Hitachi, Ltd.

Computer Basic Technology Research Association

Computer Basic Technology Research Assoc.

Toshihiro Yoshida

Shinji Narishige

Masaaki Sano

Takao Imagawa

Masanobu Hanazono

Kouichi Nishioka

Katsuya Mitsuoka

Tetsuo Kobayashi

Masayuki Takagi

Tsuneo Yoshinari

Mituo Sato

Yutaka Sugita

Masaaki Hayashi

Takashi Onishi

Makoto Morijiri

Reiko Arai

Yokuo Saitoh

Sadanori Nagaike

Akira Kumagai

Yoshikazu Tsuji

A thin film magnetic head has magnetic films, at least one of which is composed of a material containing major components of nickel and iron and one or more element from nitrogen, oxygen and carbon and has two of face-centered cubic system and body-centered tetragonal system, whereby thin film magnetic heads having a high permeability and low coercive force can be provided.

Thin film magnetic head with mixed crystal structures

A thin film magnetic head provided with a first and a second thin film made of a magnetic material, disposed so as to form a closed magnetic circuit; and an intermediate film made of a non-magnetic material, disposed between the first and the second thin films so as to form a magnetic gap at a part of the magnetic circuit; wherein at least one of the first and the second thin films is made of a quaternary amorphous magnetic alloy, whose principal component is cobalt and which contains hafnium, tantalum and palladium.

Quarternary amorphous magnetic alloy thin film and magnetic head

A thin film magnetic head is disclosed which includes a substrate, a first magnetic core disposed on the substrate, a second magnetic core forming a magnetic path in conjunction with the first magnetic core, a conductor coil wound in the magnetic path and a gap formed between ends of the first magnetic core and the second magnetic core. At least one of the first magnetic core and the second magnetic core includes a thin film of a cobalt alloy. The cobalt alloy includes 20-70 atomic percent of cobalt, 20-60 atomic percent of nickel, 12-30 atomic percent of iron and 5-32 atomic percent of palladium.

Thin film magnetic head having magnetic core including a thin film of

A thin film magnetic head comprising a lower magnetic film, an upper magnetic film which is formed over the lower magnetic film and in which one end is come into contact with one end of the lower magnetic film and the other end faces the other end of the lower magnetic film through a magnetic gap and thereby forming a magnetic circuit which has a magnetic gap in a part thereof, together with the lower magnetic film, and a conductor coil forming a coil of a predetermined number of turns and passing between the upper and lower magnetic films and crossing the magnetic circuit. Each of the upper and lower magnetic films is formed of a Co-Ni-Fe ternary alloy having a face-centered cubic crystal structure. Also, uniaxial anisotropy is alternately and perpendicularly given in every layer of a predetermined thickness stacked in the direction of thickness of the film.

Thin film magnetic head having magnetic film of Co-Ni-Fe alloy

A thin film magnetic head comprises a lower magnetic member and an upper magnetic film which constitute a magnetic circuit having a magnetic gap at a predetermined location, and a conductor film forming a coil which intersects the magnetic circuit. At least the upper magnetic film has a magnetostriction constant which is not greater than 6.times.10.sup.-7 in the absolute value.

Thin film magnetic head

A thin film magnetic head comprises an upper magnetic film and a lower magnetic film which cooperate to constitute a magnetic circuit including a magnetic gap, and a coil conductor film constituting a coil having a predetermined number of turns and extending between the upper and the lower magnetic films to intersect the magnetic circuit. The upper magnetic film is composed of a laminate constituted by magnetic thin film layers and non-magnetic thin film layers stacked alternately with each other. An electrically insulating layer formed of a photo-sensitive resin is interposed between the upper magnetic film and the coil conductor film.

Growing community of inventors

Odawara, Japan

Toshihiro Yoshida