Method of increasing the coercivity of magnetite films

Details Method of increasing the coercivity of magnetite films Method of increasing the coercivity of magnetite films

1972-05-26

1976-12-07

Pianalto, Bernard D.

Coating processes

Magnetic base or coating

Magnetic coating

427130, H01F 1002

Patent

active

039963950

ABSTRACT:
A method of increasing the coercivity of a magnetic device having a magnetite film reduced from alpha ferric oxide. The alpha ferric oxide film is reduced to magnetite by subjecting it to a temperature greater than 400.degree. C in a reducing atmosphere. The temperature of the film is then changed to between about 150.degree. and 300.degree. C, and the reducing atmosphere is replaced by an oxidizing atmosphere. The film is subjected to the oxidizing atmosphere while the temperature is held between 150.degree. and 300.degree. C, thus causing the magnetite film to become partially oxidized to form a solid solution of magnetite and gamma ferric oxide as represented by the formula, (1-x)Fe.sub.3 O.sub.4 .sup.. xFe.sub.2 O.sub.3, where x is between 0.49 and 0.85.

REFERENCES:
patent: 2919207 (1959-12-01), Scholzel
patent: 3031338 (1962-04-01), Bourdeau
patent: 3620841 (1971-11-01), Comstock
patent: 3634137 (1972-01-01), Akashi et al.
patent: 3647661 (1972-03-01), Matsushita
patent: 3652334 (1972-03-01), Abeck et al.
patent: 3653962 (1972-04-01), Akashi et al.
patent: 3703411 (1972-11-01), Melezoglu
patent: 3795542 (1974-03-01), Halaby

Affiliated with

Also associated with

Rating

Method of increasing the coercivity of magnetite films does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of increasing the coercivity of magnetite films, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of increasing the coercivity of magnetite films will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-380419