Vortex dynamics induced by scanning SQUID susceptometry

Bishop-Van Horn, Logan; Mueller, Eli; Moler, Kathryn A.

doi:10.1103/physrevb.107.224509

Vortex dynamics induced by scanning SQUID susceptometry

Journal Article · Thu Jun 15 00:00:00 EDT 2023 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.107.224509· OSTI ID:1985286

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SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States); Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States)

In this work, we measured the local magnetic response of a niobium thin film by applying a millitesla-scale AC magnetic field using a micron-scale field coil and detecting the response with a micron-scale pickup loop in a scanning superconducting quantum interference device (SQUID) susceptometry measurement. Near the film's critical temperature, we observed a steplike nonlinear and dissipative magnetic response due to the dynamics of a small number of vortex-antivortex pairs induced in the film by the local applied AC field. We modeled the dynamics of the measurement using a combined two-dimensional London-Maxwell and time-dependent Ginzburg-Landau approach, allowing us to construct a detailed real-space picture of the vortex motion causing the observed dissipative response. This work pushes scanning SQUID susceptometry of two-dimensional superconductors beyond the regime of linear response and lays the foundation for microscopic studies of vortex dynamics and pinning in superconducting devices and more exotic materials systems.

View Accepted Manuscript (DOE)

Research Organization:: Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1985286

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 22 Vol. 107; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Vortex dynamics induced by scanning SQUID susceptometry Bishop-Van Horn, Logan; Mueller, Eli; Moler, Kathryn Zenodo https://doi.org/10.5281/zenodo.7857363	dataset	January 2023

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75 CONDENSED MATTER PHYSICS
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Vortex dynamics induced by scanning SQUID susceptometry

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