Anomalous flux avalanche morphology in a a-MoGe superconducting film with a square antidot lattice - experiment and simulation

Motta, M.; Colauto, F.; Ortiz, W. A.; Vestgården, Jørn Inge; Johansen, T. H.; Cuppens, J.; Moshchalkov, Victor; Silhanek, Alejandro

doi:10.48550/arxiv.1109.2532

Cited by 3 publications

(3 citation statements)

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“…Although these results had shown clearly the effects of the underlying array of APCs on the dendrites, so far there were no clear indication of the main determining factors toward controlling the morphology of flux avalanches. In 2011, avalanches with a fascinating and unexpected morphology were reported by Motta et al [156]. Figure 13(a) shows a MO image of a 25 nm thick a-MoGe film decorated with a square array (lattice parameter of 1.5 µm) of square ADs (0.4 µm side) taken at 4.5 K and 1 Oe in which the dendrites have the habit of forming avalanches with main trunk along the principal axis of lattice and branches at angles of 45 • , resembling a Christmas tree.…”

Section: Avalanches In Superconducting Films With Arrays Ofmentioning

confidence: 91%

Controlling magnetic flux penetration in low-T_C superconducting films and hybrids

Colauto

Motta

Ortiz

2020

Supercond. Sci. Technol.

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In realistic situations, a typical scenario for applications of type II superconductors necessarily includes vortices, usually in the presence of currents. Under these circumstances, a Lorentz force acts on each individual vortex, propelling its dissipative movement across the superconducting medium, what increases the local temperature and, eventually, endangers the preservation of the superconducting state. Thus, preventing vortices from moving or, at least, designing strategies to minimize undesirable effects from their inevitable presence, is on the list of the most important demands. Vortex dynamics in superconducting films is a fundamental and complex subject in which efficiency is mainly represented by the ability of pinning vortices and thus increasing the current-carrying capability of the specimen. This Topical Review, focused on the strategies developed to control magnetic flux entry and restrict vortex mobility in low-T C superconducting films, compiles the most relevant literature on this subject, starting from a revision of the physical response of a plain film to externally applied magnetic fields and, subsequently, discussing specific changes caused to such a response when obstacles devoted to refrain vortices from moving around are cast into the scene, like arrays of antidots, conducting or magnetically active cap layers, and in-plane magnetic fields. An additional method of control discussed here is provided by the so-called Superconducting Flux Injector, through which one can decide where and when to feed the film with magnetic flux. It should also be mentioned that superconducting films are likely to exhibit avalanches at certain ranges of the applied magnetic field and the temperature, a feature that can be sharpened or mitigated by each of the above approaches, which is also discussed in this paper.

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Section: Avalanches In Superconducting Films With Arrays Ofmentioning

confidence: 91%

Controlling magnetic flux penetration in low-T_C superconducting films and hybrids

Colauto

Motta

Ortiz

2020

Supercond. Sci. Technol.

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“…Recently, a time-dependent Ginzburg-Landau (GL) simulation for square lattice systems has reproduced a similar phenomenon [10,11]. On the other hand, a dendritic diagonal flux avalanche has also been observed experimentally and theoretically in a square-lattice of square holes [12]. In this paper, we systematically investigate the flux penetration into square SNs and unveil a possible origin of the variety of the flux penetrations to propose a new method to control the easy direction of flux penetrations.…”

Section: Introductionmentioning

confidence: 79%

“…In a-T diagrams for SNs with d = 100 and 300 nm, the boundaries between PFP and DFP at low T also lie near w = 7λ eff (not shown). This d independence of the boundaries indicates that the demagnetizing effect is not the origin of DFP because it becomes weaker with increasing d. Next, diagonal flux avalanches were observed in similar square arrays of square holes in [12]. Flux avalanches occur more easily with larger width and at lower temperature in a single superconducting strip [27,28], corresponding to the condition of the low-T DFP region in the phase diagram (figure 2(g)).…”

Section: Dfp At Low Temperaturesmentioning

confidence: 92%

Anisotropic flux penetration into Nb square superconducting networks

Tsuchiya¹,

Nakajima²,

Tamegai³

et al. 2014

Supercond. Sci. Technol.

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Anisotropic flux penetration into square superconducting networks of Nb are studied by a magneto-optical imaging method. Their dependences on the lattice constant, the line width, the thickness of the networks, and temperature are systematically investigated. An anomalous diagonal flux penetration is observed (1) when the saturation number of vortices in a hole is equal to one possibly due to minimization of the Ginzburg-Landau free energy or (2) when the fan-shaped vortex penetration (vortex jet) from the corner of the square hole reaches the next-nearest-neighbor hole due to the enhanced current density with a high current-voltage exponent.

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Origin of Diagonal Flux Penetration into Square Superconducting Networks

et al. 2013

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Anomalous flux avalanche morphology in a a-MoGe superconducting film with a square antidot lattice - experiment and simulation

Cited by 3 publications

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Controlling magnetic flux penetration in low-T_C superconducting films and hybrids

Controlling magnetic flux penetration in low-T_C superconducting films and hybrids

Anisotropic flux penetration into Nb square superconducting networks

Origin of Diagonal Flux Penetration into Square Superconducting Networks

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Anomalous flux avalanche morphology in a a-MoGe superconducting film with a square antidot lattice - experiment and simulation

Cited by 3 publications

References 0 publications

Controlling magnetic flux penetration in low-T C superconducting films and hybrids

Controlling magnetic flux penetration in low-T C superconducting films and hybrids

Anisotropic flux penetration into Nb square superconducting networks

Origin of Diagonal Flux Penetration into Square Superconducting Networks

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Product

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Controlling magnetic flux penetration in low-T_C superconducting films and hybrids

Controlling magnetic flux penetration in low-T_C superconducting films and hybrids