Method for manufacturing a magnetic head by a thin-film technique

Claim 1

A method for manufacturing a magnetic head by a thin-film technique, which magnetic head comprises a magnetic conduction body for carrying magnetic flux and having at least two magnet legs which define an enlarged space through which the turns of at least one write and/or read coil winding extends and which have pole surface facing a recording medium disposed in a common plane with a predetermined small spacing from each other, the method comprising the steps of: forming a preliminary product of the magnetic head on a substrate body, the magnet legs of the head extending beyond the plane of the pole surfaces and forming thereby end pieces which are spaced by only a small gap; providing a conductor structure of electrically conducting material mechanically connected with the substrate body; removing the end pieces simultaneously with material-removing machining of the substrate body from the side facing the recording medium up to the plane of the pole surfaces such that said conductor structure is separated, just when the plane of the pole surfaces is reached in the material-removing machining of the substrate body, into two conductor parts electrically insulated from each other; measuring the electric resistance between these conductor parts for controlling the material-removing machining; said step of forming comprising making the preliminary product of the magnetic head, at least in the region of the gap between the end pieces of the magnet legs, such that a first magnet leg is provided with a thin metal layer electrically insulated from the first magnet leg, and depositing the second magnetic leg in the region of its end piece directly on and in electrical contact with the metal layer, said second magnet leg and said metal layer forming said conductor structure.

Claim 2

A method for manufacturing a magnetic head by a thin-film technique, which magnetic head comprises a magnetic conduction body for carrying magnetic flux and having at least two magnet legs which define an enlarged space through which the turns of at least one write and/or read coil winding extends and which have pole surface facing a recording medium disposed in a common plane with a predetermined small spacing from each other, the method comprising the steps of: forming a preliminary product of the magnetic head on a substrate body, the magnet legs of the head extending beyond the plane of the pole surfaces and forming thereby end pieces which are spaced by only a small gap; providing a conductor structure of electrically conducting material mechanically connected with the substrate body; removing the end pieces simultaneously with material-removing machining of the substrate body from the side facing the recording medium up to the plane of the pole surfaces such that said conductor structure is separated, just when the plane of the pole surfaces is reached in the material-removing machining of the substrate body, into two conductor parts electrically insulated from each other; measuring the electric resistance between these conductor parts for controlling the material-removing machining; said step of forming comprising making the preliminary product of the magnetic head, at least in the region of the gap between the end pieces of the magnet legs, such that a first magnet leg is provided with a thin metal layer electrically insulated from the first magnet leg, and depositing the second magnetic leg in the region of its end piece directly on and in electrical contact with the metal layer, said second magnet leg and said metal layer forming said conductor structure.