Dresden 2020 – wissenschaftliches Programm
Die DPG-Frühjahrstagung in Dresden musste abgesagt werden! Lesen Sie mehr ...
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
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.