Dresden 2006 – wissenschaftliches Programm
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MA: Magnetismus
MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)
MA 20.19: Poster
Dienstag, 28. März 2006, 15:15–19:15, P1
Magneto-Optical Ellipsometry on Ni2MnIn and NiMnIn Heusler Alloys — •Gerd Neuber, Jan Scholtyssek, Ulrich Merkt, Michael Rübhausen, and Guido Meier — Institut für Angewandte Physik und Zentrum für Mikrostrukturforschung, Universität Hamburg, Jungiusstraße 11, 20355 Hamburg
We use generalized magneto-optical ellipsometry [1,2] for measurements of the complete dielectric tensor of Ni2MnIn [3] and NiMnIn Heusler alloys in the energy range from 1.6 eV to 5.5 eV and in the temperature range from 50 K to 450 K. Generalized magneto-optical ellipsometry allows the investigation of spin-polarized states and to understand the coupling between spin and charge degrees of freedom. We show differences in the metallic behavior of the semi-Heusler alloy NiMnIn and the full-Heusler alloy Ni2MnIn related to the half-metallic ferromagnetism of the latter one. The polycrystalline Ni2MnIn and NiMnIn films were co-evaporated from two independent sources of Ni and MnIn on a Si(100) substrate under UHV conditions. The Ni2MnIn alloy exhibits the ordered L21 crystalline structure and the NiMnIn alloy has a C1b structure.
[1] A. Berger and M. Pufall, Appl. Phys. Lett. 71, 965 (1997)
[2] R. Rauer, G. Neuber, J. Kunze, J. Bäckström, and M. Rübhausen, Rev. Sci. Instr. 76, 023910 (2005)
[3] S. von Oehsen, J.M. Scholtyssek, C. Pels, G. Neuber, R. Rauer, M. Rübhausen, and G. Meier et al., JMMM 290, 1371 (2005)