Berlin 2015 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 32: Spin Structures and Magnetic Phase Transitions

MA 32.5: Vortrag

Mittwoch, 18. März 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.