  We report the creation and real-space observation of magnetic structures with
well-defined topological properties and a lateral size as low as about 150 nm.
They are generated in a thin ferrimagnetic film by ultrashort single optical
laser pulses. Thanks to their topological properties, such structures can be
classified as Skyrmions of a particular type that does not require an
externally applied magnetic field for stabilization. Besides Skyrmions, we are
able to generate magnetic features with topological characteristics that can be
tuned by changing the laser fluence. The stability of such features is
accounted for by an analytical model based on the interplay between the
exchange and the magnetic dipole-dipole interactions
