Numerical simulation of flux avalanches in type-II superconducting thin films under transient AC magnetic fields

Ze Jing; Mark D. Ainslie

doi:10.1088/1361-6668/ab9aa2

Numerical simulation of flux avalanches in type-II superconducting thin films under transient AC magnetic fields

Ze Jing, Mark D. Ainslie

Engineering

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

Flux avalanches induced from thermomagnetic instability are crucial challenges for the application of superconducting thin film devices. In this paper, flux avalanches in a type-II superconducting thin film exposed to a transient AC magnetic field are numerically simulated by solving the coupled nonlinear Maxwell's equations and the heat diffusion equation based on the fast Fourier transform (FFT) method. The dependence of the threshold magnetic field on the ambient temperature, film thickness and magnetic field ramp rate are obtained through these numerical simulations, which show good agreement with experimental results. A linear increase in the threshold field as the film thickness increases and a nonmonotonic increase in the threshold field as the ambient temperature increases have also been found. Our numerical results demonstrate that the threshold field decreases exponentially as the ramp rate increases. Flux avalanche patterns observed in magneto-optical imaging (MOI) measurements for a film exposed to an AC magnetic field are reproduced. The hysteresis magnetization and maximum temperature jump curves are also illustrated. We find that fingering instability plays an important role in the thermomagnetic response of superconducting thin films under transient AC magnetic fields, especially for high magnetic field ramp rates.

Original language	English
Article number	084006
Journal	Superconductor Science and Technology
Volume	33
Issue number	8
DOIs	https://doi.org/10.1088/1361-6668/ab9aa2
Publication status	Published - 3 Jul 2020

Keywords

flux avalanches
numerical simulation
superconducting thin film
thermomagnetic instability
transient AC magnetic field

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10.1088/1361-6668/ab9aa2

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title = "Numerical simulation of flux avalanches in type-II superconducting thin films under transient AC magnetic fields",

abstract = "Flux avalanches induced from thermomagnetic instability are crucial challenges for the application of superconducting thin film devices. In this paper, flux avalanches in a type-II superconducting thin film exposed to a transient AC magnetic field are numerically simulated by solving the coupled nonlinear Maxwell's equations and the heat diffusion equation based on the fast Fourier transform (FFT) method. The dependence of the threshold magnetic field on the ambient temperature, film thickness and magnetic field ramp rate are obtained through these numerical simulations, which show good agreement with experimental results. A linear increase in the threshold field as the film thickness increases and a nonmonotonic increase in the threshold field as the ambient temperature increases have also been found. Our numerical results demonstrate that the threshold field decreases exponentially as the ramp rate increases. Flux avalanche patterns observed in magneto-optical imaging (MOI) measurements for a film exposed to an AC magnetic field are reproduced. The hysteresis magnetization and maximum temperature jump curves are also illustrated. We find that fingering instability plays an important role in the thermomagnetic response of superconducting thin films under transient AC magnetic fields, especially for high magnetic field ramp rates.",

keywords = "flux avalanches, numerical simulation, superconducting thin film, thermomagnetic instability, transient AC magnetic field",

author = "Ze Jing and Ainslie, {Mark D.}",

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AU - Jing, Ze

AU - Ainslie, Mark D.

PY - 2020/7/3

Y1 - 2020/7/3

N2 - Flux avalanches induced from thermomagnetic instability are crucial challenges for the application of superconducting thin film devices. In this paper, flux avalanches in a type-II superconducting thin film exposed to a transient AC magnetic field are numerically simulated by solving the coupled nonlinear Maxwell's equations and the heat diffusion equation based on the fast Fourier transform (FFT) method. The dependence of the threshold magnetic field on the ambient temperature, film thickness and magnetic field ramp rate are obtained through these numerical simulations, which show good agreement with experimental results. A linear increase in the threshold field as the film thickness increases and a nonmonotonic increase in the threshold field as the ambient temperature increases have also been found. Our numerical results demonstrate that the threshold field decreases exponentially as the ramp rate increases. Flux avalanche patterns observed in magneto-optical imaging (MOI) measurements for a film exposed to an AC magnetic field are reproduced. The hysteresis magnetization and maximum temperature jump curves are also illustrated. We find that fingering instability plays an important role in the thermomagnetic response of superconducting thin films under transient AC magnetic fields, especially for high magnetic field ramp rates.

AB - Flux avalanches induced from thermomagnetic instability are crucial challenges for the application of superconducting thin film devices. In this paper, flux avalanches in a type-II superconducting thin film exposed to a transient AC magnetic field are numerically simulated by solving the coupled nonlinear Maxwell's equations and the heat diffusion equation based on the fast Fourier transform (FFT) method. The dependence of the threshold magnetic field on the ambient temperature, film thickness and magnetic field ramp rate are obtained through these numerical simulations, which show good agreement with experimental results. A linear increase in the threshold field as the film thickness increases and a nonmonotonic increase in the threshold field as the ambient temperature increases have also been found. Our numerical results demonstrate that the threshold field decreases exponentially as the ramp rate increases. Flux avalanche patterns observed in magneto-optical imaging (MOI) measurements for a film exposed to an AC magnetic field are reproduced. The hysteresis magnetization and maximum temperature jump curves are also illustrated. We find that fingering instability plays an important role in the thermomagnetic response of superconducting thin films under transient AC magnetic fields, especially for high magnetic field ramp rates.

KW - flux avalanches

KW - numerical simulation

KW - superconducting thin film

KW - thermomagnetic instability

KW - transient AC magnetic field

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U2 - 10.1088/1361-6668/ab9aa2

DO - 10.1088/1361-6668/ab9aa2

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SN - 0953-2048

VL - 33

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

IS - 8

M1 - 084006

ER -

Numerical simulation of flux avalanches in type-II superconducting thin films under transient AC magnetic fields

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