Fuji Electric Co., Ltd.

Yuko Arimoto

Hisashi Yamasaki

Osamu Saito

Hiroyuki Uwazumi

Toyoji Ataka

Keiji Ohkubo

Takabumi Fumoto

Keiji Okubo

A thin film magnetic head includes an upper magnetic core film and a lower magnetic core film laminated one on another through a magnetic gap layer. The upper and lower magnetic core films are multilayer thin films, respectively, each of which is composed of a plurality of magnetic thin film layers and a plurality of non-magnetic thin film layers, alternately laminated one on another. The magnetic core films and have single domain structures, respectively, and the use of such magnetic core films realizes a thin film magnetic head having high permeability at high frequencies and improved high frequency characteristics and attains high recording density.

Thin film magnetic head

A thin-film magnetic head is disclosed that includes a lower magnetic core and an upper magnet core formed on the surface of a substrate and connected together at a first end thereof, a magnetic gap is formed between the lower and upper magnetic cores at a second end thereof, and a coil-form electric conductive layer is located between the lower magnetic core and the upper magnet core. The lower and upper magnetic cores have a saturated magnetic flux density from 10,000 G to 18,000 G, while the magnetic permeability along the magnetic path of the magnetic head is 3,000 or higher at a frequency of 10 MHz. The unique characteristics of the magnetic head are obtained by heating an arrangement comprising the lower and upper magnetic cores, the magnetic gap layer, and the electric conductive layer to a temperature above 325.degree. C., and applying an external magnetic field greater than 0.01 kOe to the lower and upper magnetic cores to relax their magnetic anisotropy as the lower and upper magnetic cores are cooled during the manufacturing process.

High permeability thin-film magnetic head and method of manufacture

Growing community of inventors

Yokohama, Japan

Yuko Arimoto