Hitachi Metals, Ltd.

Hitachi, Ltd.

Hiroshi Tomishima

Toshikazu Nishiyama

Kazuhiro Tsuchiya

Takeshi Miyazaki

Noriyuki Kumasaka

Yasutaka Suzuki

Nobuyuki Yamada

Mitsuo Abe

A magnetic disk recording device having a continuous medium type magnetic disk and a magnetic head slider, wherein the magnetic head slider is formed of a sintered body essentially consisting of titanium oxide as the major component thereof and at least one selected from the group consisting of Y, Yb, Nb, Mg, Er, Fe, Cr, Zr and Al in an amount of from 2 atm % to 50 atm % with respect to the titanium oxide, whereby a higher recording density is realized while maintaining a higher reliability of the device over long time span.

Magnetic head slider and magnetic disk device using the same

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.

Material for nonmagnetic oxide substrate and magnetic head

Nonmagnetic substrate material containing 67 to about 89.9 mol % of MnO, 10 to 33 mol % of NiO, and at least 0.1 mol % but not more than 10 mol % of a material selected from the group of CaO, ZrO.sub.2, V.sub.2 O.sub.5, Y.sub.2 O.sub.3, and Cu and having a rock salt-type crystalline structure.

MnO/NiO-based nonmagnetic substrate material

A magnetic head having a magnetic alloy film superposed on a nonmagnetic substrate. The nonmagnetic substrate material contains 67 to about 89.9 mol % of MnO, 10 to 33 mol % of NiO, and at least 0.1 mol % but not more than 10 mol % of a material selected from the group of CaO, ZrO.sub.2, V.sub.2 O.sub.5, Y.sub.2 O.sub.3, and Cu and has a rock salt-type crystalline structure.

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Saitama, Japan

Hiroshi Tomishima