Thin films and nanostructures

Prof. Dr. Michael Huth

Goethe University, Frankfurt am Main

Thin film growth

Nano-patterned Nb thin film
AFM image of a washboard nanostructure milled by focused ion beam in a Nb film.

In the domain of fluxonics we investigate the properties and dynamics of Abrikosov vortices in nanostructured superconductors, with a focus on their conīŦnement, manipulation, and exploitation for emerging functionalities.

We aim at experimentally probing and enhancing the speed limits for the dynamics of Abrikosov vortices in superconducting films at high dc current densities and/or high ac frequencies.

We particularly focus on enhancing the upper current and frequency limits for vortex guiding (tendency of vortices to move along extended pinning structures), the ratchet (rectifying) effect and its reversals, i.e. the effects that are crucial for fluxonic devices operating at high vortex velocities. By analyzing similarities and differences between the pulsed-dc-driven and high-frequency-ac-stimulated vortex dynamics, we get insights into flux transport mechanisms at work in thin-film superconductors.