Low hysteresis high sensitivity magnetic field sensor
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United States of America Patent
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Apr 26, 2016
Grant Date -
Jul 4, 2013
app pub date -
Dec 30, 2011
filing date -
Dec 30, 2011
priority date (Note) -
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Abstract
An MTJ sensor having low hysteresis and high sensitivity is disclosed. The MTJ sensor includes, in one embodiment, a bridge with first and second active MTJ elements and first and second passive MTJ elements connected in a Wheatstone bridge configuration. First and second magnetic shield elements are located over the first and second passive MTJ elements and form a gap therebetween that concentrates magnetic flux toward the first and second active MTJ elements. A three-dimensional coil is wound around the first and second magnetic shield elements with over-windings located over the first and second magnetic shield elements and under-windings located under the first and second magnetic shield elements, connected together by a plurality of vias adjacent the first and second magnetic shield elements.
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