Method of transforming a passive ferromagnetic material into a p

Details Method of transforming a passive ferromagnetic material into a p Method of transforming a passive ferromagnetic material into a p

1989-03-20

1990-04-17

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

148121, 505700, 505727, C21D 104

Patent

active

049177362

ABSTRACT:
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.

REFERENCES:
Dagani, "New Class of Superconductors Pushing Temperature Higher", C.fwdaEN, May 16, 1988, pp. 24 to 29.

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