Berlin 2005 – scientific programme

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MA: Magnetismus

MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65

MA 20.117: Poster

Monday, March 7, 2005, 14:00–18:00, Poster TU C

Spin structure of domain walls in ferromagnetic ring magnets — •M. Laufenberg¹, M. Kläui¹, D. Bedau¹, U. Rüdiger¹, C.A.F. Vaz², J.A.C. Bland², L.J. Heyderman³, D. Backes^1,3, F. Nolting³, E. Bauer⁴, S. Cherifi⁴, S. Heun⁴ und A. Locatelli⁴ — ¹Fachbereich Physik, Universität Konstanz, Germany — ²Cavendish Laboratory, University of Cambridge, U.K. — ³Paul-Scherrer-Institut, 5232 Villigen, Switzerland — ⁴Sincrotrone Trieste, 34012 Basovizza, Italy

The spin structure of domain walls (DW) in ferromagnetic rings has been studied by high-resolution photoemission electron microscopy for various ring widths (110-1800 nm), thicknesses (2-38 nm), and materials (permalloy, Co).

Experimental phase diagrams show transitions between transverse and vortex walls [1]. Micromagnetic simulations reproduce the experimental results for Co rings very well while in permalloy rings an unexpected second phase boundary at ultralow thicknesses is observed.

By varying the edge-to-edge spacing, the influence of dipolar DW coupling on the DW spin structure is studied. Furthermore, a linear dependence of the DW width on the ring width is found.

[1] M. Kläui et al., Appl. Phys. Lett., in press