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MA: Fachverband Magnetismus
MA 45: Spin Structures and Magnetic Phase Transitions II
MA 45.3: Talk
Thursday, March 21, 2024, 15:30–15:45, EB 407
Tuning Magnetism in Epitaxial (Cr1−xMnx)2GaC MAX Phase Films: Insights into Stoichiometry and Chemical Disorder — •Ivan Tarasov, Hanna Pazniak, Olga Miroshkina, Michael Farle, and Ulf Wiedwald — University of Duisburg-Essen
MAX phases promise quasi-2D highly anisotropic magnetic properties due to their nanolaminated structure, tunable chemistry, and high oxidation resistance. Here, we study the (Cr1−xMnx)2GaC MAX phase system with 0 ≤ x ≤ 1 aiming to fine-tune magnetic responses through stoichiometric adjustments. High-quality epitaxial thin films (thickness 25 to 75 nm) are grown on rigid MgO(111), Al2O3(0001), and flexible muscovite KAl3Si3O10(OH)2(001) substrates by pulsed laser deposition. The structural characterization reveals a competition between (Cr1−xMnx)2GaC MAX phase and competing phases, which is mitigated by optimizing the growth conditions. Vibrating sample magnetometry indicates an overall trend of increasing magnetization and ordering temperature with higher Mn content. The broad transition towards the paramagnetic phase within up to 150 K, however, for different (Cr1−xMnx)2GaC MAX phase films are explained by local chemical order on M sites, as supported by first-principles calculations and Monte Carlo simulations within the Heisenberg model.
Acknowledgements
Funding by the Deutsche Forschungsgemeinschaft (DFG) within CRC/TRR 270, project B02 (Project-ID 405553726) is gratefully acknowledged.
Keywords: MAX phase; Pulsed Laser Deposition; Epitaxy; Monte Carlo simulation; first-principles calculations