Magnetic media having a servo track written with a patterned magnetic recording head
AssigneeAdvanced Research Corporation
InventorMatthew P. Dugas
Life of this patent
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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.
Claims30
A magnetic media having a timing based servo track written by a magnetic recording head having a timing based gap pattern, the magnetic recording head comprising:
- a substrate;
- a magnetically permeable thin film deposited onto the substrate;
- and
- a gap pattern milled through the magnetically permeable thin film using a focused ion beam, wherein the gap pattern formed by the focused ion beam is matched to a 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 magnetic tape having a timing based servo pattern written thereon by a magnetic recording head having a timing based pattern, the magnetic recording head comprising:
- a magnetically permeable substrate having two ferrite blocks glass bonded to a medially disposed ceramic member;
- a magnetically permeable thin film sputtered onto one surface of the substrate thereby providing a major surface, wherein a focused ion beam is rastered 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 defined by a visually defined gap pattern, wherein the gap pattern formed by the focused ion beam is matched to the visually defined pattern;
- and
- a coil coupled to the substrate, wherein the coil controllably causes magnetic flux to flow through the substrate and the thin film.
Dependencies are inferred from the claim text.