Matsushita Electric Industrial Co., Ltd.

Hiroshi Youda

Ken Takahashi

Seishi Sasaki

Satoru Mitani

Kenji Kanai

Nobuyuki Kaminaka

Hiroaki Muraoka

A magnetic thin film head used for perpendicular magnetic recording and reproduction. The head includes a magneto-resistive element and a flux guide made of high permeability thin film whose one end portion faces a perpendicular magnetic recording medium. The magnetic flux produced by the magnetization signal on the perpendicular magnetic recording medium is led to the magneto-resistive element through the flux guide. The head also includes electrodes for supplying an electric current londitudinally to the magneto-resistive element, and high permeability members for introducing the magnetic flux through the magneto-resistive element back to the perpendicular magnetic recording medium. The head further includes a exciting means for the flux guide.

Magnetic thin film head

Magnetoresistive thin film head

A thin film magnetic head for reproducing perpendicular magnetization comprising an operative surface disposed to face a recording medium, a thin film magnetization detection portion including a magneto-resistive element perpendicular to the operative surface of the head with one side edge of the magnetization detection portion being exposed to the operative surface, ferromagnetic material with one end thereof being magnetically coupled to the side edge portion of the thin film magnetization detection portion most distant from said operative surface and with the other end thereof being exposed to the operative surface, and a non-magnetic material disposed in an area defined by the thin film magnetization detection portion, the ferromagnetic material and the operative surface, wherein the distance between the thin film magnetization detection portion and the ferromagnetic material at said operative surface is at least five times the distance between the end of the ferromagnetic material magnetically coupled to the side edge portions of the thin film magnetization detection portion and the operative surface.

Thin film magnetic head for reproducing perpendicular magnetization

A method for making magnetic recording heads suitable for mass production with high accuracy. The track width tw or w of the head core is defined by a photolithographic etching method. First, larger grooves are formed by mechanical machining or electrolytic etching to form an outline of the pole piece parts, and then further smaller and shallower grooves are formed with very high accuracy by an etching process, such as electrolytic etching, sputter etching or ion etching at the edges of the first grooves. Thus, the track width of the head core is accurately determined by means of a photolithographic process.

Methods of making magnetic recording heads

Growing community of inventors

Hirakata, Japan

Hiroshi Youda