Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 55: Poster II

MA 55.29: Poster

Freitag, 4. April 2014, 10:30–13:30, P2

A novel approach on imaging current-induced spinwave dynamics — •Johannes Stigloher, Jean-Yves Chauleau, Hans Bauer, Helmut Körner, Georg Woltersdorf und Christian Back — Department of Physics, Universität Regensburg, D-93040 Regensburg, Germany

The spin transfer torque (STT) has been an active field of experimental and theoretical research for the last 15 years. STT is accessed by evidencing the consequences of an applied electric current on different magnetic textures such as domain walls, vortex cores or magnetostatic spinwaves. The latter, evidenced by the pioneer work of Vlaminck and Bailleul (Science 320, 410 (2008)), has shown the ability of determining the parameters in a self-consistent way on a single sample. After addressing this subject using time-resolved scanning Kerr microscopy (TRMOKE), we present a preliminary work on an alternative approach of optical detection of current-induced spinwave dynamics. The principle of the approach is the modulation at a low frequency of the applied current, associated to a dual Lock-in amplifier detection. It allows a substantial noise reduction and a direct access to the effect of spin-polarized currents on spinwave characteristics. Subsequently, this approach would open the possibility to spatially resolved STT in more complicated spinwave profiles.