Magnetically coded device

Details Magnetically coded device Magnetically coded device

1991-11-08

1997-05-20

Lund, Valerie

Stock material or miscellaneous articles

All metal or with adjacent metals

Having magnetic properties, or preformed fiber orientation...

428928, 148101, 148103, 310156, 310154, 335302, 335303, H01F 1032

Patent

active

056310935

ABSTRACT:
Nonmagnetized permanent magnet material is heated in a pattern by a laser beam to a localized temperature above the Curie point or a temperature sufficient to reduce the coercivity sufficiently for an external field to magnetize the pattern in the direction of the field. Magnets so produced can have very high pole density, digital encoding and analog patterns having gradually varying local field strength. Alternating pole magnets of this type can be used for stepper motor magnets.

REFERENCES:
patent: 4312684 (1982-01-01), Chraplyvy et al.
patent: 4347086 (1982-08-01), Chraplyvy et al.
patent: 4438362 (1984-03-01), Brown
patent: 4678634 (1987-07-01), Tawara et al.
patent: 4835505 (1989-05-01), Hattori et al.
patent: 4857786 (1989-08-01), Nihei et al.
Ara et al, "Formation of Magnetic Grating on Steel Plates by Electron/Laser Beam Irradiation", IEEE Transactions on Magnetics, vol. 25, No. 5, Sep. 1989, pp. 3830-3832.
Bradley et al, "Microstructure and Magnetic Properties of CO.sub.2 Laser Surface Melted Nd-Fe-B Magnets", Journal of Magnetism and Magnetic Materials, vol. 86 (1990), pp. 44-50.
Croat et al, "Crystallization of Amorphous Pr.sub.0.27 Co.sub.0.73 : Magnetic Properties and Laser-Induced Coercivity", Appl. Phys. Lett., vol. 37, No. 10, 15 Nov. 1980, pp. 962-964.
Gambino (editor), "Optical Storage Disk Technology", MRS Bulletin, vol. XV, No. 4, Apr. 1990, pp. 20-22.
Greidanus et al, "Magneto-Optical Storage Materials", MRS Bulletin, vol. XV, No. 4, Apr. 1990, pp. 31-39.
Hansen, "Magneto-Optical Recording Materials and Technologies", Journal of Magnetism and Magnetic Materials, vol. 83 (1990), pp. 6-12.
Herbst et al, "Laser Annealing and Selective Mangnetization of Maganese-Aluminum Alloys", Appl. Phys. Lett., vol. 37, No. 8, 15 Oct. 1980, pp. 753-754.
Kryder, "Advanced in Magneto-Optic Recording Technology", Journal of Magnetism and Magnetic Materials, vol. 83 (1990), pp. 1-5.
Lunney et al, "Enhanced Corrosion Resistance of Fe.sub.40 Ni.sub.38 Mo.sub.4 B.sub.18 and Nd.sub.15 Fe.sub.77 B.sub.8 by Laser Glazing", SPIE, vol. 1023 Excimer Lasers and Applications (1988), pp. 216-223.
Weller-Brophy et al, "Materials Challenges in Integrated Optical Recording Heads", MRS Bulletin, vol. XV, No. 4, Apr. 1990, pp. 25-30.

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