1. Highly ordered, half-metallic Co2FeSi single crystals.
- Author
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Blum, C. G. F., Jenkins, C. A., Barth, J., Felser, C., Wurmehl, S., Friemel, G., Hess, C., Behr, G., Büchner, B., Reller, A., Riegg, S., Ebbinghaus, S. G., Ellis, T., Jacobs, P. J., Kohlhepp, J. T., and Swagten, H. J. M.
- Subjects
CRYSTALLOGRAPHY ,CRYSTALS ,ELECTRIC resistance ,MAGNETIC fields ,POWDERS - Abstract
A wide variety of properties such as half-metallicity is found among Heusler compounds. In order to separate intrinsic and extrinsic properties, high quality single crystals are required. Here, we report on differently grown crystals of the half-metallic ferromagnet Co
2 FeSi. All crystals show excellent ordering, resulting in outstanding electrical behavior with low residual resistivity and high residual-resistivity-ratio. All Co2 FeSi crystals show a plateau in the resistivity below 50 K, which might point to half-metallic ferromagnetism. The cross-over from this unusual to more conventional transport (T2 dependence) around 50 K indicates the onset of spin flip scattering and thus is indispensable for understanding the strong temperature dependence of Co2 FeSi tunneling magnetoresistance-devices. [ABSTRACT FROM AUTHOR]- Published
- 2009
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