Control of dissipation in superconducting films by magnetic stray fields

TL;DR

This study demonstrates how magnetic stray fields in hybrid superconducting/magnetic nanostructures can be precisely controlled to significantly reduce or increase dissipation in superconducting films, with potential for improved device performance.

Contribution

It introduces a method to tune dissipation in superconductors via magnetic configurations of nanostructures, showing systematic control over stray fields and dissipation effects.

Findings

Dissipation can be decreased or increased by adjusting stray magnetic fields.

Ordering stray fields suppresses dissipation and enhances commensurability effects.

Magnetic configurations influence the superconducting dissipation behavior.

Abstract

Hybrid superconducting/magnetic nanostructures on Si substrates have been built with identical physical dimensions but different magnetic configurations. By constructing arrays based on Co-dots with in-plane, out-of-plane, and vortex state magnetic configurations, the stray fields are systematically tuned. Dissipation in the mixed state of superconductors can be decreased (increased) by several orders of magnitude by decreasing (increasing) the stray magnetic fields. Furthermore, ordering of the stray fields over the entire array helps to suppress dissipation and enhance commensurability effects increasing the number of dissipation minima.