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MA: Fachverband Magnetismus

MA 9: Magnetic Materials I

MA 9.1: Vortrag

Montag, 14. März 2011, 14:45–15:00, HSZ 401

Magnetoresistance and Anomalous Hall Effect of Ferromagnetic Half-Metallic Heusler Compound Co₂FeSi — •Dirk Bombor, Oleg Volkonskyi, Christian G. F. Blum, Steven Rodan, Mahmoud Abdel-Hafiez, Anja Wolter, Sabine Wurmehl, Christian Hess, and Bernd Büchner — Leibnitz Institute for Solid State and Materials Research, IFW Dresden, Germany

Electronic transport properties of the Heusler Compound Co₂FeSi have been studied. This compound is a soft ferromagnet which is predicted to be half-metallic — this means complete spin polarization of the conducting electrons. Its resistivity behaviour in dependence of the temperature is typical for ferromagnetic compounds, and is dominated by scattering of the charge carriers at spin fluctuations. This scattering is suppressed at low temperatures due to an energy gap where this gap can be attributed to the half-metallic property of this compound. A positive magnetoresistance at low temperatures and a negative magnetoresistance at high temperatures has been observed as well as an anomalous Hall effect which is found to be driven by scattering of conducting electrons at magnetic scattering centres.