Energetic Analysis of Magnetic Transitions in Ultra-small Nanoscopic Magnetic Rings - Condensed Matter > Other Condensed MatterReportar como inadecuado




Energetic Analysis of Magnetic Transitions in Ultra-small Nanoscopic Magnetic Rings - Condensed Matter > Other Condensed Matter - Descarga este documento en PDF. Documentación en PDF para descargar gratis. Disponible también para leer online.

Abstract: In this article, we report on experimental and theoretical investigations ofmagnetic transitions in cobalt rings of size diameter, width and thicknesscomparable to the exchange length of cobalt. Magnetization measurements wereperformed for two sets of magnetic ring arrays: ultra-small magnetic ringsouter diameter 13 nm, inner diameter 5nm and thickness 5 nm and smallthin-walled magnetic rings outer diameter 150 nm, width 5 nm and thickness 5nm. This is the first report on the fabrication and magnetic properties ofsuch small rings. Our calculations suggest that if the magnetic ring-s sizesare comparable to, or smaller than, the exchange length of the magneticmaterial, then only two magnetic states are important - the pure single domainstate and the flux closure vortex state. The onion-shape magnetic state doesnot arise. Theoretical calculations are based on an energetic analysis of pureand slightly distorted single domain and flux closure vortex magnetic states.Based on the analytical calculations, a phase diagram is also derived forultra-small ring structures exhibiting the region for vortex magnetic stateformations as a function of material parameter.



Autor: Deepak K. Singh, Robert V. Krotkov, Mark T. Tuominen

Fuente: https://arxiv.org/



DESCARGAR PDF




Documentos relacionados