Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.5: Poster
Donnerstag, 15. März 2018, 15:00–18:00, Poster C
Element-selective investigation of femtosecond spin dynamics in NiPd magnetic alloys using extreme ultraviolet radiation — •Seung-gi Gang1, Roman Adam1, Moritz Plötzing1, Moritz von Witzleben1, Christian Weier1, Umut Parlak1, Daniel E. Bürgler1, Jan Rusz2, Pablo Maldonado2, Peter M. Oppeneer2, and Claus M. Schneider1 — 1Peter Grünberg Institut PGI-6, Research Centre Jülich, 52425, Jülich, Germany — 2Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-75120 Uppsala, Sweden
We studied the influence of spin-orbit coupling on femtosecond spin dynamics in NiPd alloys by optically pumping the system with infrared (1.55eV) laser pulses and subsequent recording of the transient resonant reflectivity using synchronized extreme ultraviolet light. The measurements were performed in the transversal magneto-optical Kerr effect geometry. The measurements with XUV light enables separate, but simultaneous detection of spin dynamics in the elemental subsystems with femtosecond time resolution. In static measurements, we measured an induced bipolar magnetic asymmetry of the Pd subsystem due to exchange coupling of the Pd subsystem to the ferromagnetic Ni subsystem. In dynamic measurements, we observed spin dynamics in Ni0.5Pd0.5 at both the Ni- and Pd-edges with element selectivity. Increasing the Pd concentration results in a shorter demagnetization time. Here, spin-flip scattering probability plays a critical role in the control of the demagnetization time. The observed behavior is ascribed to an increase of the Pd-mediated SOC in the system.