  The magnetization reversal in 330 nm triangular prismatic magnetic
nanoelements with variable magnetocrystalline anisotropy similar to that of
partially chemically ordered FePt is studied using micromagnetic simulations
employing Finite Element discretizations. Several magnetic properties including
the evaluation of the magnetic skyrmion number $S$ are computed in order to
characterize magnetic configurations exhibiting vortex-like formations.
Magnetic vortices and skyrmions are revealed in different systems generated by
the variation of the magnitude and relative orientation of the
magnetocrystalline anisotropy direction, with respect to the normal to the
triangular prism base. Micromagnetic configurations with skyrmion number
greater than one have been detected for the case where magnetocrystalline
anisotropy was normal to nanoelement's base. For particular magnetocrystalline
anisotropy values three distinct skyrmions are formed and persist for a range
of external fields. The simulation-based calculations of the skyrmion number S
revealed that skyrmions can be created for magnetic nanoparticle systems
lacking of chiral interactions such as Dzyaloshinsky-Moriya, but by only
varying the magnetocrystalline anisotropy.
