Evolution of magnetism on a curved nano-surface

摘要: To design custom magnetic nanostructures, it is indispensable to acquire precise knowledge about the systems in nanoscale range where magnetism forms. In this paper we present effect of a curved surface on evolution ultrathin iron films. Nominally 70 A thick films were deposited 9 steps 3 different types templates: (a) monolayer silica spheres with 25 nm diameter, (b) 400 diameter and (c) for comparison flat silicon substrate. situ evaporation took place an ultrahigh vacuum chamber using molecular beam epitaxy technique. After steps, time differential nuclear forward scattering spectra, grazing incidence small angle X-ray images reflectivity curves recorded. order reconstruct visualize moment configuration cap formed top spheres, micromagnetic simulations performed all thicknesses. We found great influence template topography onset developed nanostructure. observed individual behaviour which was modelled by vortex formation collective structure domains spread over several particles. Depth selective measurements showed that begins at region contrast particles first appears are contact each other.