Highly ordered, half-metallic Co2FeSi single crystals
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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 Co2 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. © 2009 American Institute of Physics.
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. H., Jacobs, P. J., Kohlhepp, J. T., & Swagten, H. J. M. (2009). Highly ordered, half-metallic Co2FeSi single crystals. Applied Physics Letters, 95(16), 161903-1/3. . https://doi.org/10.1063/1.3242370