Berlin 2015 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
MA: Fachverband Magnetismus
MA 32: Spin Structures and Magnetic Phase Transitions
MA 32.5: Talk
Wednesday, March 18, 2015, 16:00–16:15, EB 202
Structural, magnetic and magneto-optical properties of Mn2NiSn and Fe-Ni-Sn compounds — Michaela Tomíčková1, Lukáš Beran2, Petr Cejpek2, Jaromír Kopeček3, Oleg Heczko3, Dominik Legut1, Rastislav Varga4, Václav Holý2, Martin Veis2, and •Jaroslav Hamrle1 — 1VSB-Technical University of Ostrava, Czech Republic — 2Charles University in Prague, Czech Republic — 3Institute of Physics, ASCR, Prague, Czech Republic — 4UPJŠ Košice, Slovakia
Heusler compounds are well-known as exceptionally tunable materials by suitable element substitution. Here we present study of structural (XRD, SEM, EDX), magnetic (SQUID) optical and magneto-optical (ellipsometry, MOKE spectroscopy) properties of Mn2NiSn cubic Heusler and Fe-Ni-Sn hexagonal compounds. Physical properties were studied with respect to the material composition and post deposition treatment. The samples were prepared by repeated arc melting of stoichiometric amounts of high-purity elements in argon atmosphere. Selected alloys were then subsequently annealed at 1200∘C, however effect of annealing was found negligible. In case of Fe-Ni-Sn, only hexagonal (P63/mmc) Fe2Ni3Sn3 was found to exhibit ternary phase. Spectral dependencies of complete permittivity tensor of studied materials in the photon energy range from 1.5 to 5 eV were deduced from ellipsometric and MOKE measurements. These dependencies were confronted with ab-initio calculations to obtain the information about the electronic structure of studied compounds. Supported by Grant Agency of Czech Republic 13-30397S.