Berlin 2015 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: POSTER Ia
MA 19.50: Poster
Dienstag, 17. März 2015, 09:30–13:00, Poster A
Suppression of magnetic order in epitaxial Mn1−xFexSi thin films — •Patricia Herbst, Josefin Engelke, David Schroeter, and Dirk Menzel — Institut für Physik der Kondensierten Materie, Technische Universität Braunschweig, Mendelssohnstr. 3, 38106 Braunschweig, Germany
The chiral magnet MnSi, which crystallizes in the cubic B20 structure and has evoked much interest due to the existence of skyrmions, orders magnetically below T = 29.5 K. The magnetic order can be suppressed by iron doping and vanishes completely for a Fe substitution of 15% in bulk material. Thin films of the B20 magnets, however, are known to show different magnetic properties, which are modified due to strain and film anisotropy. Therefore, we have investigated epitaxial Mn1−xFexSi grown on Si(111) substrate by molecular beam epitaxy. A first series of samples was prepared by codeposition and a second series was codeposited and additionally annealed afterwards. The properties of these two different types of films are compared and discussed. For all films with Fe doping a decreased ordering temperature is observed and the complete suppression of magnetic order is investigated. At low temperature a Kondo minimum masks the possibly occurring deviation from the T2-law, which is known from bulk material and which corresponds to non-Fermi liquid behavior.