US 12,320,871 B2
Yoke structures for magnetometers
Jason Janesky, Campbell, CA (US); and Savas Gider, San Jose, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Sep. 23, 2022, as Appl. No. 17/935,013.
Prior Publication US 2024/0103100 A1, Mar. 28, 2024
Int. Cl. G01R 33/09 (2006.01)
CPC G01R 33/093 (2013.01) [G01R 33/091 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A magnetometer comprising:
a yoke structure comprising at least one hard magnetic layer and at least one soft magnetic layer arranged along a dimension of the yoke structure, where a first coercivity of the at least one hard magnetic layer is greater than a second coercivity of the at least one soft magnetic layer, and where the hard magnetic layer provides a bias direction for remanent states in the yoke structure and a stable reset direction for magnetization of the soft magnetic layer after exposure to a magnetic field; and
at least one magnetic sensing element located in proximity to the at least one soft magnetic layer.