Material for nonmagnetic oxide substrate and magnetic head

Details Material for nonmagnetic oxide substrate and magnetic head Material for nonmagnetic oxide substrate and magnetic head

1991-11-08

1994-03-01

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501121, 501123, 501136, C04B 3546, C04B 3549

Patent

active

052907384

ABSTRACT:
A nonmagnetic oxide substrate material has a composition of 15 to 60 mol % of NiO, 10 to 70 mol % of CoO, 10 to 40 mol % of TiO.sub.2, and 0.5 to 25 mol % of CaO and is formed of very minute crystal grains. Preferably MgO or ZrO.sub.2 is used as an additive to the material to present a total composition containing the additive of 0.5 to 3 wt % per 100 parts by weight of the nonmagnetic oxide substrate material. Preferably, the substrate material is formulated to have a thermal expansion coefficient falling in the range of from 100 to 140 X 10.sup.-7 /.degree.C. A magnetic head using this substrate material reduces the loss in surface smoothness due to the relative slide with the magnetic tape.

REFERENCES:
patent: 3732552 (1973-05-01), Walraven
IBM Technical Disclosure Bulletinm vol. 33, No. 9, Feb. 1991, "Capactive Measurements of Ferrite Head Air Bearing Surface".
IBM Technical Disclosure Bulletin, vol. 12, No. 8, Jna. 1970, "Control of Slider Aerodynamics in Disk Files".
IBM Technical Disclosure Bulletin, vol. 30, No. 8, Jan. 1988, "Flexible Magnetic Head Slider".

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