Method of making a patterned magnetic recording head
AssigneeAdvanced Research Corporation
InventorMatthew P. Dugas
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Abstract
A thin film magnetic recording head utilizing a timing based servo pattern is fabricated using a focused ion beam (FIB). The recording head is fabricated by sputtering a magnetically permeable thin film onto a substrate. A gap pattern, preferably a timing based pattern, is defined on the thin film and the FIB cuts a gap through the thin film based on that pattern. Once completed, the recording head is used to write a servo track onto magnetic tape. The timing based servo track then allows for the precise alignment of data read heads based on the positional information obtained by a servo read head which scans the continuously variable servo track.
Claims29
A method for fabricating a timing based magnetic recording head comprising:
- providing a substrate;
- depositing a magnetically permeable thin film onto the substrate;
- defining a visually defined timing based gap pattern;
- milling the gap pattern through the magnetically permeable thin film using a focused ion beam, wherein the gap pattern formed by the focused ion beam is matched to the visually defined gap pattern and wherein the focused ion beam is oriented in a direction that is parallel with a resulting gap depth through the magnetically permeable thin film.
A method of fabricating a magnetic recording head for timing based servo tracks comprising:
- providing a magnetically permeable substrate by glass bonding two ferrite blocks to a medially disposed ceramic member;
- sputtering a magnetically permeable thin film onto one surface of the substrate thereby providing a major surface;
- defining a visually defined timing based gap pattern;
- rastering a focused ion beam in a plane orthogonal to the plane of the major surface of the thin film and parallel to a gap depth, milling out the thin film in the defined gap pattern, wherein the gap pattern formed by the focused ion beam is matched to the visually defined pattern;
- coupling the substrate to a coil which controllably causes magnetic flux to flow through the substrate and the thin film.
Dependencies are inferred from the claim text.