Fujitsu Corporation

Atsuhiko Nagai

Takao Koshikawa

A magnetoresistive head includes a first magnetic shield, an antiferromagnetic layer provided on the first magnetic shield, a pinned ferromagnetic layer provided on the antiferromagnetic layer, a nonmagnetic intermediate layer provided on the pinned ferromagnetic layer, and a free ferromagnetic layer provided on the nonmagnetic intermediate layer. The magnetoresistive head further includes a pair of hard magnetic film bias layers provided on the opposite sides of the free ferromagnetic layer, a pair of terminal layers provided on the hard magnetic film bias layers, a metal oxide film formed on the free ferromagnetic layer at an exposed portion between the pair of terminal layers, and a second magnetic shield provided on the pair of terminal layers and the metal oxide film.

Magnetoresistive head and manufacturing method therefor

A method for the production of a magnetic head, where first a lower magnetic pole is formed on a wafer. Next, a nonmagnetic write gap layer is formed on the lower magnetic pole. A coil is then formed to be sandwiched between nonmagnetic insulating layers on the nonmagnetic write gap layer. Finally, an upper magnetic pole, provided with a pole tip, is formed to contact the write gap layer on the nonmagnetic write gap layer. After formation, a focused ion beam is irradiated in the direction from a thickness of the pole tip to the lateral parts of the pole tip, the nonmagnetic write gap layer lying directly thereunder. The lower magnetic pole thereby trims the lateral parts of the pole tip while consequently decreasing the width of the pole tip. At the same time, depressed parts are formed in the lower magnetic pole in the areas extending outward from directly below the lateral parts of the pole tip. The width of the pole tip is then equalized and a width of the lower magnetic pole is sandwiched by the depressed parts. Lastly, a protective layer is formed, which is made of a nonmagnetic insulating material, fills in the depressed parts, and, at the same time, covers the upper magnetic pole and the lower magnetic pole.

Method for the production of a magnetic head

A magnetic head comprising a lower magnetic pole formed on a wafer, a nonmagnetic write gap layer formed on the lower magnetic pole, an upper magnetic pole formed on the nonmagnetic write gap layer and provided with a pole tip possessing a thin leading end, two depressed parts formed in the lateral directions from directly below the lateral sides of the pole tip and opposed to each other across areas equal in width with the pole tip, a protective layer of a nonmagnetic insulating material adapted to fill the depressed parts and, at the same time, cover the upper magnetic pole and the lower magnetic pole, and a coil nipped between the opposed parts of a nonmagnetic insulating layer interposed between the upper magnetic pole and the lower magnetic pole.

Growing community of inventors

Kawasaki, Japan

Atsuhiko Nagai