Abstract A method for fabricating an array of read-write heads for a magnetic storage means, such as a disk or drum, is disclosed. Each head is comprised of a flux-carrying means, such as a gapped magnetic loop inductively coupled to a flux-producing means, such as a pair of coils. The coils, together with a portion of the associated addressing circuitry, are formed on a high resistivity substrate. The halves of the magnetic loops that lie on opposite sides of the coil assembly are fabricated in the relative position on two separate assemblies. The two assemblies are then bonded to opposite sides of the coil assembly so that the halves of the magnetic loops mate through holes in the substrate to form the complete gapped magnetic loops. The excess material of the assemblies is then cut away as required to leave magnetically isolated magnetic loops and the associated coils embedded within a solid body. The sensing gaps of the magnetic loops are formed by vacuum depositing a thin layer of nonmagnetic material on a face of one ferrite part, disposing a second ferrite part against the thin nonmagnetic layer and bonding the two ferrite parts together, taking a section of two ferrite parts normal to the nonmagnetic layer, and bridging the nonmagnetic layer with a third ferrite part to complete the magnetic loop. The loop assemblies may be formed by cutting grooves in the faces of ferrite blocks to form a number of ferrite mesas corresponding to the number of read-write heads. The grooves are then filled with a nonmagnetic material to magnetically isolate the ferrite mesas. The loop assemblies are then bonded to opposite sides of the coil assembly before being separated from the ferrite block. Alternatively, the ferrite assembly may be formed by laminating a layer of ferrite material, or two layers of ferrite material separated by a thin layer of nonmagnetic material for forming a sensing gap, between two layers of nonmagnetic material, slicing the layers in a plane normal to the layers to produce a number of slices each having a strip of ferrite disposed between strips of nonmagnetic material, then laminating these slices such that each strip of ferrite is isolated by nonmagnetic material. This laminated structure is again sliced normal to the last laminating joints to produce slices having individually isolated ferrite islands extending normal to the slice. Each ferrite island is then incorporated into a magnetic loop.
In a method for fabricating an array of magnetic read-write heads each comprised of a magnetic loop with a flux-sensing gap and a coil individually coupled to the magnetic loop, the steps of: bonding at least one layer of ferrite to at least one layer of nonmagnetic material, slicing said at least one ferrite layer normal to said nonmagnetic layer to form a first plurality of slices each having a strip of ferrite material and a strip of nonmagnetic mAterial, reversing alternate of said slices, and bonding said slices together thereby forming a first structure in which each of said strips of magnetic material are separated from each other by a strip of nonmagnetic material, slicing said first structure normal to said magnetic strip to form a second plurality of laminated assemblies, and machining at least one surface of said assemblies to form a plurality of ferrite stubs, said stubs protruding from a substantially flat surface.
Claim 2
Dependent Claim
156 words
In a method for fabricating an array of magnetic read-write heads each comprised of a magnetic loop with a flux-sensing gap and a coil individually coupled to the magnetic loop, the steps of: bonding at least one layer of ferrite to at least one layer of nonmagnetic material, slicing said at least one ferrite layer normal to said nonmagnetic layer to form a first plurality of slices each having a strip of ferrite material and a strip of nonmagnetic mAterial, reversing alternate of said slices, and bonding said slices together thereby forming a first structure in which each of said strips of magnetic material are separated from each other by a strip of nonmagnetic material, slicing said first structure normal to said magnetic strip to form a second plurality of laminated assemblies, and machining at least one surface of said assemblies to form a plurality of ferrite stubs, said stubs protruding from a substantially flat surface.
Claim 3
Dependent Claim
20 words
The method defined in claim 1 wherein there is one layer of ferrite bonded between two layers of nonmagnetic material.
Claim 4
Dependent Claim
37 words
The method defined in claim 1 wherein there are two layers of ferrite bonded together by a layer of nonmagnetic material having a thickness corresponding to the width of the flux sensing gap of the magnetic loops.
Claim 5
Dependent Claim
22 words
The method defined in claim 3 wherein each of the layers of ferrite is also bonded to another layer of nonmagnetic material.
Claim 6
Dependent Claim
22 words
The method defined in claim 1 wherein at least two of the slices are bonded together by a slice of nonmagnetic material.