Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 11: Magnetic Materials

MA 11.11: Vortrag

Montag, 23. März 2009, 18:00–18:15, HSZ 103

Hyperfine magnetic field on iron atoms as indication of stoichiometry in Co₂FeSi — •Vadim Ksenofontov¹, Benjamin Balke¹, Claudia Felser¹, Marek Wójcik², Sabine Wurmehl³, Horst Schneider⁴, and Gerhard Jakob⁴ — ¹Institute of Inorganic and Analytical Chemistry, Johannes Gutenberg-University, 55099 Mainz, Germany — ²Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warszawa, Poland — ³Department of Applied Physics, Physics of Nanostructures, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlands — ⁴Institute of Physics, Johannes Gutenberg - University, 55099 Mainz, Germany

The Heusler compound Co₂FeSi is a promising half-metallic material for thin films spintronic applications. Among the factors reducing spin-polarization, the defects and antisite disordering in such materials play a crucial role. To clarify effects of the non-stoichiometry, the continuous series of model solid solutions Co_3−xFe_xSi (0.96 < x < 1.4) was investigated by ⁵⁷Fe Mössbauer spectroscopy and ⁵⁹Co nuclear magnetic resonance. It has been shown that hyperfine magnetic fields on Fe can be used to monitor a non-stoichiometry in Co₂FeSi-based bulk samples and thin films.

The authors gratefully acknowledge financial support by the DfG (Research Unit 559).