Sökning: "vortex pinning"
Hittade 5 avhandlingar innehållade orden vortex pinning.
1. Tailored Properties of Ferromagnetic Thin Films
Sammanfattning : Magnetic thin films and patterned nanostructures have been studied with respect to their magnetic properties using SQUID-magnetometry, magnetic force microscopy, electrical measurements, and micromagnetic calculations. Properties of vortex domain walls, trapped in Permalloy nanowires with artificial constrictions, were investigated experimentally and by numerical calculations. LÄS MER
2. Nonlinear dynamics of strongly-bound magnetic vortex pairs
Sammanfattning : This work is a study of nonlinear phenomena in vertically stacked pairs of magnetic vortices. New dynamic regimes are uncovered with a decrease in the inter-vortex separation to below the lateral vortex-core size. LÄS MER
3. Phase transitions in novel superfluids and systems with correlated disorder
Sammanfattning : Condensed matter systems undergoing phase transitions rarely allow exact solutions. The presence of disorder renders the situation even worse but collective Monte Carlo methods and parallel algorithms allow numerical descriptions. LÄS MER
4. Resonant vortex-pair dynamics and magnetocalorics in magnetic nanostructures
Sammanfattning : This thesis investigates the dynamics of spin vortex pairs in nanopillars andthermal effects in magnetic multilayers with RKKY-like indirect exchange.Spin vortices are being investigated as storage elements for memory applicationsas well as for GHz oscillators and signal processing devices. LÄS MER
5. From Order to Disorder in High Temperature Superconductors
Sammanfattning : Phase transitions in a number of models related to hightemperature superconductors are investigated, using scalingmethods and Monte Carlo simulations. This thesis considers twomain topics. LÄS MER