  Magnetic skyrmions formed at temperatures around room temperature in
square-based parallelepiped magnetic FePt nanoparticles with perpendicular
magnetocrystalline anisotropy (MCA) were studied during the magnetization
reversal using micromagnetic simulations. Finite Differences (FD) method were
used for the solution of the Landau-Lifshitz-Gilbert equation. Magnetic
configurations exhibiting N\'eel skyrmionic formations were detected. The
magnetic skyrmions can be created in different systems generated by the
variation of external field, side length and width of the squared-based
parallelepiped magnetic nanoparticles. Micromagnetic configurations revealed a
variety of states which include skyrmionic textures with one distinct skyrmion
formed and being stable for a range of external fields around room-temperature.
The size of the formed N\'eel skyrmion is calculated as a function of the
external field, temperature, MCA and nanoparticle's geometrical characteristic
lengths which can be adjusted to produce N\'eel type skyrmions on demand having
diameters down to 12 nm. The micromagnetic simulations revealed that stable
skyrmions at the temperature range 270 - 330 K can be created for FePt magnetic
nanoparticle systems lacking of chiral interactions such as
Dzyaloshinskii-Moriya.
