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:
Dec. 30, 2025
Filed:
Feb. 13, 2024
Allegro Microsystems, Llc, Manchester, NH (US);
Samridh Jaiswal, London, GB;
Paolo Campiglio, Arcueil, FR;
Allegro MicroSystems, LLC, Manchester, NH (US);
Abstract
According to one aspect of the present disclosure, a magnetic field sensor includes a magnetoresistance (MR) element. In some embodiments, the MR element includes a reference layer, a free layer, and a barrier layer. In some embodiments the free layer includes two or more cobalt iron boron (CoFeB) layers, wherein a first one of the CoFeB layers is in contact with the barrier layer, and two or more spacer layers. In some embodiments, the CoFeB layers and the spacer layers alternate to form a multilayered free layer structure. In some embodiments, the magnetic field sensor comprises an angle sensor or a current sensor. In some embodiments, the contact between the first one of the CoFeB layers and the barrier layer is configured to reduce hysteresis in the MR element. In some embodiments, the alternating CoFeB layers and spacer layers are configured to increase output amplitude of the MR element.