Dresden 2020 – wissenschaftliches Programm
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MA 53.3: Vortrag
Donnerstag, 19. März 2020, 15:30–15:45, HSZ 401
Magnon-magnon interactions and how to calculate them in a magnetic film — •Halyna Yu. Musiienko-Shmarova1, Vasyl S. Tyberkevych2, Andrey N. Slavin2, Alexander A. Serga1, and Burkard Hillebrands1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaisersalutern, Germany — 2Department of Physics, Oakland University, Rochester, Michigan 48309, USA
Elementary magnetic excitations, often called spin waves or magnons, are widely used in spintronics and magnonics signal processing devices, as they are able to transport energy and spin angular momentum over long distance. Furthermore, recently, fundamental phenomena such as magnon Bose-Einstein condensation, magnonic supercurrents, and Bogoliubov waves were discovered in the field of spin-wave physics. Such processes strongly depend on the interactions between magnons, which can be described using corresponding nonlinear coefficients (nonlinear energy terms of spin-wave Hamiltonian). Besides, the values of these coefficients crucially influence the formation of nonlinear spin-wave objects such as solitons, bullets and droplets. Here, we present a new theoretical approach for the description of weakly nonlinear magnetization excitations. This method allows to directly determine the values of eigenfrequencies and eigenmodes of magnetic excitations and magnon-magnon interaction coefficients in yttrium iron garnet films of different thicknesses for different values and directions of the external magnetic field. Financial support from the ERC Advanced Grant "SuperMagnonics" is acknowledged.