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Publication Citation: Observation of a geometrically constrained domain wall in epitaxial FCC Co small disks

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Author(s): C Vaz; L Lopez-Diaz; M Klaui; J Bland; T Monchesky; John Unguris; Z Cui;
Title: Observation of a geometrically constrained domain wall in epitaxial FCC Co small disks
Published: May 01, 2004
Abstract: The magnetic nanostructure of epitaxial FCC Co/Cu(0 0 1) circular elements (~1.7 m in diameter) has been imaged with scanning electron microscopy with polarization analysis. A closed flux configuration (quadrant configuration) is observed for most of the disks, characteristic of systems with cubic anisotropy. However, the measured width of the 90° domain wall varies with the distance from the vortex core, from 70{plus or minus}25 nm up to a value determined by the disk radius. Such a wide domain wall is a consequence of the geometrical constraints imposed by the element, thus defining a geometrically constrained domain wall, as confirmed by micromagnetic simulations.
Citation: Journal of Magnetism and Magnetic Materials
Volume: 272-276
Issue: 3
Pages: pp. 1674 - 1675
Keywords: Co disk;domain wall width;magnetic imaging;SEMPA
Research Areas: Nanomagnetics