Date: July 16-20, 2018
Development of magnetic field sensors is primarily focused on improvement of sensors design and its characteristics – sensitivity, resolution, locality and reliability. One of the modern topics is using magnetic field sensors in biomedical applications which require precision measurements of magnetic field with magnitude of 1 μOe.1 The sensitivity of sensors based on magneto-optical (MO) effects in reflection geometry is not enough for measuring low magnitudes but it can be increased by excitation of surface plasmon-polaritons on metal-dielectric interface which leads to appearance of resonant MO effects. 2,3 Using magnetoplasmonic crystals – multilayer structures fabricated of noble and ferromagnetic layers on substrate with 1D diffraction grating – allows enhancing MO effects and makes possible one to design a DC magnetic field sensor with high sensitivity at a spot of 5 μm2. The sensor measures the DC magnetic field component parallel to controllable the AC magnetic field while the shift of optical beam reveals the magnetic field distribution in the desired volume. The enhanced transversal MO Kerr effect, achieved due to excitation of SPPs, allows detecting magnetic field with sensitivity up to 10−6 Oe.
 L. Marmugi, F. Renzoni, Optical Magnetic Induction Tomography of the Heart, Sci. Rep. 2016, 6, 23962.
 A.A. Grunin, A.G. Zhdanov, A.A. Ezhov, E.A. Ganshina, A.A. Fedyanin, Transversal magneto-optical Kerr effect in two-dimensional nickel magnetoplasmonic crystals, Appl. Phys. Lett. (2010), 97, 261908.
 A.V. Chetvertukhin, T.V. Dolgova, H. Uchida, M. Inoue, A.A. Fedyanin, J., Magneto-optical Kerr effect enhancement at the Wood’s anomaly in magnetoplasmonic crystals, Magn. Magn. Mater., 2012, 324, 3516.
V.K. Belyaev1, V.V. Rodionova1, A.A. Grunin2, A.A. Fedyanin2
1 Center For Functionalized Magnetic Materials (FunMagMa), Immanuel Kant Baltic Federal University, Kaliningrad, 236041 Russia
2 Magnetism Department, Faculty of Physics, Lomonosov Moscow State University, Moscow, 119991 Russia
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Immanuel Kant Baltic Federal University,
Gaidara 6, Kaliningrad, 236022, Russia