  Spin textures such as skyrmions and magnetic vortices are good candidates for
a variety of applications, such as magnetic memories, oscillators and
neuromorphic computing. Understanding the magnetic process of these systems is
important, as it determines the system's response in field and frequency. In
this work, we investigated the magnetization process of single microdisks by
measuring their magnetotransport properties as a function of temperature. The
strong dependence of resistance on the disks magnetic state helped us
understand the magnetization configurations of a single microdisk for different
temperatures and fields. We determined the thermal barriers for the nucleation
and annihilation processes by fitting the nucleation and annihilation fields to
an exponential model. Moreover, we observed and characterized the domain wall
depinning effect for temperatures below 100 K. This effect prevents the
formation of a magnetic vortex during the nucleation process.
