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 20.23: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Onset of spin-density-wave magnetism in Cr/V superlattices — •E. Kravtsov¹, B. Hjörvarsson², A. Hoser³, G. McIntyre⁴, L. Paolasini⁵, A. Nefedov¹, A. Remhof¹, F. Radu¹, and H. Zabel¹ — ¹Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universisẗ Bochum, Bochum, Germany — ²Department of Physics, Uppsala University, Uppsala, Sweden — ³Institut für Kristallographie, RWTH-Aachen, Aachen, Germany — ⁴Institut Laue-Langevin, Grenoble, France — ⁵ESRF, Grenoble, France

Spin-density wave (SDW) state in thin Cr films is known to be under influence of dimensionality (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 of the incommensurate SDW scales with Cr thickness as well. The research was supported by SFB 491.