Regensburg 2013 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 50: Poster II
MA 50.54: Poster
Freitag, 15. März 2013, 10:30–13:30, Poster D
Spin motive force induced by moving vortex in magnetic nanostructures — •Ajay Gangwar1, Hans G. Bauer1, Matthias Noske2, Markus Weigand2, Hermann Stoll2, Gisela Schütz2, Georg Woltersdorf1, and Christian H. Back1 — 1University of Regensburg, Regensburg, Germany — 2Max Planck Institute for Intelligent Systems Stuttgart, Germany
Recently, voltage signals due to spin motive force (SMF) have been observed in magnetic elements with a moving magnetic vortex core [1]. However a moving vortex core also represents a change of the magnetic inductance and therefore also leads to a large electro motive force (EMF). An unambiguous separation of EMF and SMF signals is necessary for the interpretation of the SMF voltage. For this reason we simultaneously measure the voltage signal and the position of the moving magnetic texture in a sub-micron permalloy (Py) disk with high temporal and spatial resolution in a scanning X-ray transmission microscope (STXM). In this way we determine directly the phase relation between the obtained voltage signals and the position of the vortex core with respect to the nanoscale voltage probes. This technique allows us to unambiguously separate contributions from EMF (due to the change of magnetic induction) and SMF (due to the moving magnetic texture). We separate EMF and SMF by performing measurements in various configurations and by reversing the vortex core polarity.
[1] K. Tanabe et al., Nature Communications 3, 845 (2012).