Phenomenological theories of magnetic multilayers and related systems [Elektronische Ressource] / by Mykola Kyselov

Department of PhysicsFaculty of Mathematics and Natural SciencesTechnical University DresdenPhenomenological theories of magnetic multilayers andrelated systemsDISSERTATIONfor the partial fulfillment of the requirements for the academic degree ofDoctor rerum naturalium(Dr.rer.nat.)byDipl.-Phys. Mykola Kyselovborn July 15, 1979 in Slowjansk, UkraineDresden2010Gutachter1:Gutachter2:AbstractIn this thesis multidomain states in magnetically ordered systems with competing long-rangeand short range interactions are under consideration . In particular, in antiferromagneticallycoupled multilayers with perpendicular anisotropy unusual multidomain textures can be sta-bilized due to a close competition between long-range demagnetization fields and short-rangeinterlayer exchange coupling. These spatially inhomogeneous magnetic textures of regularmultidomain configurations and irregular networks of topological defects as well as complexmagnetization reversal processes are described in the frame of the phenomenological theoryof magnetic domains. Using a modified model of stripe domains it is theoretically shownthat the competition between dipolar coupling and antiferromagnetic interlayer exchangecoupling causes an instability of ferromagnetically ordered multidomain states and results inthree possible ground states: ferromagnetic multidomain state, antiferromagnetic homoge-neous and antiferromagnetic multidomain states.