Regensburg 2004 – wissenschaftliches Programm
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MA: Magnetismus
MA 20: Magnetische dünne Schichten II
MA 20.5: Vortrag
Donnerstag, 11. März 2004, 11:15–11:30, H10
Proximity effect of vanadium on spin-density wave magnetism in Cr films — •Evgeny Kravtsov1, Björgvin Hjörvarsson2, Andreas Hoser3, Alexei Nefedov1, Florin Radu1, Arndt Remhof1, and Hartmut Zabel1 — 1Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universisät Bochum, Bochum — 2Department of Physics, Uppsala University, Uppsala, Sweden — 3Institut für Kristallographie, RWTH-Aachen, Aachen
Spin-density wave (SDW) state in thin Cr films is known to be under influence of proximity effects from neighboring layers. To date the main attention has been given to effects arising from exchange interactions at interfaces, for example, in Fe/Cr systems, and few papers are devoted to other types of boundary conditions. Here we report on a combined neutron and X-ray scattering study of proximity effects in Cr/V films where the boundary conditions are due to V-Cr hybridization at interfaces. The neutron measurements have been performed at the triple-axis spectrometer UNIDAS in Forschungszentrum Jülich, the synchrotron measurements at the ID20 beamline in ESRF. From the above experiments, we provide evidence that the V/Cr interface causes a strong and long-range influence on the SDWs behavior in Cr. The V-Cr interface hybridization changes the SDW polarisation and propagation direction as well as the SDW period. The Cr magnetic moment in Cr/V bilayers was found to decrease quasi-linearly with temperature that is not observed so far in bulk Cr and other Cr-based thin film systems. The research was supported by SFB 491 and INTAS.