The dependence of a longitudinal giant magnetoimpedance (GMI) effect of a [Fe21Ni79/Cu]5/Cu/[Fe21Ni79/Cu]5 film element on the position of a magnetic insert is investigated in a model experiment on detecting a clot in a blood vessel. The magnetic insert is an epoxy composite containing 30 wt.% of the iron oxide microparticles. An investigation of the magnetic properties of the film element and the magnetic composite cylinder-shaped sample is performed. The magnetic insert is placed at a distance of 1.1 mm above the film surface and can be displaced perpendicular to its longer side with a step of 1 mm. As soon as the magnetic insert approaches the element, the maximum value of magnetoimpedance (MI) ratio for resistance is observed to decrease, and there is a shift of the curves of the MI ratio for resistance along the external magnetic field lines. The magnetic stray fields influencing the film in each position of the magnetic insert are simulated with the Comsol software and compared with the GMI response.
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Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 10, pp. 86–90, October, 2021.
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Melnikov, G.Y., Lepalovsky, V.N. & Kurlyandskaya, G.V. GMI-Detection of a Magnetic Composite Imitating a Blood Vessel Clot. Russ Phys J 64, 1880–1885 (2022). https://doi.org/10.1007/s11182-022-02536-1
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DOI: https://doi.org/10.1007/s11182-022-02536-1