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Single chip push-pull bridge-type magnetic field sensor

  • US 9,664,754 B2
  • Filed: 04/01/2012
  • Issued: 05/30/2017
  • Est. Priority Date: 04/06/2011
  • Status: Active Grant
First Claim
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1. A single-chip push-pull magnetoresistive sensor bridge, comprisinga sensor bridge comprised of magnetoresistive sensor arms, wherein each magnetoresistive sensor arm comprises multiple magnetic tunnel junction (MTJ) or giant magnetoresistance (GMR) magnetoresistive elements, each of the magnetoresistive elements has a magnetic pinned layer that has a same pinned layer magnetization direction as the other magnetoresistive elements, each of the magnetoresistive elements has a free layer that has a magnetization direction, and each of the magnetoresistive elements is sensitive to a magnetic field along a sensing direction that is perpendicular to the pinned layer magnetization direction;

  • andpermanent magnets disposed on two sides of each of the magnetoresistive sensor arms to bias the direction of the magnetization of the multiple magnetoresistive elements in each of the magnetoresistive sensor arms, wherein the permanent magnets are oriented to provide for each sensor arm a magnetic bias used to preset the magnetization direction of the free layer for the respective sensor arm, and the permanent magnets provide magnetic biases in different directions for adjacent sensor arms to preset the magnetization direction of the free layer for adjacent sensor arms in different directions, the preset magnetization direction of the free layer for adjacent sensor arms being either a sharp angle or obtuse angle with respect to the sensing direction such that the preset magnetization is not aligned with either of the sensing direction or the pinned layer magnetization direction.

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