, corresponding to a first binary state, by exposure to a saturation magnetic field. The remaining binary state is temporarily or permanently recorded in a particular domain by heating (to a lower or high temperature) that doamin volume of the recording layer above a predetermined temperature, but less than the melting temperature of the layer material, and thereafter cooling the heated domain in the presence of a bias magnetic field of direction opposite to, and magnitude less than, the saturation field. The binary state of each domain is read by interrogation with a beam of energy and utilization of differential effects between the interrogation beam and the direction of the magnetic field in the interrogated domain.
454210
Company General Electric
Eckersley Raymond A.
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