Hamburg 2001 – wissenschaftliches Programm

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DS: Dünne Schichten

DS 31: Postersitzung

DS 31.38: Poster

Dienstag, 27. März 2001, 16:30–17:30, Foyer Saal 4

Magnetotransport properties of thin films and multilayers of the Heusler alloys Cu₂MnAl, Co₂MnSb and Co₂MnSi — •Andre Bergmann, Uwe Geiersbach, and Kurt Westerholt — Institut für Experimentalphysik IV Ruhr Universität Bochum 44780 Bochum Germany

Following electronic energy band structure calculations the intermetallic Heusler compounds Co₂MnSi and Co₂MnSb with the L2₁ structure are half metallic ferromagnets with a spin polarization of 100% at the Fermi level. This feature is very rare in metallic ferromagnets and very attractive for applications in spin transport. We report measurements of the electrical conductivity, magnetoresistance and Hall effect on thin films of the Heusler compounds Cu₂MnAl, Co₂MnSb and Co₂MnSi prepared by RF sputtering on MgO (100) and Al₂O₃ a-plane. The residual resistivity of the Co-based Heusler compounds is rather high, indicating the presence of substantial disorder in the crystal lattice. All Heusler ferromagnts exhibit a large anomalous Hall coefficient. First magnetotransport measurements on multilayers of the Heusler compounds with V and Au as nonmagnetic interlayers are reported.