Thermomagnetically patterned magnets and method of making same

Details Thermomagnetically patterned magnets and method of making same Thermomagnetically patterned magnets and method of making same

1990-09-28

1992-02-18

Sheehan, John P.

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

21912117, 21912166, H01F 102

Patent

active

050890603

ABSTRACT:
A permanent magnet is heated in a pattern by a laser beam to a localized temperature above the Curie point or a temperature sufficient to reduce the magnet coercivity sufficiently for the field of the magnet or an external field to remagnetize the pattern in the reverse direction. Magnets so produced can have very high pole density, digital encoding and analog patterns having gradually varying local field strength.

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