The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 18, 2022
Filed:
Aug. 13, 2021
National University of Singapore, Singapore, SG;
National University of Singapore, Singapore, SG;
Abstract
A method for detecting a magnetic field using a spin-orbit torque magnetic field sensor is described. The spin-orbit torque magnetic field sensor comprises a magnetic layer having a switchable magnetic state. The method comprises: (i) providing an alternating current to the sensor for creating an oscillatory spin-orbit torque in the magnetic layer to switch the switchable magnetic state between two magnetic states; and (ii) measuring an output voltage of the sensor, the output voltage being dependent on the magnetic field and is a time average of a time-varying anomalous Hall voltage generated in the magnetic layer in response to the oscillatory spin-orbit torque and the magnetic field. The time-varying anomalous Hall voltage is a function of the alternating current and a Hall resistance of the magnetic layer, and the Hall resistance is associated with a duration in which the switchable magnetization is in each of the two magnetic states and the duration is associated with a magnitude and a polarity of the magnetic field. An apparatus for performing the method is also described.