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MA: Fachverband Magnetismus

MA 22: Magnetic Measurement Methods

MA 22.3: Talk

Tuesday, March 15, 2011, 11:30–11:45, HSZ 403

Element-selective measurement of magnetic multilayers using a tabletop high-harmonic soft X-ray source. — •Roman Adam¹, Patrik Grychtol¹, Dennis Lvovsky¹, Chan La-O-Vorakiat³, Stefan Mathias^2,3, Moritz Plötzing¹, Justin Shaw⁴, Hans Nembach⁴, Tom Silva⁴, Timm Rohwer⁵, Martin Aeschlimann², Henry Kapteyn³, Margaret Murnane³, and Claus Schneider¹ — ¹Institute of Solid State Research, Research Centre Jülich, Jülich, Germany — ²TU Kaiserslautern und Forschungszentrum OPTIMAS, Kaiserslautern, Germany — ³Department of Physics and JILA,University of Colorado, Boulder, CO, USA — ⁴Electromagnetics Division, National Institute of Standards and Technology, Boulder, CO, USA — ⁵Institute of Experimental and Applied Physics, University Kiel, Kiel, Germany

We performed static and time-resolved magneto-optic measurements on Ni/Ru/Fe and Ni/Cr/Fe multilayers using resonant scattering of laser-generated extreme ultraviolet (XUV) radiation tuned to the M absorption edges of Fe (53eV) and Ni (67eV). By exploiting the linear magneto dichroic effect a clear element selective magnetic contrast upon magnetization reversal can be obtained[1]. Our experiments show that the laser-generated higher harmonics can be employed for element-selective probing of magnetic multilayers with femtosecond time resolution, thus demonstrating a new experimental approach to measure ultrafast spin dynamics in heterogeneous magnetic systems. [1] C. La-O-Vorakiat et al., PRL 103, 257402 (2009.