Limiting thermomagnetic avalanches in superconducting films by stop-holes

Colauto, F.; Vestgården, Jørn Inge; Andrade, Ankilma do Nascimento; Oliveira, Alisson Macário de; Ortiz, W.A.; Johansen, T. H.

doi:10.1063/1.4813908

Cited by 15 publications

(10 citation statements)

References 24 publications

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“…Theoretically, I layers provide the strongest pinning of propagating vortices and stop them more efficiently than holes in thin films which have been used to terminate dendritic flux avalanches. 35 The optimum number of S layers for particular materials is determined by a balance between reduced vortex dissipation and suppression of superconductivity at the S-I interfaces. Here H s of ideal S layers with d s > (ξλ) 1/2 remains the same as in the bulk, 12 contrary to the assertion 15 that H s is reduced at small d s .…”

Section: Discussionmentioning

confidence: 99%

Maximum screening fields of superconducting multilayer structures

Gurevich

2015

AIP Advances

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It is shown that a multilayer comprised of alternating thin superconducting and insulating layers on a thick substrate can fully screen the applied magnetic field exceeding the superheating fields Hs of both the superconducting layers and the substrate, the maximum Meissner field is achieved at an optimum multilayer thickness. For instance, a dirty layer of thickness ∼ 0.1 µm at the Nb surface could increase Hs ≃ 240 mT of a clean Nb up to Hs ≃ 290 mT. Optimized multilayers of Nb3Sn, NbN, some of the iron pnictides, or alloyed Nb deposited onto the surface of the Nb resonator cavities could potentially double the rf breakdown field, pushing the peak accelerating electric fields above 100 MV/m while protecting the cavity from dendritic thermomagnetic avalanches caused by local penetration of vortices.

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Section: Discussionmentioning

confidence: 99%

Maximum screening fields of superconducting multilayer structures

Gurevich

2015

AIP Advances

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“…Vortices breaking away from one triangle corner to a neighboring triangle may be promoted by excessive flux accumulation in the corners of triangles. 40 This is in stark contrast to the other samples, exhibiting no apparent easy vortex channels.…”

Section: Resultsmentioning

confidence: 66%

Enhancing the critical current of YBa2Cu3O7 thin films by substrate nanoengineering

Jones

Lam

et al. 2018

Journal of Applied Physics

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The critical current density, J c, can be increased by introducing defects throughout YBa 2Cu 3O 7 superconducting thin films. We propose a new approach of substrate nanoengineering to produce wellcontrolled defects. LaAlO 3 substrates have been ion-etched with different 34 nm deep patterns prior to the deposition of the films. An annealing step at 1000 °C after substrate etching has been undertaken to negate the Ar-ion damage to the surface. The J c of the so-prepared samples measured at different temperatures has been compared to thin films deposited on plain substrates at the same time. In general, an increase in J c is observed across all temperatures and fields as a result of both patterning and annealing. In particular, at zero field and 85 K, the largest enhancement of > 40% has been recorded for circle and triangle patterns. This new substrate nanoengineering technique is very promising for flux trapping of superconducting devices, particularly because an increase to critical current (I c) also occurs. Further optimization of depth, size, and shape of the patterns is expected to produce further improvements to J c.

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“…Thermo-magnetic avalanches or TMAs appear at T T c /2 as commonly observed in Nb samples [30,[37][38][39][40][41]. These avalanches are highly reproducible in successive runs under the same conditions.…”

Section: Tma Patterns In Nb Films With Py Stripesmentioning

confidence: 88%

Guiding thermomagnetic avalanches with soft magnetic stripes

et al. 2017

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We demonstrate the potential for manipulating the ultrafast dynamics of thermomagnetic flux avalanches (TMA) in superconducting films with soft magnetic stripes deposited on the film. By tuning the in-plane magnetization of the stripes, we induce lines of strong magnetic potentials for Abrikosov vortices, resulting in guided slow motion of vortices along the stripe edges and preferential bursts of TMA along the stripes. Furthermore, we show that transversely polarized stripes can reduce the TMA size by diverting magnetic flux away from the major trunk of the TMA into inter-stripe gaps. Our data indicate that TMAs are launched from locations with enhanced vortex entry barrier, where flux accumulation followed by accelerated vortex discharge significantly reduces the threshold of the applied field ramping speed required for the creation of TMAs. Finally, vortex-antivortex annihilation at the moving front of an expanding TMA can account for the enhanced TMA activity in the receding branches of the sample's magnetization cycle and the preferred propagation of TMAs into maximum trapped flux regions.

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Limiting thermomagnetic avalanches in superconducting films by stop-holes

Cited by 15 publications

References 24 publications

Maximum screening fields of superconducting multilayer structures

Maximum screening fields of superconducting multilayer structures

Enhancing the critical current of YBa2Cu3O7 thin films by substrate nanoengineering

Guiding thermomagnetic avalanches with soft magnetic stripes

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