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Imaging pinning and expulsion of individual superconducting vortices in amorphous MoSi thin films

Ceccarelli, L. and Vasyukov, D. and Wyss, M. and Romagnoli, G. and Rossi, N. and Moser, L. and Poggio, M.. (2019) Imaging pinning and expulsion of individual superconducting vortices in amorphous MoSi thin films. Physical Review B, 100 (10). p. 104504.

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Abstract

We use a scanning nanometer-scale superconducting quantum interference device (SQUID) to image individual vortices in amorphous superconducting MoSi thin films. Spatially resolved measurements of the magnetic field generated by both vortices and Meissner screening satisfy the Pearl model for vortices in thin films and yield values for the Pearl length and bulk penetration depth at 4.2 K. Flux pinning is observed and quantified through measurements of vortex motion driven by both applied currents and thermal activation. The effects of pinning are also observed in metastable vortex configurations, which form as the applied magnetic field is reduced and magnetic flux is expelled from the film. Understanding and controlling vortex dynamics in amorphous thin films is crucial for optimizing devices such as superconducting nanowire single photon detectors (SNSPDs), the most efficient of which are made from MoSi, WSi, and MoGe.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Nanotechnologie Argovia (Poggio)
UniBasel Contributors:Ceccarelli, Lorenzo and Vasyukov, Denis and Wyss, Marcus and Romagnoli, Giulio and Rossi, Nicola and Moser, Lucas and Poggio, Martino
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:American Physical Society
ISSN:2469-9950
e-ISSN:2469-9969
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:19 Mar 2020 12:29
Deposited On:19 Mar 2020 12:29

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