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Modeling and study of quasi-two-dimensional magnetic materials
Priessnitz, Jan ; Baláž, Pavel (advisor) ; Legut, Dominik (referee)
Dzyaloshinskii-Moriya interaction (DMI) is a type of exchange interaction found in non-centrosymmetric structures. It favors spin canting, and it is an important mechanism for stabilizing non-collinear magnetic structures, such as skyrmions, which are promising candidates for applications in spintronics. Furthermore, DMI plays a significant role in multiferroics and can support magnetoelectricity. Both phenomena are often observed in layered materials. This thesis explores, through numerical simulations, the effect of out-of-plane DMI on magnetic ordering in two-dimensional triangular lattices. It uses the classical Heisenberg model together with Markov Chain Monte Carlo and spin dynamics simulation methods. Apart from DMI, the Hamiltonian includes ferromagnetic exchange interaction between nearest neighbours and interaction with external magnetic field. In the first part, the zero-temperature properties of the system are computed for various DMI strengths and external magnetic fields, and a phase diagram is constructed. Three magnetic phases are observed: ferromagnetic, antiferromagnetic cycloidal, and conical - a mixture of the former two. The second part focuses on finite-temperature properties, starting with specific heat capacity, magnetization, and magnetic susceptibility. DMI does not affect the...
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