Patent ID: 11959815
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 13:
14. A method for manufacturing a stress sensor, the method comprising:
performing annealing of at least a second ferromagnetic layer and an antiferromagnetic layer of the stress sensor in a magnetic field, wherein the performing of the annealing in the magnetic field comprises:
heat treating the second ferromagnetic layer and the antiferromagnetic layer in the magnetic field,
cooling the second ferromagnetic layer and the antiferromagnetic layer to room temperature in the magnetic field,
forming an exchange coupling between the second ferromagnetic layer and the antiferromagnetic layer, and
fixing a magnetization direction of the second ferromagnetic layer by an exchange bias caused by the exchange coupling, and

wherein the stress sensor detects a stress by an electric resistance depending upon a relative angle between magnetization directions of a first ferromagnetic layer and the second ferromagnetic layer, the relative angle changing depending upon an externally applied stress.