Wear pads for timing-based surface film servo heads
A thin film magnetic recording head is provided with a tape bearing surface that has magnetically isolated channels while still providing a maximum continuous surface area with which to engage the media. This can be accomplished by providing spaces in the magnetically permeable thin film that are large enough to prevent cross-talk between the channels, but small enough to prevent significant interference with the moving media. Alternatively, magnetically impermeable thin film spacers can be provided to magnetically isolate each of the channels. The spacers are generally even with the magnetically permeable thin film so as to provide a continuous media-bearing surface.
1. A magnetic recording head comprising:
a magnetically permeable thin film layer forming a tape-bearing surface of a head substrate;
wherein the magnetically permeable thin film layer has been patterned with spaces to form one or more magnetically energizable regions, which each form part of an energizable magnetic circuit of a respective magnetic recording channel, and one or more substantially non-magnetically energized regions, which do not form part of a magnetic circuit of a magnetic recording channel, the magnetically energizable regions and substantially non-magnetically energized regions together forming a substantially uniform and quasi-continuous tape bearing surface, wherein the spaces between the regions are sufficient to allow for magnetic isolation between the regions.
2. The magnetic recording head of claim 1 , wherein a width of each of the spaces is a minimum required to provide magnetic isolation between the regions.
3. The magnetic recording head of claim 1 , wherein the width of each of the spaces is between 1 and 30 microns.
4. A magnetic recording head comprising:
a magnetically permeable thin film layer forming a tape-bearing surface of a head substrate;
wherein the magnetically permeable thin film layer has been patterned with spaces to form more than one magnetically energizable region, forming a substantially uniform and quasi-continuous tape bearing surface, wherein the spaces between the regions are sufficient to allow for magnetic isolation between the regions and the patterned thin film layer approximates a continuous tape-bearing surface; and
wherein each of the magnetically energizable regions form part of an energizable magnetic circuit of a respective magnetic recording channel and each recording channel includes a separate and independent coil for energizing the respective magnetically energizable region.