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Berlin 2012 – scientific programme

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MA: Fachverband Magnetismus

MA 15: Magnetization / Demagnetization Dynamics I

MA 15.12: Talk

Tuesday, March 27, 2012, 12:45–13:00, H 1012

Magnetization Dynamics in FeCuNi and FeRuNi Multilayers - Influence of the Spacer Layer — •Roman Adam1, Dennis Rudolf1, Chan La-O-Vorakiat2, Patrik Grychtol1, Bastian Heller1, Emrah Turgut2, Stefan Mathias3, Moritz Plötzing1, Zbigniew Celinski4, Justin Shaw5, Hans Nembach5, Tom J. Silva5, Martin Aeschlimann3, Henry Kapteyn2, Margaret Murnane2, and Claus M. Schneider111Peter Grünberg Institut, PGI-6, Forschungszentrum Jülich, 52425, Jülich, Germany — 2Department of Physics and JILA, University of Colorado, Boulder, CO, USA — 3TU Kaiserslautern und Forschungszentrum OPTIMAS, Kaiserslautern, Germany — 4Center for Magnetism and Magnetic Nanostructures, UCCS, Colorado Springs, CO 80918, USA — 5Electromagnetics Division, NIST, Boulder, CO, USA

We performed time-resolved pump-probe measurements on Ni/Ru/Fe and Ni/Cu/Fe multilayers, testing magnetization dynamics on the femtosecond time scale using either visible or extreme ultraviolet (XUV) radiation, as a probe. In the latter experiments, laser-generated XUV radiation was tuned to the M absorption edges of Fe (53eV) and Ni (67eV). By exploiting strong signal enhancement at these resonance conditions, we obtained a clear element- and layer-selective magnetic contrast upon magnetization reversal of magnetic layers comprising the multilayers. Our measurements demonstrate that laser-based high-harmonic experiments employing XUV wavelengths can yield layer-selective information about the magnetization, contributing to detailed understanding of femtosecond switching in magnetic multilayers.

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