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Magnetic Noise of Flux Gates and Magnetic Modulation Sensors with an Amorphous Ferromagnetic Core

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Abstract

It has been noted that the main part of the magnetic noise in flux gates and magnetomodulation sensors with cores of amorphous ferromagnetic alloys obtained by the rapid quenching method arises as a result of strong magnetoelastic interaction. Recent advances in lowering the sensitivity threshold of active weak magnetic field sensors based on amorphous ferromagnetics are considered. An evaluation of the average amplitude of the magnetic noise of magnetomodulation sensors with an amorphous ferromagnetic core operating in the mode of auto-parametric amplification has been carried out. It is shown that the average amplitude of the magnetic noise of magnetomodulation sensors can be ~0.45 pT at a frequency of 0.1 Hz and less than 0.1 pT at frequencies above 3 Hz.

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Authors and Affiliations

  1. Institute of Geophysics, Ural Branch, Russian Academy of Sciences, 620016, Yekaterinburg, Russia

    O. L. Sokol-Kutylovskii

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  1. O. L. Sokol-Kutylovskii
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Correspondence to O. L. Sokol-Kutylovskii.

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Sokol-Kutylovskii, O.L. Magnetic Noise of Flux Gates and Magnetic Modulation Sensors with an Amorphous Ferromagnetic Core. Instrum Exp Tech 64, 754–758 (2021). https://doi.org/10.1134/S0020441221050110

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  • DOI: https://doi.org/10.1134/S0020441221050110

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