Patent ID: 9722175
Date: 2017-08-01
CPC Classifications: B82Y,G01B,G01R,G11B,H01L

Claim:
1. A method to make a single-chip half-bridge magnetic field sensor, comprising: interconnecting one or more GMR or MTJ sensing elements electrically in series to produce a sensor arm, wherein the half-bridge sensor comprises two sensor arms respectively; interconnecting the two sensor arms electrically to form a half-bridge, wherein each of the MTJ or GMR magnetoresistive sensing elements in the two sensor arms have pinning layers with a same pinned magnetization direction; and patterning the one or more GMR or MTJ magnetoresistive sensing elements for each of the two sensor arms into a shape that has a magnetic easy axis, wherein a magnetization direction of a free layer points into a direction of the easy axis of each of the patterned magnetoresistive sensing elements, the method further comprising using biasing means to bias the magnetization direction for a first one of the two sensor arms in a first direction and bias the magnetization direction for a second one of the two sensor arms in a second direction, wherein the two sensor arms have free layers with magnetization directions that have an angle with respect to the pinned magnetization direction that are equal in absolute value and opposite in polarity, and wherein the biasing means are selected from a group of biasing means consisting of: