Highly ordered, half-metallic Co2FeSi single crystals

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.; Swagten, H. J. M.

doi:10.1063/1.3242370

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Highly ordered, half-metallic Co₂FeSi single crystals

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Blum, C. G. F., Jenkins, C. A., Barth, J., Felser, C., Wurmehl, S., Friemel, G., et al. (2009). Highly ordered, half-metallic Co₂FeSi single crystals. Applied Physics Letters, 95(16), 1-3. doi:10.1063/1.3242370.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0018-9E50-5

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 Co2FeSi. All crystals show excellent ordering, resulting in outstanding electrical behavior with low residual resistivity and high residual-resistivity-ratio. All Co2FeSi 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 Co2FeSi tunneling magnetoresistance-devices.