Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 11: Ultrafast magnetism II
MA 11.2: Vortrag
Montag, 12. März 2018, 15:15–15:30, EB 407
Energy-resolved ultrafast charge, spin and orbital dynamics in [Co/Pd] multilayers — •Loïc Le Guyader1,2, Daniel Higley1, Tianmin Liu1, Zhao Chen1, Tyler Chase1, Patrick Granitzka1, Giacomo Coslovich1, Alberto Lutman1, Georgi Dakovski1, William Schlotter1, Padraic Shafer3, Elke Arenholz3, Olav Hellwig4, Stefano Bonetti5, Matteo Pancaldi5, Mark Lalieu6, Bert Koopmans6, Joachim Stöhr1, Alexander Reid1, and Hermann Dürr1 — 1SLAC, Menlo Park, USA — 2European XFEL GmbH, Schenefel, Germany — 3ALS, LBNL, Berkley, USA — 4TU Chemnitz and HZDR, Germany — 5Stockholm University, Sweden — 6TU Eindhoven, The Netherlands
The ultrafast demagnetization is a fundamental problem of modern magnetism, with its microscopic origin remaining intensely debated. Particularly, the role played by the spin-orbit interaction in the moment dissipation to the lattice and that of the exchange interaction in the collapse of long-range order call for measurements capable of resolving the charge, spin and the orbital moment dynamics energy resolved. Here we use soft X-ray Absorption Spectroscopy (XAS) with femtosecond X-ray produced by the Linac Coherent Light Source (LCLS) to probe charge and band structure dynamics around the Fermi energy EF in a [Co/Pd] magnetic multilayer. Comparing XAS changes at both L3 and L2 absorption edges below and above EF highlights the role played by the 3d5/2 states. Using X-ray Magnetic Circular Dichroism (XMCD), we further discuss the spin and orbital moment dynamics with respect to the energy resolved charge dynamics.