Mn-Zn single crystalline ferrite head and a method of making the

Details Mn-Zn single crystalline ferrite head and a method of making the Mn-Zn single crystalline ferrite head and a method of making the

1979-03-08

1981-08-25

Parrish, John

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

252 6259, 264 62, 264 65, 264DIG58, C04B 3536

Patent

active

042858941

ABSTRACT:
A magnetic head for magnetic tape recording and reproducing apparatus utilizing Mn-Zn single crystalline ferrite at least for the tip core or front portion of a head core where an air gap is formed, wherein different phases are locally precipitated only at the region including the air gap at the central portion thereof where a running magnetic tape contacts during the recording and reproducing operation of the apparatus. The output of the head is considerably increased with the ferrite noise inherent in single crystalline ferrite heads kept at a low level, in comparison with the conventional single crystalline ferrite heads in which the precipitation of the different phases is not limited to the above-noted region of the head core. The head is made by a method comprising disposing a masking film or coating of metal or oxide over the whole surfaces of the head core except for the above-mentioned region and treating the core at a temperature of 1,000.degree. C.-1,200.degree. C. under an atmosphere with an oxygen density of less than 3%.

REFERENCES:
patent: 3624897 (1971-12-01), Reade et al.
patent: 3655841 (1972-04-01), Akashi et al.
patent: 3824685 (1974-07-01), Burch et al.
patent: 4093688 (1978-06-01), Withop
Watanabe et al., "Low Noise Manganese-Zinc Single Crystal Ferrite Heads," IEEE Trans. on Magnetics, vol. MA6-8, No. 3, Sep. 1972, pp. 497-500.
Watanabe et al., "Growth and Properties of Manganese Zinc Tin Ferrite Single Crystals," J. de Physique, vol. 38, Apr. 1977, pp. C1-51 to C1-55.
Burke et al., "Effect of Post Sinter Cooling Ruts on Manganese Zinc Ferrites," J. Nat'l. Science, 12, 1977, pp. 1490-1491.

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