Magnetic field sensor based on magnetoplasmonic crystal

Victor K Belyaev; Valeria V Rodionova; Andrey A Grunin; Mitsuteru Inoue; Andrey A Fedyanin

doi:10.1038/s41598-020-63535-1

Magnetic field sensor based on magnetoplasmonic crystal

Sci Rep. 2020 Apr 28;10(1):7133. doi: 10.1038/s41598-020-63535-1.

Authors

Victor K Belyaev¹, Valeria V Rodionova², Andrey A Grunin³, Mitsuteru Inoue⁴, Andrey A Fedyanin⁵

Affiliations

¹ Institute of Physics, Mathematics and Informational Technologies, Immanuel Kant Baltic Federal University, Kaliningrad, 236041, Russia. belyaev@lnmm.ru.
² Institute of Physics, Mathematics and Informational Technologies, Immanuel Kant Baltic Federal University, Kaliningrad, 236041, Russia.
³ Faculty of Physics, Lomonosov Moscow State University, Moscow, 119991, Russia.
⁴ Toyohashi University of Technology, Toyohashi, 441-8580, Japan.
⁵ Faculty of Physics, Lomonosov Moscow State University, Moscow, 119991, Russia. fedyanin@nanolab.phys.msu.ru.

Abstract

Here we report on designing a magnetic field sensor based on magnetoplasmonic crystal made of noble and ferromagnetic metals deposited on one-dimensional subwavelength grating. The experimental data demonstrate resonant transverse magneto-optical Kerr effect (TMOKE) at a narrow spectral region of 50 nm corresponding to the surface plasmon-polaritons excitation and maximum modulation of the reflected light intensity of 4.5% in a modulating magnetic field with the magnitude of 16 Oe. Dependences of TMOKE on external alternating current (AC) and direct current (DC) magnetic field demonstrate that it is a possibility to use the magnetoplasmonic crystal as a high-sensitive sensing probe. The achieved sensitivity to DC magnetic field is up to 10^-6 Oe at local area of 1 mm².