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MA: Fachverband Magnetismus
MA 43: Magnetization Dynamics II of 3
MA 43.7: Vortrag
Donnerstag, 14. März 2013, 16:30–16:45, H22
Controlling the Competition between Optically Induced Ultrafast Spin-Flip Scattering and Spin Transport in Magnetic Multilayers — •S. Mathias1, E. Turgut2, C. La-o-vorakiat2, J. M. Shaw3, P. Grychtol2, H. T. Nembach3, D. Rudolf4, R. Adam4, M. Aeschlimann1, C. M. Schneider4, T. J. Silva3, M. M. Murnane2, and H. C. Kapteyn2 — 1TU Kaiserslautern and Research Center OPTIMAS, 67663 Kaiserslautern, GER — 2JILA, University of Colorado, Boulder, USA — 3NIST, Boulder, USA — 4Peter Grünberg Institut, Research Centre Jülich, 52425, Jülich, GER
The study of ultrafast dynamics in magnetic materials provides rich opportunities for greater fundamental understanding of correlated phenomena in solid-state matter, because many of the basic microscopic mechanisms involved are as-yet unclear and are still being uncovered. Recently, two different possible mechanisms have been proposed to explain ultrafast laser induced magnetization dynamics: spin-flip scattering and superdiffusive spin transport. In this work, we use multilayers of Fe and Ni with different metals and insulators as the spacer material to conclusively show that both optically induced demagnetization, due to spin scattering processes, and spin-currents contribute simultaneously to ultrafast dynamics in magnetic materials. Moreover, we can control the competition between these two processes, and in some cases completely suppress interlayer spin currents as a sample undergoes rapid demagnetization. Finally, by reversing the order of the Fe/Ni layers, we experimentally show that spin-currents are directional in our samples, predominantly flowing from the top to the bottom layer.