Regensburg 2007 – scientific programme
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MA: Fachverband Magnetismus
MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)
MA 15.71: Poster
Tuesday, March 27, 2007, 15:00–19:00, Poster A
Spin structure investigations of domain walls in nanoscale constrictions — •Dirk Backes1,2, Laura Heyderman1, Christian David1, Mathias Kläui2, Friederike Junginger2,4, Henri Ehrke2,4, Ulrich Rüdiger2, Caros Vaz3, Tony Bland3, Cheng-Shi Chen4, Takeshi Kasama4, and Rafal Dunin-Borkowski4 — 1Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, Switzerland — 2FB Physik, Universität Konstanz — 3Cavendish Laboratory, University of Cambridge, UK — 4Department of Materials Science and Metallurgy, University of Cambridge, UK
Domain walls of ferromagnetic curved-line elements exhibit two spin-configurations - the vortex and the transverse wall type. If a notch is included forming a constriction, transverse walls get pinned inside of the constrictions and vortex walls in the vicinity of the notch [1]. We report on the fabrication of such elements on membranes with constrictions as small as approx. 30 nm [2]. Electron holography is the ideal technique to study the spin-structure near and in these constrictions because it is able to visualize the magnetic induction with a resolution below 5 nm. Concentrating on transverse walls we systematically determine the shape which could be either symmetrical or asymmetrical depending on the geometry. We characterize the transverse wall by its opening angle and compare the experimental data with simulations.
[1] M. Kläui et al., Appl. Phys. Lett. 87, 102509 (2005)
[2] D. Backes et al., Microelectron. Eng. 83, 1726 (2006)