Magnetic head

Details Magnetic head Magnetic head

1995-10-30

1997-02-18

Kiliman, Leszek

Stock material or miscellaneous articles

Composite

Of inorganic material

428336, 428694R, 428694T, 428694TM, 428694TS, 428900, 360126, G11B 566, G11B 5147, B32B 900

Patent

active

056040458

ABSTRACT:
A ring-type magnetic head is of a structure in which a metallic magnetic film is sandwiched between two substrates, and the metallic magnetic film has a saturation magnetic field not less than 50 A/m in all directions parallel to a film plane thereof; the direction of lamination of the sandwich is generally perpendicular to a gap-forming surface of the head; where the metallic magnetic film is a Co-containing magnetically soft film having a crystallization temperature Tx greater than the Curie temperature Tc, the metallic magnetic film is subjected to a first heat treatment at a temperature not less than Tc and a second heat treatment at a temperature Ta of Tc-180.degree. C..ltoreq.Ta.ltoreq.Tc-30.degree. C. in the absence of any applied magnetic field; where the metallic magnetic film is a Co-containing magnetically soft film having a crystallization temperature Tx less than the Curie temperature Tc, the metallic magnetic film is subjected to a first heat treatment at a temperature not greater than Tx while a rotating magnetic field is being applied thereto and a second heat treatment at a temperature Ta of Tx-200.degree. C..ltoreq.Ta.ltoreq.Tx-50.degree. C. in the absence of any applied magnetic field.

REFERENCES:
N. Kaminaka et al., "Co-based Superstructured Nitride Alloy Films . . . , " IEEE Transactions on Magnetics, vol. 26, No. 6, pp. 2936-1941 (Nov. 1990).
C. S. Tsai et al., "High Frequency Characteristics of Annealed Co-base Amorphous Alloy Ribbons," J. Appl. Phys., vol. 70, No. 10, pp. 5846-5848 (Nov. 15, 1991).
Y. Omata et al., "Initial Permeability of Co-based Amorphous Films at High Frequencies," IEEE Translation Journal on Magnetics in Japan, vol. 4, No. 8, pp. 518-525 (Aug. 1989).
T. Takahashi et al., "Annealing Dependence of Coercivity, Anisotropy Field, and Resistivity . . . , " J. Appl. Phys., vol. 69, No. 8, pp. 5011-5013 (Apr. 15, 1991).
M. Miura et al., "Annealing Behavior of Magnetic Anisotropy in CoNbZr Films," IEEE Transactions on Magnetics, vol. 24, No. 5, pp. 2215-2220 (Sep. 1988).
T. Jagielinski, "Trends in Materials Development for Magnetic Recording Heads," Materials Science & Engineering B, vol. B3, No. 4, pp. 467-471 (Sep. 1989).

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