The effect of temperature and applied stresses on electromagnetic-acoustic transformation of surface acoustic waves in ferromagnetic materials

Abstract

It has been experimentally found that, if an electromagnetic-acoustic transformation (EMAT) is applied to surface acoustic waves (SAWs) in ferromagnetic materials, a combination of temperature and applied stresses can cause either an increase or a decrease in the amplitude of a detected signal. This depends on the SAW type. Applied stresses can be tested by the EMAT SAW method by the amplitude of the detected signal at a fixed magnetic shift field (in this case, it is necessary to take the temperature into account) or by the bias of the maximum of the field characteristic of the EMAT disregarding the temperature.