Magnetic head and method of making same

Details Magnetic head and method of making same Magnetic head and method of making same

1994-10-03

1997-10-14

Kiliman, Leszek

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

2960301, 2960307, 2960308, 2960313, 1562724, 1562722, H01F 100, G11B 5127

Patent

active

056767684

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. 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, Anisotrophy Field, and Resistivity . . . ," J. Appl. Phys., vol. 69, No. 8, pp. 5011-5013 (Apr. 15, 1991).
M. Miura et al., "Annealing Behavior of Magnetic Anisotophy 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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