Dresden 2011 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MA: Fachverband Magnetismus
MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)
MA 63.86: Poster
Freitag, 18. März 2011, 11:00–14:00, P2
Spin excitations in Dy/Y and Gd/Y superlattices — •Alexander Grünwald1, Elena Tartakovskaya2, Andrew Wildes3, Wolfgang Schmidt4, Peter Link5, Astrid Schneidewind6, Gregor Nowak7, Katharina Theis-Bröhl8, Roger Ward9, and Andreas Schreyer1 — 1Helmholtz-Zentrum Geesthacht, Germany — 2Institute for Magnetism of National Ukrainian Academy of Science, Ukraine — 3Institut Laue-Langevin, France — 4IFF, Forschungszentrum Jülich, JCNS at ILL, France — 5Forschungs-Neutronenquelle Heinz Maier-Leibnitz, Germany — 6Helmholtz-Zentrum Berlin / TU Dresden, Germany — 7Ruhr-Universität Bochum, Germany — 8Hochschule Bremerhaven, University of Apllied Sciences, Germany — 9Oxford University, Clarendon Laboratory, United Kingdom
Neutron inelastic measurements of magnetic excitations propagating normal to the interfaces in rare-earth multilayers are presented. The measurements show multiple peak features at different energies for a given momentum transfer, indicating discrete energy modes, and a renormalization of the spin waves with an applied magnetic field on Dy/Y [1] and Gd/Y [2] superlattices, respectively. The results can be quantitatively explained with long-range intralayer and interlayer RKKY exchanges and a significant contribution of the Dzyaloshinsky-Moriya interaction in Dy/Y.
[1] A. T. D. Grünwald et al., Phys. Rev. B, 82, 014426 (2010)
[2] A. T. D. Grünwald et al., Appl. Phys. Lett., 96, 192505 (2010)