Berlin 2012 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 52: Poster II - Magnetic Heusler compounds, Magnetic shape memory alloys, Thin Films, Micro-/Nano-structured magnetic materials, Graphene, Spins in organics, Magnetic imaging, Surface Magnetism, Spin excitations/Torque, Spincaloric transport

MA 52.45: Poster

Freitag, 30. März 2012, 11:00–14:00, Poster A

Direct Imaging of Precessional Domain Wall Propagation in Ferromagnetic Rings Induced by Circular Magnetic Fields — A. Bisig^1,2,3, •M. A. Mawass^1,4, M. Stärk^1,3, C. Moutafis^1,3, J. Rhensius^3,5, J. Heidler², M. Curcic², E. Prabu², M. Noske², M. Weigand², T. Tyliszczak⁵, B. Van Waeyenberge⁶, H. Stoll², G. Schütz², and M. Kläui^1,3,4 — ¹Paul Scherrer Institut, Villigen, Switzerland — ²Max-Planck-Institut für Intelligente Systeme, Stuttgart, Germany — ³Universität Konstanz, Konstanz, Germany — ⁴Johannes Gutenberg-Universität Mainz, Mainz, Germany — ⁵Advanced Light Source, LBNL, Berkeley, USA — ⁶Ghent University, Ghent, Belgium

The controlled displacement of magnetic domain walls (DW) along magnetic nanostructures is a key prerequisite to memory storage or DW logic devices. Depending on the strength of the driving force (magnetic field or spin-polarized currents), the propagation of DW changes from simple translation to more complex precessional modes, i.e. periodic transformations of vortex DWs into transverse DWs and back during propagation. We present direct experimental visualization of the precessional motion of vortex DWs in permalloy nanorings controlled by circular fields. Employing scanning transmission x-ray microscopy (STXM) we image the propagation of a pair of vortex DWs in a stroboscopic measurement scheme. We find that the DW velocity strongly varies during the transformation processes and that the propagation and DW spin structures are highly reproducible indicating the direct observation of the Walker breakdown.