Method of Transforming a Passive Ferromagnetic Material into a Permanent Magnet.
Patent Application, Filed 20 Mar 89,
DEPARTMENT OF THE ARMY WASHINGTON DC
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A passive ferromagnetic material is transformed into a permanent magnet with more than double the existing energy product or strength by encasing a bar of the passive ferromagnetic material in an annular shell of superconductive material at a temperature above the transition temperature of the superconductive material, placing the encased ferromagnetic material into an axial magnetic field providing sufficient oersteds to magnetize the passive ferromagnetic material thereby enclosing a large amount of flux in the superconducting shell, lowering the temperature to below the transition temperature of the superconductive material whereupon all of the enclosed flux is permanently trapped, and removing the axial magnetic field. Patent applications. jhd
- Electricity and Magnetism