Alps Electric Co., Ltd.

Kinya Aoyagi

Masahiro Iizuka

Hiroshi Yamagami

Koichi Mukasa

Tokuo Nakamura

Seiichi Abiko

Masao Aoki

Jinichi Matsuda

Satoshi Maki

Koji Suzuki

Kazue Masuda

Yasuyuki Kondoh

Akihiro Inada

Junichi Niijima

A magnetic head includes a pair of magnetic core halves provided with at least metal magnetic films are combined together so that the metal magnetic thin films of one of the pair of magnetic core halves are abutted on the thin films of the other. A winding slot is provided in the abutting portions between the pair of magnetic core halves to form a front gap and back gap on both sides of the winding slot. The pair of magnetic core halves are bonded together with first bonding glass adjacent to the back gap, and second bonding glass adjacent to the front gap, which as a thermal expansion coefficient higher than that of the first bonding glass.

Multilayer film core magnetic head with bonding glasses of differing thermal expansion coefficients

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 method for measuring three-dimensional spatial magnetic field distributions used particularly in measuring the magnetic field distribution in a small spatial region such as a leakage magnetic field of a magnetic head and the object thereof is a measuring method capable of measuring a high frequency magnetic field in the small spatial region with a high precision.

Method for measuring three-dimensional spatial magnetic field

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Niigata-ken, Japan

Kinya Aoyagi