Regensburg 2013 – scientific programme

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MA: Fachverband Magnetismus

MA 50: Poster II

MA 50.35: Poster

Friday, March 15, 2013, 10:30–13:30, Poster D

Dynamic response of periodic magnetic domain patterns in submicron sized Co2MnGe-Heusler wires — •Katherine Gross, Frank Brüssing, Kurt Westerholt, and Hartmut Zabel — Institut für Experimentalphysik/Festkörperphysik, Ruhr-Universität Bochum, D-44780 Bochum,Germany

We have investigated the dynamic response of periodic magnetic domain patterns in submicron sized Co2MnGe-Heusler ferromagnetic wires by measuring the in-phase and out-of phase magnetic susceptibility via the magneto-optical Kerr effect with an ac-magnetic field applied parallel or perpendicular to the wire axis. In magnetic remanence the magnetization in the Co2MnGe wires aligns along the growth induced uniaxial anisotropy axis transverse to the wire axis, forming highly regular domain patterns with 180° domain walls. The application of an ac-field perpendicular to the wire axis results in a oscillating motion of the domain walls (DW) along the wire axis. For small field amplitudes just above the depinning field the DW dynamics can be described by a slide-like motion and an analytical expression can be used to extract the depinning field and the domain wall mobility. When applying the ac-magnetic field along the wire axis the magnetization in the perpendicular domains responses by coherent rotation towards the direction of the wire axis. In both configurations the complex ac-susceptibilty is described by a Cole-Cole type of relaxation time approach.