Researchers have observed stable magnetic skyrmions at room temperature in ultrathin Pt/Co/MgO nanostructures without an external magnetic field. These skyrmions, which are chiral spin structures, were imaged using high-resolution X-ray magnetic circular dichroism (XMCD-PEEM) microscopy, revealing their chiral Néel internal structure. The stability of these skyrmions is attributed to a strong Dzyaloshinskii-Moriya interaction (DMI), confirmed by spin wave spectroscopy and micromagnetic simulations. The DMI arises from the lack of structural inversion symmetry and spin-orbit coupling at the Co/MgO interface. The skyrmions' size and stability are governed by a balance between the DMI and magnetostatic interactions in the patterned structure. The results demonstrate that the skyrmion's chiral and topological properties are crucial for their manipulation and potential applications in non-volatile magnetic memory and logic devices. The study highlights the importance of lateral confinement and magnetic parameters in tuning skyrmion size and stability. The findings open new possibilities for the development of devices based on magnetic skyrmion manipulation.Researchers have observed stable magnetic skyrmions at room temperature in ultrathin Pt/Co/MgO nanostructures without an external magnetic field. These skyrmions, which are chiral spin structures, were imaged using high-resolution X-ray magnetic circular dichroism (XMCD-PEEM) microscopy, revealing their chiral Néel internal structure. The stability of these skyrmions is attributed to a strong Dzyaloshinskii-Moriya interaction (DMI), confirmed by spin wave spectroscopy and micromagnetic simulations. The DMI arises from the lack of structural inversion symmetry and spin-orbit coupling at the Co/MgO interface. The skyrmions' size and stability are governed by a balance between the DMI and magnetostatic interactions in the patterned structure. The results demonstrate that the skyrmion's chiral and topological properties are crucial for their manipulation and potential applications in non-volatile magnetic memory and logic devices. The study highlights the importance of lateral confinement and magnetic parameters in tuning skyrmion size and stability. The findings open new possibilities for the development of devices based on magnetic skyrmion manipulation.