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Magnetismus Poster: Do., 13:00–15:30 D-P231
Onset of spin-density-wave antiferromagnetism in Cr/V multilayers
Evgeny Kravtsov 1,2 , Björgvin Hjörvarsson 3 , Andreas Hoser 4,5 , Andreas
Liebig 3 , Gary McIntyre 6 , Alexei Nefedov 7 , Florin Radu 7 , Arndt Remhof 7 ,
Flora Yakhou 8 , Hartmut Zabel 7
1 Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439,
USA – 2 Institute of Metal Physics, Ekaterinburg 620041, Russia – 3 Department of
Physics, Uppsala University, SE-75121 Uppsala, Sweden – 4 Institut fuer Kristallographie,
RWTH-Aachen, D-52056 Aachen, Germany – 5 Institut fuer Festkoerperforschung,
Forschungszentrum Juelich, D-52425 Germany – 6 Institut Laue-
Langevin, B.P. 156, F-38042 Grenoble Cedex 9, France – 7 Institut fuer Experimentalphysik/Festkoerperphysik,
Ruhr-Universitaet Bochum, D-44780 Bochum, Germany
– 8 European Synchrotron Radiation Facility, F-38000, Grenoble, France
Spin-density wave (SDW) state in thin Cr films is known to be under influence of
dimensional (film thickness) and proximity effects from neighboring layers. Here we
report on a combined neutron and X-ray scattering study of these effects in a series
of Cr/V superlattices with different Cr layer thicknesses. The neutron measurements
have been performed at UNIDAS (Forschungszentrum Jülich) and D10 (ILL) instruments,
the synchrotron measurements at the ID20 beamline in ESRF. From the above
experiments we provide a systematical description of the onset of the SDW state in the
system. It was found that Cr/V superlattices are non-magnetic for Cr layers thinner
than 120 ˚A. At this thickness a commensurate SDW originates and as Cr thickness
increases further a fraction of incommensurate SDW appears and expands. Finally the
SDW becomes completely incommensurate. The Neel temperature and SDW period
of the incommensurate SDW were found to scale with the Cr thickness as well. The
research was supported by SFB 491 and INTAS project ref. No. 03-51-4778.
Fig. 1: Neutron scattering scans from the
sample Cr(500˚A)/V taken in the L direction
around the Cr(010) position.