Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II - Magnetic Heusler compounds, Magnetic shape memory alloys, Thin Films, Micro-/Nano-structured magnetic materials, Graphene, Spins in organics, Magnetic imaging, Surface Magnetism, Spin excitations/Torque, Spincaloric transport

MA 52.13: Poster

Freitag, 30. März 2012, 11:00–14:00, Poster A

Antisite disordering in new Fe-based tetragonal Heusler compounds characterised by 57Fe-Mössbauer spectroscopy — •Teuta Gasi, Vadim Ksenoofontov, Jürgen Winterlik, and Claudia Felser — Institut für Anorganische und Analytische Chemie, Johannes Gutenberg Universität, Staudinger Weg 9, 55099 Mainz, Germany

We report on magnetic properties and antisite disordering in tetragonal Heusler Compounds investigated by 57Fe-Mössbauer Spectroscopy. These materials are important because of their potential application in spintronic especially for STT (spin-transfer torque) technology, magnetocaloric or STO etc. New tetragonal Heusler compounds based on Fe and Mn were synthesized by arc-melting and characterized. 57Fe transmission and conversion electron Mössbauer spectroscopy (CEMS) was applied to explore magnetism and local surrounding of Fe atoms in bulk samples. Measurements reveal that the magnetic moments of Fe atoms in these compounds are almost vanishing, whereas in the cubic ones magnetic moments are much higher. Taking into account magnetic susceptibility measurements of Mn based compounds, one can conclude that magnetic moments of Mn atoms are mainly responsible for the bulk magnetization. The Mössbauer data support this observation.