S. V. Tarasenko, V. G. Shavrov, “Elastostatic spin waves — ‘fine structure’ of magnon polaron spectrum of acoustically subwavelength magnetic layer”, UFN, 2025, Volume 195, Number 9,Pages <nobr>1008

METHODOLOGICAL NOTES

Elastostatic spin waves — ‘fine structure’ of magnon polaron spectrum of acoustically subwavelength magnetic layer

S. V. Tarasenko^a, V. G. Shavrov^b

^a Galkin Donetsk Institute for Physics and Engineering
^b Kotelnikov Institute of Radioengineering and Electronics, Russian Academy of Sciences, Moscow

Abstract: Using the example of a solitary acoustically subwavelength magnetic layer, it is shown that employing the tensor Green's function to solve the elastostatic boundary value problem makes it possible to obtain the spectrum structure of magnon polarons in a form convenient for analysis, associated with the formation of a special class of exchange-free magnons — elastostatic spin waves and resonance anomalies accompanying them. In combination with a similar approach previously developed for calculating the spectrum of dipole-exchange magnons, the method can be an alternative to the traditional method of studying analytically the dispersion features of magnetoacoustic waves propagating in layered structures under conditions of simultaneous magnetoelastic, magnetodipole, and inhomogeneous exchange interactions.

Keywords: acoustically subwavelength magnetic layers, magnon polarons, Green's functions

PACS: 75.30.Ds, 75.70.Ak, 75.76.+j

Received: January 19, 2025
Accepted: March 11, 2025

DOI: 10.3367/UFNr.2025.03.039878