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MA: Magnetismus

MA 9: FV-internes Symposium "Heusler-Legierungen" (Organizers: B. Hillebrands, H. Zabel)

MA 9.5: Invited Talk

Friday, March 4, 2005, 17:15–17:45, TU EMH225

Magnetism of [Co₂MnGe/Au]_n and [Co₂MnGe/V]_n multilayers — •K. Westerholt, A. Bergmann, J. Grabis, E. Verduijn, A. Nefetov, and H. Zabel — Experimentalphysik/Festkörperphysik Ruhr-Uni-Bochum 44780 Bochum, Germany

The magnetic behavior of the fully spin polarized Heusler compounds at interfaces with dielectrics and non magnetic metals is essential when judging the perspective of these materials as ferromagnetic layers in typical spintronic devices. We review our results on the magnetic and structural properties of multilayers composed of the fully spin polarized Heusler alloy Co₂MnGe with V or Au as interlayers. In [Co₂MnGe/Au]_n multilayers the interlayers cause an exchange bias shift of the ferromagnetic hysteresis loops at low temperatures. The analysis of the x-ray resonant magnetic reflectivity reveals that the magnetization profile of Mn is definitely different from that of Co and asymmetric with respect to the growth direction of the layers. In [Co₂MnGe/V]_n multilayers with very thin Heusler layers we observe an antiferromagnetic interlayer long range ordering below a well defined Néel temperature originating from the dipolar stray fields of the magnetically rather rough Heusler layer interfaces.