Sumitomo Special Metals Co., Ltd.

Denki Kagaku Kogyo Kabushiki Kaisha

Nippon Hoso' Kyokai

Sumitomo Special Metal Co. Ltd.

Hideki Mine

Toshiaki Wada

Junji Numazawa

Naoto Hayashi

Akio Murata

Noboru Iwato

Wada Toshiaki

Masami Yamashita

A perpendicular magnetic recording/reproducing thin film head of the single pole type formed of a magnetic member provided on its main surface with a grooved portion, and a non-magnetic material filled in the grooves of the grooved portion, thin film conductor coils, an inter-layer insulation film and a main magnetic pole film, wherein at least the thin film conductor coils, the inter-layer insulation film and the main magnetic pole film are laminated on the magnetic member to form a return path. The magnetic member and the main magnetic pole film are connected at the return path and the thin film head has an exposed laminated end face adapted to be opposed to a recording medium and the magnetic member forming a return path appears on the exposed laminated end face and is formed with a portion having the same width as that of the main magnetic pole film and arranged in parallel with the main magnetic pole film and the remaining portions other than the parallel portion are arranged in non-parallel relationship with the main magnetic pole film.

Magnetic thin film head of a single magnetic pole for perpendicular

A thin film magnetic head for perpendicular magnetic recording includes a magnetic member lying on a wear-resistant substrate of a non-magnetic material and defining a return path for magnetic flux. The magnetic member has a main groove formed in one of its principal surfaces in parallel to a sliding surface adapted to face a magnetic recording medium, and a narrow groove formed in the same principal surface and crossing the main groove at right angles thereto. The main and narrow grooves are filled with a non-magnetic material. The magnetic member carries thereon a laminate formed immediately above the intersection of the main and narrow grooves, and consisting at least of a thin-film conductor coil, an interlayer insulating film, a main pole film and a head-protecting film which are formed one upon another. The narrow groove has a width which is larger than that of the main pole film. The magnetic member is connected to the main pole film through a via hole portion. The magnetic member and the laminate have an exposed surface defining the sliding surface, and the magnetic member is exposed in the vicinity of the main pole film.

Thin-film magnetic head for perpendicular magnetic recording having a

A thin-film magnetic head includes a magnetic member having a principal surface formed with a first groove extending in parallel to a sliding surface adapted to face a magnetic recording medium, a non-magnetic material filling the groove, and at least a thin-film conductor coil, an interlaminar insulating film, a main magnetic-pole film and a protective film formed one upon another. The magnetic member being connected to the main magnetic-pole film though a via hole portion. The head has an exposed laminated surface defining the sliding surface. The magnetic member has also a second groove formed in its principal surface, crossing the first groove at right angles thereto, and filled with a non-magnetic material. The conductor coil and films are formed on the magnetic member immediately above the intersection of the first and second grooves. The non-magnetic material in the second groove is exposed in the sliding surface. The second groove has a width which is smaller than that of the first groove and is slightly larger than that of the main magnetic-pole film adjacent to its end exposed in the sliding surface, and a depth which is at least equal to that of the first groove. The magnetic member is exposed in the sliding surface in the vicinity of the main magnetic-pole film adjacent to its exposed end.

Thin-film perpendicular magnetic recording and reproducing head

A thin-film perpendicular magnetic recording and reproducing head including a magnetic member defining a return path and having a narrow groove formed in one of its principal surfaces in parallel to a sliding surface adapted to face a magnetic recording medium, a non-magnetic material filling the groove, and a multilayer film assembly formed above the groove and consisting at least of a thin-film conductor coil, an interlayer insulating film, a thick main pole film, a main pole film and a protective film formed one upon another. The magnetic member is connected to the main pole film through a via hole portion, and is exposed on the sliding surface in the vicinity of the main pole film so as to face the recording medium. A thin magnetic film serving as a magnetic shield covers the protective film and the sidewall surface of the head and is joined to the sidewall surface of the magnetic member.

Thin-film perpendicular magnetic recording and reproducing head having

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Amagasaki, Japan

Hideki Mine