Magnetically controlled superconducting weak links

Magnetically controlled superconducting weak links

We have designed and characterized a magnetic template which can be switched between chains of parallel and antiparallel field distribution by applying an in-plane magnetic field. The parallel field profile creates highly mobile vortex channels in a superconducting film deposited on top, reproducing the behavior of a weak link as evidenced by the presence of Shapiro steps in the current-voltage...

Self-consistent theory of superconducting mesoscopic weak links.

A microscopic model for describing a superconducting mesoscopic weak link is presented. We consider a model geometry consisting of a narrow channel coupled to wider superconducting electrodes which act as reservoirs fixing the asymptotic values of the complex order parameter. For this model, the Bogoliubov-de Gennes equations are discretized and solved self-consistently using a non-equilibrium ...

Subharmonic energy-gap structure in superconducting weak links.

Charge and Spin Transport in Superconducting Weak Links

The coherent mixing of the current states in the superconducting weak link subject to a Josephson phase difference φ and subject to an external transport current in the banks is one of the aims of this work. At φ = π the nonlocal mixing of current states produces two vortices close to the point-contact between superconducting bulks. The effect of point-contact reflection in an impenetrable inte...

Magnetically controlled ferromagnetic swimmers

Microscopic swimming devices hold promise for radically new applications in lab-on-a-chip and microfluidic technology, diagnostics and drug delivery etc. In this paper, we demonstrate the experimental verification of a new class of autonomous ferromagnetic swimming devices, actuated and controlled solely by an oscillating magnetic field. These devices are based on a pair of interacting ferromag...