Berlin 2008 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 18: Poster I : Bio Magn. (1-2); Mag.Imgaging (3-9); Magn. Semiconductors (10-16); Half Metals & Oxides (17-20); Coupl.Phenomena (21-27); Magn. Mat. (28-41); Micro & Nanostr. Magn. Materials (42-61); Micro Magn. (62-64); Surface Magnetism (65-70); Transport Phenomena (71-85)
MA 18.51: Poster
Dienstag, 26. Februar 2008, 15:15–18:30, Poster E
Investigations of confined domain walls in nanoscale constrictions — •Jan Rhensius1,2, Dirk Backes1,2, Laura Heyderman1, Christian David1, Mathias Kläui2, Christine Schieback2, Peter Nielaba2, Friederike Junginger2,3, Henri Ehrke2,3, Ulrich Rüdiger2, Takeshi Kasama3, and Rafal Dunin-Borkowski3 — 1Laboratory for Micro- and Nanotechnology, Paul Scherrer Institut, Switzerland — 2FB Physik, Universität Konstanz — 3Department of Materials Science and Metallurgy, University of Cambridge, UK
Magnetic domain walls in curved-line elements can exhibit a vortex or transverse wall spin structure. A notch forms a constriction, which pins TW inside the constriction and the VW adjacent to the notch [1]. Such elements were fabricated on membranes with constrictions as narrow as 30 nm [2]. Electron holography is used to study the spin-structure around the constriction with a spatial resolution below 5 nm. The shape of the walls depends on the geometry which we characterize systematically. In total three different spin configurations were found, depending on the size of the constriction and the element width. Symmetric and asymmetric TW were found for narrow constrictions, VW were found for wider constrictions. The width of the domain walls was found to depend on the constriction and decreases with decreasing constriction width super linearly [3]. The experimental data was compared with micromagnetic simulations using a Heisenberg model.
[1] M. Kläui et al., Appl. Phys. Lett. 87, 102509 (2005)
[2] D. Backes et al., Microelectron. Eng. 83, 1726 (2006)
[3] D. Backes et al., Appl. Phys. Lett. 91, 112502 (2007)