Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 12: Focus Session: Terahertz Spintronics
MA 12.1: Topical Talk
Dienstag, 12. März 2013, 09:30–10:00, H10
Ultrafast magnetization enhancement in metallic multilayers driven by superdiffusive spin current — •Roman Adam1, Chan La-O-Vorakiat2, Marco Battiato3, Dennis Rudolf1, Justin M. Shaw44, Emrah Turgut2, Pablo Maldonado3, Stefan Mathias5, Patrik Grychtol2, Hans T. Nembach4, Thomas J. Silva4, Martin Aeschlimann5, Henry C. Kapteyn2, Margaret M. Murnane2, Claus M. Schneider1, and Peter M. Oppeneer3 — 1Peter Grünberg Institut PGI-6, Research Centre Jülich, 52425, Germany — 2Department of Physics and JILA, University of Colorado, Boulder, CO 80309-0440, USA — 3Department of Physics and Astronomy, Uppsala University, Sweden — 4Electromagnetics Division, NIST, Boulder, CO 80305-3328, USA — 5University of Kaiserslautern and Research Center OPTIMAS, 67663, Kaiserslautern, Germany
Combining the femtosecond time resolution with element selectivity in pump-probe experiment we studied the magnetic response of Ni/Ru/Fe trilayers. By exciting the trilayer with infrared laser light we observed the ultrafast magnetization response in the Ni and Fe layers separately using synchronized extreme ultraviolet probe pulses tuned to the 3p absorption edges of Ni and Fe. Following the optical excitation, we detected both magnetization quenching as well as, an unexpected magnetization enhancement in the buried Fe layer. We ascribe the observed response to the optically generated superdiffusive spin currents between the layers [1,2].
[1] D. Rudolf, et al. Nature Commun. 3, 1037 (2012)
[2] M. Battiato, et al. Phys. Rev. Lett. 105, 027203 (2010)