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Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)

MA 63.27: Poster

Friday, March 18, 2011, 11:00–14:00, P2

Ferrimagnetism and disorder in epitaxial (Mn1−xCox)2VAl thin films — •Markus Meinert1, Jan-Michael Schmalhorst1, Günter Reiss1, and Elke Arenholz21Dünne Schichten und Physik der Nanostrukturen, Fakultät für Physik, Universität Bielefeld, 33501 Bielefeld, Deutschland — 2Advanced Light Source, Lawrence Berkeley National Laboratory, CA 94720, USA

Thin films of the quarternary full Heusler compound (Mn1−xCox)2VAl were prepared by DC and RF magnetron co-sputtering on heated MgO (001) substrates. The magnetic structure was examined by x-ray magnetic circular dichroism and the chemical disorder was characterized by x-ray diffraction. For x=0.5 a full compensation of the magnetic moments is expected according to the Slater-Pauling rule m = NV − 24. Ferrimagnetic coupling of V to Mn was observed for Mn2VAl (x=0) and x=0.25. For x=0.25, we also found ferrimagnetic order with V and Co antiparallel to Mn. The experimental results are interpreted with the help of band structure calculations. The total magnetic moment is strongly reduced in Mn2VAl because of preferential D03-like Mn-Al disorder. Co2VAl is only B2 ordered and has reduced magnetization. In the cases with x≥0.45 conventional ferromagnetism was observed, closely related to the atomic disorder in these compounds.

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