Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 14: Magnetization / Demagnetization Dynamics II
MA 14.8: Vortrag
Montag, 20. März 2017, 17:00–17:15, HSZ 401
Effect of spin-orbit coupling on femtosecond spin dynamics in NiPd magnetic alloys — •Seung-gi Gang1, Roman Adam1, Moritz Plötzing1, Moritz von Witzleben1, Christian Weier1, Daniel E. Bürgler1, Pablo Maldonado3, Stefan Mathias4, Martin Aeschlimann2, Peter M. Oppeneer3, and Claus M. Schneider1 — 1Peter Grünberg Institut PGI-6, Research Centre Jülich, 52425 Jülich, Germany — 2Department of Physics and Research Center OPTIMAS, TU Kaiserslautern, 67663 Kaiserslautern, Germany — 3Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden — 4Georg-August-Universität Göttingen, I. Physikalisches Institut, 37077 Göttingen, Germany
We studied optically-induced femtosecond spin dynamics in NixPd1-x magnetic alloys with laser pulses (1.55 eV) by recording the time evolution of the transversal magneto optical Kerr effect (T-MOKE) signal at Ni M2,3- and Pd N2,3-absorption edges using extreme ultraviolet (20 to 72 eV) pulses. In static measurements, the Pd subsystem show an magnetic asymmetry with an opposite sign compared to the ferromagnetic Ni. Dynamics of the Ni-subsystem show that increase of the Pd concentration results in a drop of the demagnetization time τM. The decreased τM cannot be explained by the simple τM ~ u/TC scaling, which is typically observed in single-species materials by considering only magnetic moment u and Curie temperature TC. However, the observed behavior can be well understood within a spin-flip scattering framework, if changes of the spin-flip probability due to the enhanced spin-orbit coupling of the heavy Pd atoms is considered.