Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1980-11-17
1982-02-09
Pianalto, Bernard D.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
156628, 204192N, 427128, 428900, C23C 1500
Patent
active
043148948
ABSTRACT:
A magnetic layer for storing information in the form of a fixed, two-dimensional array of magnetic domains. The magnetic layer can be magnetized in either of two opposite directions normal to the plane of the layer. The walls of the domains are fixed by local gradients in the value and direction of the magnetic anistropy and in the value and direction of the magnetic exchange energy of the magnetic layer. The local gradients may be caused by a relatively high defect density at the domain wall locations, by implanting ions into the magnetic layer at the locations of the domain walls thereby causing a local expansion of the crystal lattice of the layer, and/or by etching a multiplicity of nonconnected tapering channels in and substantially perpendicular to the plane of the magnetic layer at these locations. Where tapering channels are used, the magnetic layer is provided on a substrate such that the crystal lattice constant of the magnetic layer is different from the crystal lattice constant of the substrate. In another embodiment, the local gradients can be the result of the epitaxial growth of a magnetic layer on a substrate which has a plurality of nonconnected etched channels at the domain wall locations.
REFERENCES:
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patent: 3996571 (1976-12-01), Chang
patent: 4060448 (1977-11-01), Nemiroff et al.
"Modification of Magnetic Anisotropy in Garnets by Ion Implantation," Wolf et al., Applied Physics Let., vol. 19, No. 8, Oct. 15, 1971, pp. 298-299.
"Ferromagnetic Garnet Films for Magnetoptic Information Storage," Krumme et al., IEEE Trans on Magnetics, vol. Mag-11, No. 5, Sep. 1975, pp. 1097-1192.
"Ion Implantation in Semiconductors and Other Materials", Proceedings of the Third International Conference held at IBM Thomas J. Watson Research Center, 1972, Plenum Publishing Corporation, New York, pp. 505-525.
Heitmann Heinrich
Krumme Jens-Peter
Schmelzer Christoph
Spohr Reimar
Witter Klaus
Pianalto Bernard D.
Schechter Marc D.
U.S. Philips Corporation
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