Magnetic vortex behavior and its dynamics in nanomagnets in the presence of impurities

Autor:	R. A. Dias, D. Toscano, J.H. Silva, B. V. Costa, S. A. Leonel, P. Z. Coura
Rok vydání:	2012
Předmět:	Physics Magnetization dynamics Condensed matter physics Gaussian magnetization dynamics nanomagnets Interaction energy Physics and Astronomy(all) Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Nanomagnet Vortex symbols.namesake vortex Impurity Lattice (order) symbols Magnetic vortex
Zdroj:	Physics Procedia. 28:99-104
ISSN:	1875-3892
Popis:	Using spin dynamics simulations we study and present a model for pointlike magnetic impurities in nano-magnets based on the exchange coupling between these pointlike impurities and their neighbors. We observed two possible types of impurities, acting as pinning (attractive) or scatter (repulsive) sites. A gaussian profile was observed for the interaction potential energy ranging up to two lattice parameters. Using the known values of the parameters for Permalloy-79 we have calculated the interaction energy of the vortex core with a single defect. We estimated the interaction range as approximately 10 nm . Both results agree quite well with experimental measurements. Also, we study the influence of magnetic impurities in the frequency of the gyrotropic mode in nanodisks of Permalloy-79. We observed fluctuations in the frequency which is in agreement with recent experimental results.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c80cf117c289926ef6b76bd33fd09e47 https://doi.org/10.1016/j.phpro.2012.03.679 Zobrazit plný text záznamu