Metal treatment – Stock – Magnetic
Patent
1992-05-05
1995-06-06
Wyszomierski, George
Metal treatment
Stock
Magnetic
148306, H01F 1147
Patent
active
054219159
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.ltoreq.20 and 0<c.ltoreq.22 except the range of b.ltoreq.7.5 and c.ltoreq.5, exhibits 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 .lambda.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:
patent: 4772976 (1988-09-01), Otomo
patent: 4836865 (1989-06-01), Sakakima et al.
patent: 4969962 (1990-11-01), Watanabe et al.
patent: 5084795 (1992-01-01), Sakakima et al.
patent: 5262248 (1993-11-01), Ihara et al.
Carey, R. et al., Magnetic Domains and Techniques for Their Observation Academic Press, 1966, pp. 150-153 and 160-163.
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, No. 27, pp. 25-32 (IECE: Institute of Electronics & Communication Engineers of Japan).
Isomura Tatsuya
Katayama Masaaki
Nakanishi Kanji
Shimizu Osamu
Yoshida Satoshi
Fuji Photo Film Co. , Ltd.
Turner Richard C.
Wyszomierski George
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