Abstract
Scanning ion microscopy with polarization analysis (SIMPA) is used to investigate the surface magnetic structure of patterned Co elements created in situ by focused ion-beam lithography from thin (30nm) Co films deposited on Si(100) substrates by electron-beam evaporation. The diameter d of the circular-shaped Co elements is varied between 5 and 38μm. Three-dimensional, spin- and spatially resolved SIMPA spin maps directly reveal the nonuniform micromagnetic structure of magnetic vortex and antivortex states. They are dominated by a circular or hyperbolic surface magnetization profile with a wide vortex or antivortex core in the center with a perpendicular surface magnetization component which decreases with increasing distance from the core. Varying d, the vortex wall thickness can be changed from 0.6 to 4.2μm. For Co elements with d<13μm, only single magnetic vortex states are found, whereas for d>13–15μm, magnetic multivortex and antivortex states are observed.
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