Low inductance, ferrite sub-gap substrate structure for surface film magnetic recording heads
AssigneeAdvanced Research Corporation
InventorMatthew P. Dugas
Life of this patent
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Abstract
A thin film magnetic recording head is fabricated by forming a substrate from opposing ferrite blocks which have a ceramic member bonded between them. This structure is then diced to form a plurality of columns, wherein each column has a ferrite/ceramic combination. Each column represents a single channel in the completed head. A block of ceramic is then cut to match the columned structure and the two are bonded together. The bonded structure is then cut or ground until a head is formed, having ceramic disposed between each channel. A ferrite back-gap is then added to each channel, minimizing the reluctance of the flux path. The thin film is patterned on the head to optimize various channel configurations.
Claims18
A multi-channel surface film timing-based magnetic recording head comprising:
- a plurality of magnetically permeable columns, each column being divided into two parts by a substantially magnetically impermeable gap member, the gap member forming a sub-gap on a writing side of the head;
- at least one magnetically impermeable barrier, located between and magnetically isolating the plurality of magnetically permeable columns from one another;
- and
- a magnetically permeable thin film layer spanning at least a portion of the sub-gap and magnetically coupling the two parts of each column, wherein the thin film layer includes writing gaps defining a timing-based pattern.
A surface film magnetic recording head having a timing based pattern, the recording head comprising:
- a magnetically permeable core;
- a substantially magnetically impermeable member dividing the core into two poles and forming a sub-gap;
- at least one magnetically impermeable barrier dividing the core and the impermeable member into a plurality of channels;
- and
- a magnetically permeable thin film coupling the two poles across the sub-gap, wherein the thin film includes writing gaps forming a timing based pattern.
Dependencies are inferred from the claim text.