SKM 2021 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 15: Posters Magnetism IV
MA 15.29: Poster
Donnerstag, 30. September 2021, 13:30–16:30, P
Structural and magnetic properties of Co(Fe)-Ni-Al(Ga) 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
Ferromagnetic shape memory alloys (FSMA) are promising candidates for application as actuators, sensors, magnetomechanical devices, harvesters, and magnetic cooling systems. In their low-temperature, low-symmetry phases they may also posses a considerable magnetocrystalline anisotropy, which is necessary for the FSMA but may make them useful as low-cost permanent magnets. Co(Fe)-Ni-Al(Ga) alloys are an interesting subgroup, as these materials are ductile, cheap, and easily synthesized, while possessing a high Curie and martensitic transformation temperature. In this work, we report on a systematic first-principles study of the structural and magnetic properties of Co-Ni-Al, Fe-Ni-Al, and Fe-Ni-Ga Heusler alloys. We compared ground state energy and magnetic properties for different structural motives and degree of order and predict the structural stability at zero and finite temperatures.
This work is funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) - TRR 270, B06 and Russian Science Foundation (RSF) No. 17-72-20022.