Patent ID: 11959815
Assignee: THE UNIVERSITY OF TOKYO
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 12:
13. A stress sensor comprising:
a stress detection layer including a laminated body including a first ferromagnetic layer, a first non-magnetic layer, a second ferromagnetic layer, and an antiferromagnetic layer stacked one on another, wherein:
the antiferromagnetic layer includes Mn,
a magnetization direction of the second ferromagnetic layer is fixed by an exchange bias caused by an exchange coupling with the antiferromagnetic layer, and
the stress sensor detects a stress by an electric resistance depending upon a relative angle between magnetization directions of the first ferromagnetic layer and the second ferromagnetic layer, the relative angle changing depending upon an externally applied stress, wherein:
the stress detection layer further includes a third ferromagnetic layer, a second non-magnetic layer, and a fourth ferromagnetic layer, in addition to the laminated body, and
a magnetization direction of the third ferromagnetic layer is fixed by an exchange bias caused by an exchange coupling with the antiferromagnetic layer.