10.14489/td.2020.10.pp.030-039

2020, 10 October

DOI: 10.14489/td.2020.10.pp.030-039

Komarov V. A.
MAGNETOELASTIC ELECTROMAGNETIC ACOUSTIC TRANSFORMATION. PART 7
(pp. 30-39)

Abstract. A double EMAT has been considered analytically and experimentally for the perpendicular arrangement of the electromagnetic field of the emitter and the polarizing field in ferromagnets. At relatively low conductivities of the samples the transformation leads to the significant discrepancy between the maxima position of the shear waves elastic displacements and the EMF maxima position of the double EMAT along the interface due to the Wiedemann effect. The discrepancy decreases with the approaching to the center of symmetry of the emitter. It has been shown that the transformation efficiency at the Wiedemann effect is determined by the ratio of linear magnetostriction along the direction of the polarizing field to the magnetization along this field. Experimental measurements showed that the Wiedemann effect is characterized by the stretched curve of the EMAT efficiency dependence on the induction or amplitude of the polarizing field with the increase in these values up to the magnetic saturation of the ferromagnet. When the magnetization of the material is normal relative to the interface, the dependence on the conversion efficiency is determined only by the Wiedemann effect for ferrite and by the Wiedemann effect and the electrodynamic effect for a well conducting sample material.

Keywords: transformation of electromagnetic and acoustic waves, plated emitter, Wiedeman effect.

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V. A. Komarov (Physical-Technical Institute, Udmurt Federal Research Center of the Ural Branch of the Russian Academy of Sciences, Izhevsk, Russia) E-mail: Данный адрес e-mail защищен от спам-ботов, Вам необходимо включить Javascript для его просмотра.

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