Patterned magnetoresistive (MR) device with adjacent flux absorbing stripes
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United States of America Patent
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Mar 6, 2018
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app pub date -
Oct 29, 2015
filing date -
Feb 5, 2008
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Abstract
A magnetic sensor with increased sensitivity, lower noise, and improved frequency response is described. The sensor's free layer is ribbon shaped and is closely flanked at each long edge by a ribbon of magnetically soft, high permeability material. Side stripes of soft magnetic material absorb external field flux and concentrate the flux to flow into the sensor's edges to promote larger MR sensor magnetization rotation. Side stripes are located in the plane of the free layer at a maximum distance of 0.1 microns from each side of the free layer. The free layer has a width <300 nm, a length of >1 micron, and an aspect ratio (thickness/width) of at least 5. Preferably, Mfilmtfilm>Mfreetfree, where Mfilm and Mfree are the magnetization of the soft magnetic layers and free layer, respectively, and ffilm and tfree are the thickness of the soft magnetic layers and free layer, respectively.
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