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arXiv · 2010.01954

Vector magneto-optical magnetometer based on the resonant all-dielectric gratings with highly anisotropic iron-garnet films

D. O. Ignatyeva·G. A. Knyazev·A. N. Kalish·A. I. Chernov·V. I. Belotelov
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Abstract

A sensitive vector magnetometry with high spatial resolution is important for various practical applications, such as magnetocardiography, magnetoencephalography, explosive materials detection and many others. We propose a magnetometer based on the magnetic iron-garnet film possessing a very high magnetic anisotropy, placed in the rotating external magnetic field. Each of the measured magnetic field spatial components produces different temporal harmonics in the out-of-plane magnetization dependence. The dielectric resonant grating placed on the top of an ultrathin film enhanced the magneto-optical response 10 times which makes it possible to achieve 10 times higher spatial resolution in the perpendicular to the film direction. The reported magneto-optical magnetometer allows one to measure simultaneously all three spatial components of the magnetic field with high spatial resolution and sensitivity up to 100 pT/Hz$^{1/2}$.

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D. O. Ignatyeva, G. A. Knyazev, A. N. Kalish, A. I. Chernov, V. I. Belotelov. 2020-09-05. Vector magneto-optical magnetometer based on the resonant all-dielectric gratings with highly anisotropic iron-garnet films. https://doi.org/10.1088/1361-6463%2Fabfb1c

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