Stock material or miscellaneous articles – Composite – Of inorganic material
Patent
1993-03-16
1998-11-03
Kiliman, Leszek
Stock material or miscellaneous articles
Composite
Of inorganic material
428694BA, 428900, 427128, 427132, 427250, 4272552, 4272553, 427294, 427559, 427561, 427571, 427599, 2041922, G11B 566, B05D 212
Patent
active
058305882
ABSTRACT:
The invention relates to a method of producing a magnetic material for use in an ultrahigh density magnetic recording medium and to the medium itself. The method general includes the steps of vaporing a ferromagnetic lanthanide rare earth, growing clusters of the ferromagnetic lanthanide rare earth at a temperature below the temperature at which the ferromagnetic lanthanide rare earth forms locked-moment clusters, filtering superparamagnetic clusters from locked-moment clusters, and collecting the locked-moment clusters. Preferably, the ferromagnetic lanthanide rare earth is a ytterbium rare earth. Advantageously lanthanide alloys, mixtures of lanthanide rare earths and alloys of a mixture of lanthanide rare earths can be used. The filtering employs a gradient magnetic field to separate superparamagnetic clusters from moment-locked clusters. The gradient field magnet separates the superparamagnetic clusters which deflect by a large amount from the locked-moment clusters which deflect by a small amount. The separated moment-locked clusters are co-deposited on a substrate with an inert material such as SiO.sub.2. The clusters can be deposited on a substrate in the presence of a magnetic filed transverse to the substrate to form a magnetic recording medium.
REFERENCES:
patent: 4702935 (1987-10-01), Kadono et al.
Bloomfield Louis Aub
Bucher Jean Pierre
Douglass David C.
Kiliman Leszek
Parker Sheldon H.
University of Virginia Patent Foundation
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