SKM 2023 – scientific programme
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MA: Fachverband Magnetismus
MA 37: Magnetic Heuslers
MA 37.6: Talk
Thursday, March 30, 2023, 10:45–11:00, HSZ 403
The impact of disorder on the 4O-martensite of Ni-Mn-Sn Heusler alloy — •Martin Friák1, Martin Zelený2,3, Jiří Kaštil4, Jiří Kamarád4, Martin Míšek4, Zdeněk Arnold4, Ilja Turek1, Oldřich Schneeweiss1, and Mojmír Šob5,1 — 1Institute of Physics of Materials, Czech Academy of Science, Brno, CZ — 2Institute of Materials Science and Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Brno, CZ — 3Faculty of Mathematics and Physics, Charles University, Prague, CZ — 4Institute of Physics, Czech Academy of Sciences, Prague, CZ — 5Department of Chemistry, Faculty of Science, Masaryk University, Brno, CZ
We have performed a quantum-mechanical study of thermodynamic, elastic, magnetic and structural properties of four different ferrimagnetic states in Ni1.9375Mn1.5625Sn0.5 martensite. They are modeled by the four-layer modulated 4O structures with Mn-excess atoms randomly distributed in Ni and Sn sublattices. The Mn atoms at the Ni sublattice turn out to play a key role in the system. A reversal of the orientation of their local magnetic moments has a huge impact on the properties of the whole system. The lowest-energy configuration exhibits anti-parallel local magnetic moments of these Mn atoms with respect to the orientation of the total magnetic moment. By testing both elasticity and phonons we conclude that the lowest-energy state is mechanically stable. Vibrational properties of individual atoms are found to be very sensitive to the chemical disorder. For details see Intermetallics 151 (2022) 107708, DOI:10.1016/j.intermet.2022.107708.