SKM 2021 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 15: Posters Magnetism IV
MA 15.19: Poster
Donnerstag, 30. September 2021, 13:30–16:30, P
Functional Properties of Ni-Mn-based Heusler alloys — •Olga Miroshkina1,2, Markus Ernst Gruner1, Vasiliy Buchelnikov2, and Vladimir Sokolovskiy2 — 1Faculty of Physics, University of Duisburg-Essen, 47048 Duisburg, Germany — 2Condensed Matter Physics Department, Chelyabinsk State University, 454001 Chelyabinsk, Russia
Multifunctional materials exhibiting the magnetocaloric effect (MCE) at first-order phase transitions are subject to intense fundamental and applied research as a more efficient and ecologically friendly alternative to conventional compressor devices. The combination of density functional theory and empirical models has proven as a useful tool in the theory-guided search for optimized MCE materials with large entropy and temperature change together with low temperature hysteresis. In this work, we consider a statistical model based on the theory of diffuse phase transitions, the Bean-Rodbell model of first-order phase transitions, and the molecular mean-field approach. The proposed model is applied to Ni-Mn-(Ga,In) Heusler alloys demonstrating different sequences of the magnetic and structural phase transitions. We modeled the temperature dependence of magnetization and magnetic entropy change under externally applied magnetic field and pressure and perform the comparison with available experimental data.
This work is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - TRR 270, B06 and Russian Science Foundation (RSF) No. 17-72-20022.