Single skyrmion induced by external magnetic field in CoFeB ferromagnetic alloy nanodisks

•Magnetization behavior in Co40Fe40B20 nanodisks is studied with.•Dzyaloshinskii-Moriya interaction induced by a Pt layer.•Skyrmions apparition and stability in amorphous CoFeB nanodisks are.•investigated.•The detected skyrmions are not spontaneously nucleated. Their nucleation is.•induced by an applied external field.•Reversal magnetization of CoFeB is also studied. In this paper, we study the magnetization behavior in Co40Fe40B20 nanodisks with Dzyaloshinskii-Moriya interaction, which is induced by a Pt layer. The known giant perpendicular magnetic anisotropy (PMA) in thin films elaborated from this kind of materials improves the topological structures nucleation. Our work consists in investigating the skyrmions apparition and stability in amorphous CoFeB nanodisks. The detected skyrmions are not spontaneously nucleated. Their nucleation is induced by an applied external field. We also study reversal magnetization of CoFeB and we elucidate skyrmions nucleation and annihilation.