Regensburg 2010 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 10: Poster I

MA 10.79: Poster

Dienstag, 23. März 2010, 10:45–13:45, Poster A

Magneto-Optic Measurements of Magnetic Multilayers in Extreme Ultraviolet Range — •Roman Adam, Patrik Grychtol, Stefan Cramm, and Claus Schneider — Institute of Solid State Research IFF-9, Research Center Jülich, D-52425

We performed static and time-resolved magneto-optic measurements on Co/Si-wedge/Ni/Fe and NiFe/MgO/Co multilayers using resonant scattering of extreme ultraviolet (XUV) radiation tuned to the M absorption edges of cobalt (60.2 eV) and nickel (67.5 eV). By exploiting the linear magneto dichroic effect close to the Brewster angle a huge magnetic contrast of up to 80% from the top Co and 20 % from the buried NiFe layer upon magnetization reversal could be obtained. In order to map the magnitude of the dichroism, angular and energy dependent scans of the magnetic asymmetry were performed and compared with magneto-optical simulations. The magneto-optical response of a multilayer system to a magnetic pulse excitation results in element-specific oscillations in a frequency range of 3 to 6.5 GHz associated with magnetization dynamics of the individual Co and NiFe layers. Presented results demonstrate the feasibility of element-specific magneto-dynamic studies in magnetic multilayers in XUV spectral range.