Aging of magnetic skyrmions in a confined geometry

Magnetic configurations in a hexagonal nanostructure have been simulated using the Monte Carlo method. It has been found that a multiple-skyrmion state is stabilized in the system by a relatively strong interfacial Dzyaloshinskii–Moriya interaction. An aging effect takes place in the thermal evolution of the multiple-skyrmion state. The size and the shape of the skyrmions tend to become uniform with increasing temperature.