Article abstract
Nature Physics 1, 172 - 176 (2005)
doi:10.1038/nphys173
Subject Categories: Condensed-matter physics | Nanotechnology
Soliton-pair dynamics in patterned ferromagnetic ellipses
Kristen S. Buchanan1, Pierre E. Roy1,2, Marcos Grimsditch1, Frank Y. Fradin1, Konstantin Yu. Guslienko1, Sam D. Bader1 and Valentyn Novosad1
Abstract
Confinement alters the energy landscape of nanoscale magnets, leading to the appearance of unusual magnetic states, such as vortices, for example. Many basic questions concerning dynamical and interaction effects remain unanswered, and nanomagnets are convenient model systems for studying these fundamental physical phenomena. A single vortex in restricted geometry, also known as a non-localized soliton, possesses a characteristic translational excitation mode that corresponds to spiral-like motion of the vortex core around its equilibrium position. Here, we investigate, by a microwave reflection technique, the dynamics of magnetic soliton pairs confined in lithographically defined, ferromagnetic Permalloy ellipses. Through a comparison with micromagnetic simulations, the observed strong resonances in the subgigahertz frequency range can be assigned to the translational modes of vortex pairs with parallel or antiparallel core polarizations. Vortex polarizations play a negligible role in the static interaction between two vortices, but their effect dominates the dynamics.
- Materials Science Division and Center for Nanoscale Materials, Argonne National Laboratory, Argonne, Illinois 60439, USA
- Department of Engineering Science, Uppsala University, Box 534, SE-751 21 Uppsala, Sweden
Correspondence to: Valentyn Novosad1 e-mail: novosad@anl.gov
MORE ARTICLES LIKE THIS
These links to content published by NPG are automatically generated.
NEWS AND VIEWS
Spintronics Field-free ringing of nanomagnetsNature Physics News and Views (01 Jul 2007)
Magnetism Vortex ups and downsNature Nanotechnology News and Views (01 Apr 2007)
See all 4 matches for News And ViewsRESEARCH
Magnetic vortex core reversal by excitation with short bursts of an alternating fieldNature Letters to Editor (23 Nov 2006)
Electrical switching of the vortex core in a magnetic diskNature Materials Letter (01 Apr 2007)
See all 16 matches for Research