Three-gap magnetic recording head having a single flux sensing means

Claim 2

A multigap magnetic head assembly for use in magnetic record/reproduce systems comprising: a first inner magnetic core having first and second leg portions defining a first transducer gap therebetween; a second outer magnetic core having a third and fourth leg portions, said first core maintained spaced apart from said second core, said first and third leg portions defining a second transducer gap therebetween and said second and fourth leg portions defining a third transducer gap therebetween wherein said first and said second and said third transducer gaps are substantially the same length; a single flux sensing means linked with Said first core means; said core assembly characterized by a sensitivity function such that the magnetic field across the second and third outer transducer gaps is of a lesser magnitude and in the opposite direction than the magnetic field produced by the first transducer gap.

Claim 3

The magnetic head assembly as set forth in claim 1 wherein said second outer magnetic core has a different reluctance than the reluctance of said first magnetic core.

Claim 4

The magnetic head assembly set forth in claim 1 wherein said second core has a smaller cross-sectional area than said first inner magnetic core.

Claim 5

The magnetic head assembly set forth in claim 1, wherein the pole tips of said first magnetic core and said second magnetic core are coplanar.

Claim 6

The magnetic head as set forth in claim 2, wherein said single flux sensing means comprises a coil.

Claim 7

The magnetic head as set forth in claim 2 wherein said transducer gaps have a gap length such that the ratio of magnetic fields across said second magnetic core to that of said first magnetic core is between - 1/4 and - 1/2 .

Claim 8

A multigap magnetic head assembly for use in magnetic record/reproduce systems comprising: a nonmagnetic substrate; a first magnetic layer selectively deposited on said substrate; a first nonmagnetic layer selectively deposited on said first magnetic layer; a second magnetic layer selectively deposited on said first nonmagnetic layer; a first conductive layer selectively deposited on said second magnetic layer and said substrate so as to form a coil; a third magnetic layer selectively deposited over said conductor layer and against the second magnetic layer, said second and third magnetic layers comprising an inner magnetic core, said conductive layer disposed between said second and said third magnetic layers; a second nonmagnetic layer selectively deposited over said third magnetic layer; and a fourth magnetic layer deposited over said second nonmagnetic layer, said end portion of each of said first and said second and said third and said fourth magnetic layers disposed in a common plane perpendicular to the plane of said substrate and defining a respective pole tip of said magnetic head; and means for energizing said conductive layer whereby said energization produces a composite magnetic fringing field beneath said pole tips; wherein the composite magnetic field produced is characterized by a sensitivity function such that a first portion of the magnetic field produced between said first and second magnetic layers is substantially equal to a second portion of the magnetic field between said third and said fourth magnetic layers, said first portion and said second portion of said magnetic field having a smaller magnitude and being in the opposite direction than a third portion of the magnetic field produced between said third and said second magnetic layers.

Claim 9

A multigap magnetic head assembly for use in magnetic record/reproduce systems comprising: a nonmagnetic substrate; a first magnetic layer selectively deposited on said substrate; a first nonmagnetic layer selectively deposited on said first magnetic layer; a second magnetic layer selectively deposited on said first nonmagnetic layer; a first conductive layer selectively deposited on said second magnetic layer and said substrate so as to form a coil; a third magnetic layer selectively deposited over said conductor layer and against the second magnetic layer, said second and third magnetic layers comprising an inner magnetic core, said conductive layer disposed between said second and said third magnetic layers; a second nonmagnetic layer selectively deposited over said third magnetic layer; and a fourth magnetic layer deposited over said second nonmagnetic layer, said end portion of each of said first and said second and said third and said fourth magnetic layers disposed in a common plane perpendicular to the plane of said substrate and defining a respective pole tip of said magnetic head; and means for energizing said conductive layer whereby said energization produces a composite magnetic fringing field beneath said pole tips; wherein the composite magnetic field produced is characterized by a sensitivity function such that a first portion of the magnetic field produced between said first and second magnetic layers is substantially equal to a second portion of the magnetic field between said third and said fourth magnetic layers, said first portion and said second portion of said magnetic field having a smaller magnitude and being in the opposite direction than a third portion of the magnetic field produced between said third and said second magnetic layers.

Claim 10

The magnetic head assembly as set forth in claim 7, wherein the gap lengths between adjacent pole tips in said common plane are substantially equal.