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DS: Fachverband Dünne Schichten
DS 13: Layer Deposition II: Deposition Methods
DS 13.5: Vortrag
Montag, 16. März 2020, 17:45–18:00, CHE 89
Epitaxial growth of Cr2AlC MAX phase thin films by pulsed laser deposition — •Marc Stevens, Alexander Jemiola, Michael Farle, and Ulf Wiedwald — Faculty of Physics and Center for Nanointegration Duisburg-Essen, University of Duisburg-Essen, Germany
MAX phases (Mn+1AXn) are ternary or quaternary compounds of layered hexagonal structures, where M is an early transition metal, A is an A group element and X is either C or N [1]. Within the last years, much attention is put on magnetic MAX phases with Cr and/or Mn as two possible M elements. The magnetic properties of such (M1xM21−x)2AX phases are driven by competing ferromagnetic and antiferromagnetic correlations leading to complicated phase diagrams [2,3]. One parent compound of such MAX phases is Cr2AlC. In this work, we show the first successful synthesis of epitaxial Cr2AlC films on MgO (111) substrates by pulsed laser deposition (PLD) at film thicknesses of 10-50 nm. The epitaxial relation is Cr2AlC (0001) || MgO (111) in the growth direction and Cr2AlC [1120] || MgO [101] in the film plane. We compare the growth of Cr2AlC on MgO(111) and Al2O3(0001) and discuss the impact on the magnetic properties. Funding by the Deutsche Forschungsgemeinschaft (DFG) within the CRC/TRR 270 is gratefully acknowledged.
[1] M. W. Barsoum, Prog. Solid State Chem. 28, 201 (2000). [2] A. S. Ingason, M. Dahlqvist, and J. Rosen, J. Phys.: Condens. Matter 28, 43 (2016). [3] Iu. Novoselova et al., Sci. Rep. 8, 2637 (2018).