Method of preparing hexagonal ferrite element

Details Method of preparing hexagonal ferrite element Method of preparing hexagonal ferrite element

Filed on

1987-12-18

Date issued

1989-03-28

Examiner

Pianalto, Bernard

Patent Class

Coating processes

SubClass

Electrical product produced

SubSubClass

Integrated circuit, printed circuit, or circuit board

Other Related Categories

427128, 427129, 427130, 427131, 427132, H01F 1002, B05D 306

Type

Patent

Status

active

Patent number

048162922

Description

ABSTRACT:
A hexagonal ferrite element comprising a hexagonal ferrite film layer and a substrate for supporting the ferrite layer is prepared by applying on the substrate a metal-ion solution comprising an iron (II) ion and at least one ion selected from the group consisting of Ba.sup.2+, Sr.sup.2+, Pb.sup.2+, La.sup.3+ and Ca.sup.2+, with the pH of the solution set at 7 or more, thereby oxidizing the iron (II) ion contained in the metal-ion solution to iron (III) ion. For controlling the magneto-optical characteristics of the produced hexagonal ferrite film, other ions such as Co.sup.2+, Co.sup.3+, Al.sup.3+, In.sup.3+ and Ti.sup.4+ may be added to the above metal ion solution, thereby replacing part of iron atoms contained in the ferrite film by such atoms added in the form of ion. Further, for a more controlled and efficient production of the ferrite film, an oxidizing liquid for oxidizing the iron ion, Fe.sup.2+, contained in the metal-ion solution, to Fe.sup.3+ can be used by supplying the oxidizing liquid to the substrate concurrently with or after the application of the metal ion solution.

REFERENCES:
patent: 4544602 (1985-10-01), Kobayashi et al.
patent: 4562105 (1985-12-01), Machida et al.
patent: 4670322 (1987-06-01), Nakamura et al.
patent: 4670323 (1987-06-01), Nakamura et al.
patent: 4690861 (1987-09-01), Nakamura et al.

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