Alps Electric Co., Ltd.

Satoshi Maki

Masahiro Iizuka

Tokuo Nakamura

Seiichi Abiko

Hiroshi Yamagami

Kinya Aoyagi

The magnetocrystalline anisotropic energy Kl is set to not more than 100 J/m.sup.3 and the absolute value of the magnetostriction in the &lt;100&gt; direction, as the magnetic circuit direction, is reduced by appropriately selecting the ferrite material composition. Since the magnetocrystalline anisotropic energy Kl is small, the magnetoelastic energy largely affects the anisotropy of the crystallographic axis. The magnetoelastic energy is made negative and small in magnitude by adjusting the average coefficients of thermal expansion of the ferrite material and glass so as to apply a tensile stress around the magnetic gap of the magnetic head. The &lt;100&gt; direction, i.e., magnetic circuit direction, is thereby allowed to coincide with a hard axis of magnetization. As a result, the permeability of the magnetic head is improved at high-frequency bands.

Magnetic head

The present invention relates to a moisture resistant low melting point glass composition for a magnetic head and a magnetic head utilizing it. Said glass composition may be composed of 28-35% PbO, 38-50% SiO.sub.2, 3-10% R.sub.2 O, 3-8% TeO.sub.2, and 1-5% TiO.sub.2 in terms of mole ratio, or 30-40% PbO, 30-40% SiO.sub.2, 10-20% B.sub.2 O.sub.3, 8% or less TeO.sub.2 and 10% or less Bi.sub.2 O.sub.3, cr 30-40% PbO, 30-40% SiO.sub.2, 10-20% B.sub.2 O.sub.3, and 0-8% TeO.sub.2, or 30-40% PbO, 30-40% SiO.sub.2, 10-20% B.sub.2 O.sub.3, and 0-10% Bi.sub.2 O.sub.3.

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Nagaoka, Japan

Satoshi Maki