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MA: Fachverband Magnetismus

MA 19: Poster I (Bio- and Molecular Magnetism/ Magnetic Particles and Clusters/ Micro- and Nanostructured Magnetic Materials/ Magnetic Materials/ Multiferroics/ Magnetic Shape Memory Alloys/ Electron Theory of Magntism/ Spincaloric Transport/ Magnetic Coupling and Exchange Bias/ Magnetization Dynamics/ Micromagnetism and Computational Magnetics)

MA 19.104: Poster

Tuesday, March 15, 2011, 10:45–13:00, P2

Ultrafast, Element-Specific, Demagnetization Dynamics Probed using Coherent High Harmonic Beams — •Steffen Eich¹, Stefan Mathias^1,2, Chan La-O-Vorakiat², Patrik Grychtol³, Roman Adam³, Mark Siemens², Justin M. Shaw⁴, Hans Nembach⁴, Timm Rohwer⁵, Claus M. Schneider³, Tom Silva⁴, Martin Aeschlimann¹, Margaret M. Murnane², and Henry C. Kapteyn² — ¹Department of Physics and Resarch Center OPTIMAS, University of Kaiserslautern, Germany — ²JILA, University of Colorado and NIST, Boulder, Co, USA — ³Institute of Solid State Research, IFF-9, FZ Jülich, Germany — ⁴Electromagnetics Division, NIST, Boulder, Co, USA — ⁵Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, Germany

Element-specific magnetization dynamics on nanometer length and femtosecond time scales is a topic of intense interest. Ultrafast, coherent, table-top, x-ray sources based on high-harmonic upconversion of femtosecond lasers provide a new tool to study how magnets work at the shortest time and length scales, with element specificity [1]. Here, we use this new experimental capability to extract element-specific demagnetization dynamics and hysteresis loops of Fe and Ni in Permalloy.

[1] La-o-vorakiat et al., PRL 103, 257402 (2009)