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Vortex lattice instability at the nanoscale in a parallel magnetic field.

08:00 EDT 17th July 2019 | BioPortfolio

Summary of "Vortex lattice instability at the nanoscale in a parallel magnetic field."

In superconducting materials a dynamical rearrangement of the vortex lattice occurs by forcing vortices at high velocities, until the system can become unstable. This phenomenon is known as vortex lattice instability, in which a sudden transition drives the superconducting system abruptly to the normal state. We present an experimental study on submicron bridges of NbN and NbTiN ultra-thin films with a thickness of few nanometers. The nanoscale effect on vortex lattice instability is investigated not only by the ultra-thin thickness in wide bridges, but also by changing the direction of the external magnetic field applied parallel and perpendicular to the c-axis epitaxial films. Indeed, measurements are performed for both orientations and show the vortex lattice instability, regardless of the superconducting material. Critical currents Ic as well as instability currents I* have been compared. However, only in the parallel configuration an unusual "flying birds" feature appears in the magnetic field dependence of current switching, as a consequence of the ratio I*/Ic that is approaching to 1. This amazing tendency becomes relevant for practical applications involving nanostructures, since by scaling down sample thickness and rotating the external field towards the in-plane orientation, the ultra-thin film geometry can mimic the bridge narrowing down to nanoscale.

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This article was published in the following journal.

Name: Nanotechnology
ISSN: 1361-6528
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