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

Published

May 1, 2004

Author(s)

C Vaz, L Lopez-Diaz, M Klaui, J Bland, T Monchesky, John Unguris, Z Cui

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 70plus 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

Pub Type

Journals

Keywords

Co disk, domain wall width, magnetic imaging, SEMPA

Citation

Vaz, C. , Lopez-Diaz, L. , Klaui, M. , Bland, J. , Monchesky, T. , Unguris, J. and Cui, Z. (2004), Observation of a geometrically constrained domain wall in epitaxial FCC Co small disks, Journal of Magnetism and Magnetic Materials (Accessed October 18, 2025)