Apparatus for the formation and polarization of micromagnets

Details Apparatus for the formation and polarization of micromagnets Apparatus for the formation and polarization of micromagnets

1998-10-27

2000-03-07

Hall, Carl E.

Plastic article or earthenware shaping or treating: apparatus

With direct application of magnetic force to manipulate...

29608, 4251748R, 425DIG33, B29C 3332

Patent

active

060331984

ABSTRACT:
A method for making micromagnets and magnets with a micro-polarization pattern on at least one surface thereof. The method includes the steps of molding a ceramic mold form including a cavity therein having a predetermined shape and a serpentine conduit path therethrough adjacent the cavity, the serpentine conduit path having a nominal diameter ranging down to as small as about 50 microns, sintering the mold form, supporting the mold form on a micro-porous substrate within a chamber, flooding one side of the mold form with a molten electrically conductive material, drawing a vacuum within the chamber on an opposite side of the mold form causing the molten electrically conductive material to flow into and through the serpentine conduit path toward the micro-porous substrate, cooling the molten electrically conductive material to form a serpentine electrical conductor in the mold form, forming a ferromagnetic element within the cavity, and imparting a micro-polarization pattern to the ferromagnetic element by transmitting an electrical current through the serpentine conductor.

REFERENCES:
patent: 4123297 (1978-10-01), Jandeska et al.
patent: 5336282 (1994-08-01), Ghosh et al.
patent: 5446428 (1995-08-01), Kumeji et al.
patent: 5800839 (1998-09-01), Kudo et al.

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