Thermal equilibrium and stability of complementary topological solitons in two-dimensional magnets
In this thesis the thermal stability of magnetic solitons, beyond skyrmions, in ultrathin transition metal films and 2D van der Waals magnets is investigated by means of transition state theory. The basis for this investigation is an extended Heisenberg model, which is parameterised from density functional theory and consists of exchange interaction, Dzyaloshinskii-Moriya interaction and magnetocrystalline anisotropy energy as well as Zeeman energy in an external magnetic field. Based on this spin model annihilation and nucleation rates for magnetic solitons are computed, which are then used to compute the thermal stability of these topological spin configurations. The investigation of solitons with various topological charges thereby requires dedicated treatment of different numbers of internal symmetries, as discussed in this thesis. Beyond that, the basis for the embedment of higher-order exchange interactions into the framework of transition state theory is developed.
Preview
Rights
Use and reproduction:
Please note that individual components of the publication may be subject to other licensing or copyright conditions.