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Type: Artigo de periódico
Title: Magnetic vortices in tridimensional nanomagnetic caps observed using transmission electron microscopy and magnetic force microscopy
Author: Soares, MM
de Biasi, E
Coelho, LN
dos Santos, MC
de Menezes, FS
Knobel, M
Sampaio, LC
Garcia, F
Abstract: Magnetic domain formation on three-dimensional nanostructures was investigated. Co/Pd multilayers were deposited on polystyrene nanospheres (50-1000 nm) to form a magnetic cap with variable thickness. High resolution transmission electron microscopy and magnetic force microscopy images, allied with micromagnetic simulations, were used to correlate the three-dimensional shape of the caps with their domain structures. For smaller spheres (50-100 nm), the caps are segmented into nanopillars (similar or equal to 10 nm) oriented toward the radial direction. For larger spheres (500-1000 nm), the cap is a continuous film with the magnetization forming a vortex at the top of the cap, with a core well larger than the ones observed in planar disks.
Country: EUA
Editor: Amer Physical Soc
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.77.224405
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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