Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1978-07-13
1981-06-23
Pianalto, Bernard D.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
156628, 204192N, 428900, C23C 1500
Patent
active
042749352
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 anisotropy 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 non-connected 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 non-connected etched channels at the domain wall locations.
REFERENCES:
patent: 3792452 (1974-02-01), Dixon et al.
patent: 3808068 (1974-03-01), Johnson et al.
patent: 4060448 (1977-11-01), Nemiroff
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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