Observation of magnetic vortices in tridimensional nanomagnetic caps observed using transmission electron microscopy and magnetic force microscopy

MÁRCIO M. SOARES; EMILIO DE BIASI; LETÍCIA N. COHELO; MAURÍCIO C. DOS SANTOS; FORTUNATO S. DE MENESES; MARCELO KNOBEL; LUIS SAMPAIO; FLÁVIO GARCIA

PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS

The American Physical Society

Año: 2008 vol. 77 p. 1 - 7

0163-1829

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
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.
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
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.
50–100 nm, the caps are segmented into nanopillars
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.
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.