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MA: Fachverband Magnetismus

MA 9: Magnonics I

MA 9.6: Vortrag

Montag, 9. März 2026, 16:15–16:30, HSZ/0004

Understanding change in the sound wave frequency in a ferromagnet under magnetic field influence (Simon effect) in the low-field regime — •Ievgeniia Korniienko¹, Pablo Nieves², and Dominik Legut¹ — ¹IT4Innovations, VSB-TU Ostrava, Ostrava, Czech Republic — ²University of Oviedo, Oviedo, Spain

The Simon effect exhibits itself as the dependence of the ultrasonic wave velocity in a ferromagnetic crystal under applied magnetic field and it was explained using linear theory of magnetoelasticity in 1958. However, the recent research in the interaction of surface acoustic waves with spin waves in ferromagnetic films, as well as widespread use of the pulse echo technique for the study of various materials, has renewed interest in better understanding of the Simon effect. In our work, based on the example of bcc Fe, we propose a refined formula to describe the Simon effect, which contains terms related to dispersion effects associated with the exchange stiffness. We compare our analytical solutions with other alternative computational approaches and show that dispersion effects can be significant and cannot be neglected in the low field regime. As a result, we propose a more accurate analytical formula [1], which, due to its relative simplicity, can become a convenient tool to estimate the magnitude of the magnetic field effect on the sound wave speed propagation in a cubic ferromagnetic crystal, as well as it explains observed deviations from analytically expected results in Simon effect at low magnetic field.

[1] I. Korniienko, et al.: Results in Physics, 73, 108264 (2025).

Keywords: sound wave velocity; Simon effect; magnetoelastic effect; ferromagnet; dispersion