Soft magnetic thin film, method for preparing same and magnetic

Details Soft magnetic thin film, method for preparing same and magnetic Soft magnetic thin film, method for preparing same and magnetic

1997-01-02

1998-06-30

Wyszomierski, George

Metal treatment

Stock

Magnetic

148310, 148311, 148318, 420128, H01F 1147

Patent

active

057727970

ABSTRACT:
A soft magnetic thin micro-crystalline film of FeT.sub.b N.sub.c (at %) wherein T is at least one of Zr, Hf, Ti, Nb, Ta, V, Mo and W, and 0<b<20 and 0<c<22 except the range of b.ltoreq.7.5 and c.ltoreq.5, shows low coercivity Hc of 80-400 Am.sup.-1 (1-5 Oe) which is stable upon heating at elevated temperature for glass bonding.
This film is produced by crystallizing an amorphous alloy film of the similar composition at 350.degree.-650.degree. C. to a crystal grain size up to 30 nm to provide uniaxial anisotropy and increased magnetic permeability at higher frequency. It can also provide low magnetostriction around .gamma.s=0.
Composite magnetic head is made using this thin film. Diffusion preventive SiO.sub.2 layer disposed between ferrite core and this thin film in the magnetic head prevents an interdiffusion layer and suppress beat in the output signal.

REFERENCES:
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patent: 5084795 (1992-01-01), Sakakima II et al.
patent: 5262248 (1993-11-01), Ihara et al.
patent: 5382305 (1995-01-01), Terumuma et al.
patent: 5421915 (1995-06-01), Nakanishi et al.
Thermal Stability of Compositionally Modulated Amorphous Nitride Alloy Films, Sakakima et al, The Journal of the Magnetics Society of Japan, vol. 12, No. 2, (1988), pp. 299-304.
Magnetics Properties of Amorphous Films Prepared by N.sub.2 Reactive Sputtering, Sakakima et al, IECE Technical Report MR 86-4, vol. 86, No. 27. pp. 25-32 (IECE: Institute of Electronics & Communication Engineers of Japan.

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