US 12,218,161 B2
Optical sensor, optical sensor unit, optical sensor device, and information terminal device
Hideaki Fukuzawa, Tokyo (JP); Dai Matsuoka, Tokyo (JP); Tomohito Mizuno, Tokyo (JP); and Tetsuya Shibata, Tokyo (JP)
Assigned to TDK CORPORATION, Tokyo (JP)
Filed by TDK CORPORATION, Tokyo (JP)
Filed on Dec. 22, 2021, as Appl. No. 17/559,135.
Claims priority of application No. 2020-214583 (JP), filed on Dec. 24, 2020; application No. 2021-103981 (JP), filed on Jun. 23, 2021; and application No. 2021-154423 (JP), filed on Sep. 22, 2021.
Prior Publication US 2022/0208820 A1, Jun. 30, 2022
Int. Cl. H01L 27/146 (2006.01); H10B 61/00 (2023.01); H10N 50/10 (2023.01); H10N 50/80 (2023.01); G11C 11/16 (2006.01)
CPC H01L 27/14621 (2013.01) [H10B 61/00 (2023.02); H10N 50/10 (2023.02); H10N 50/80 (2023.02); G11C 11/161 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An optical sensor comprising:
a wavelength filter configured to transmit light in a specific wavelength range; and
a magnetic element including a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer sandwiched between the first ferromagnetic layer and the second ferromagnetic layer,
wherein the light in the specific wavelength range transmitted through the wavelength filter is applied to the magnetic element and the light in the specific wavelength range applied to the magnetic element is detected.