Dendritic Flux Avalanches and Nonlocal Electrodynamics in Thin Superconducting Films

Aranson, Igor S.; Gurevich, A.; Welling, M. S.; Wijngaarden, Rinke J.; Vlasko-Vlasov, Vitalii; Vinokur, V. M.; Welp, U.

doi:10.1103/physrevlett.94.037002

Cited by 129 publications

(135 citation statements)

References 35 publications

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“…Constant temperature zero fieldcooled (ZFC) dc magnetization curves, M(H), are plotted in figure 2(a). Low field magnetic instabilities arising from thermomagnetic effects [28] lead to flux avalanches which have also been reported in Pb [29] and in Nb films [30]. The matching features appear as "shoulders" in M(H) at regular magnetic field intervals which are enhanced as T is reduced.…”

Section: Resultsmentioning

confidence: 82%

Vortex pinning vs superconducting wire network: origin of periodic oscillations induced by applied magnetic fields in superconducting films with arrays of nanomagnets

Gómez¹,

Valle²,

González³

et al. 2014

Supercond. Sci. Technol.

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Abstract. Hybrid magnetic arrays embedded in superconducting films are ideal systems to study the competition between different physical (such as the coherence length) and structural length scales such as available in artificially produced structures. This interplay leads to oscillation in many magnetically dependent superconducting properties such as the critical currents, resistivity and magnetization. These effects are generally analyzed using two distinct models based on vortex pinning or wire network. In this work, we show that for magnetic dot arrays, as opposed to antidot (i.e holes) arrays, vortex pinning is the main mechanism for field induced oscillations in resistance R(H), critical current I c (H), magnetization M(H) and ac-susceptibility  ac (H) in a broad temperature range. Due to the coherence length divergence at T c , a crossover to wire network behaviour is experimentally found. While pinning occurs in a wide temperature range up to T c , wire network behaviour is only present in a very narrow temperature window close to T c . In this temperature interval, contributions from both mechanisms are operational but can be experimentally distinguished.

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Section: Resultsmentioning

confidence: 82%

Vortex pinning vs superconducting wire network: origin of periodic oscillations induced by applied magnetic fields in superconducting films with arrays of nanomagnets

Gómez¹,

Valle²,

González³

et al. 2014

Supercond. Sci. Technol.

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“…Although the physics behind the propagation of cracks, dielectric breakdowns, and flux avalanches, have been extensively studied in uniform media [2][3][4][5][6][7], little is known about the pattern formation in the case of periodic variations in the properties of the host material. In particular, one can then pose the question as to whether the morphology of flux avalanches is reflecting microscopic properties of the matrix or, inversely, if by introducing modulations on the material properties one would be able to impose a particular shape to the ubiquitous multi-branching splitting of avalanches.…”

Section: Introductionmentioning

confidence: 99%

Controllable morphology of flux avalanches in microstructured superconductors

et al. 2014

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The morphology of abrupt bursts of magnetic flux into superconducting films with engineered periodic pinning centers (antidots) has been investigated. Guided flux avalanches of thermomagnetic origin develop a tree-like structure, with the main trunk perpendicular to the borders of the sample, while secondary branches follow well-defined directions determined by the geometrical details of the underlying periodic pinning landscape. Strikingly, we demonstrate that in a superconductor with relatively weak random pinning, the morphology of such flux avalanches can be fully controlled by proper combinations of lattice symmetry and antidot geometry. Moreover, the resulting flux patterns can be reproduced, to the finest details, by simulations based on a phenomenological thermomagnetic model. In turn, this model can be used to predict such complex structures and to estimate physical variables of more difficult experimental access, such as the local values of temperature and electric field.

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“…However, the mechanism has recently also been shown to give localised, fingering instabilities. 14,15 Indeed, the instability threshold field predicted from this model was recently 16 shown to agree quantitatively with measurements in both Nb and MgB 2 films.…”

Section: Introductionmentioning

confidence: 58%

Avalanches injecting flux into the central hole of a superconductingMgB2ring

Olsen¹,

Johansen²,

Shantsev³

et al. 2007

Phys. Rev. B

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Magneto-optical imaging was used to observe dendritic flux avalanches connecting the outer and inner edges of a ring-shaped superconducting MgB2 film. Such avalanches create heated channels across the entire width of the ring, and inject large amounts of flux into the central hole. By measuring the injected flux and the corresponding reduction of current, which is typically 15 %, we estimate the maximum temperature in the channel to be 100 K, and the duration of the process to be on the order of a microsecond. Flux creep simulations reproduce all the observed features in the current density before and after injection events.

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Dendritic Flux Avalanches and Nonlocal Electrodynamics in Thin Superconducting Films

Cited by 129 publications

References 35 publications

Vortex pinning vs superconducting wire network: origin of periodic oscillations induced by applied magnetic fields in superconducting films with arrays of nanomagnets

Vortex pinning vs superconducting wire network: origin of periodic oscillations induced by applied magnetic fields in superconducting films with arrays of nanomagnets

Controllable morphology of flux avalanches in microstructured superconductors

Avalanches injecting flux into the central hole of a superconductingMgB2ring

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