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MA: Fachverband Magnetismus

MA 57: Posters Magnetism II

MA 57.4: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P3

Multiscale modeling of magnon-phonon dynamics — •Pablo Nieves¹, Sergiu Arapan¹, Domink Legut¹, David Serantes³, and Oksana Chubykalo-Fesenko² — ¹IT4Innovations, VŠB, Ostrava, Czech Republic — ²Instituto de Ciencias de Materiales de Madrid, Madrid, Spain — ³Universidade de Santiago de Compostela, Santiago de Compostela, Spain

Magnon-phonon scattering processes play an essential role in novel magnetic phenomena. Typically, the influence of temperature on the magnetization dynamics is studied. However, there is an inverse effect when the magnetization dynamics produces temperature change, for example in the magnetocaloric effect or during the heating under an ac applied magnetic field. Promising applications like magnetic refrigeration or magnetic hyperthermia treatment for cancer are based on these processes. Recently, we have developed a self-consistent micromagnetic approach to describe both magnetization and phonon temperature dynamics. The approach consists in the simultaneous solution of the quantum Landau-Lifshitz-Bloch micromagnetic equation coupled to the equation for the phonon temperature dynamics. The latter equation is derived from the self-consistent quantum mechanical treatment of the spin-phonon Hamiltonian, which includes direct transformation and Raman processes, based on the general theory for a spin system interacting weakly with a thermal bath. We discuss the main features of this novel micromagnetic approach, possible applications and its deep connection to spin-lattice simulations within a coarse-grained multiscale approach.