Nanowall pinning for enhanced pinning force in YBCO films with nanofabricated structures

Palau, Anna; Rouco, V.; Luccas, R. F.; Obradors, X.; Puig, T.

doi:10.1016/j.physc.2014.06.011

Cited by 10 publications

(10 citation statements)

References 38 publications

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“…However, if the triangular holes (antidots) etched through the entire film thickness are present in the film (Fig. ), they create a barrier to vortex motion, where some may get pinned along the walls of the antidots due to the nano‐wall pinning . Once pinned, the walls perpendicular to the vortex motion, filled with vortices should then repel other vortices as they approach, further impeding their movement.…”

Section: Resultsmentioning

confidence: 99%

“…If this force exceeds the other forces, such as repulsive vortex‐vortex interactions and pinning, then the vortices start to move inducing energy losses and resistance. Mechanisms for arresting the motion of vortices by controlling collective vortex interactions with various pinning landscapes in the presence of driving currents and/or high magnetic fields and temperatures have been investigated in both low and high temperature superconductors .…”

Section: Introductionmentioning

confidence: 99%

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Tunable pinning effects produced by non‐uniform antidot arrays in YBCO thin films

et al. 2017

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Uniform, graded and spaced arrays of 3 μm triangular antidots in pulsed laser deposited YBa 2 Cu 3 O 7 (YBCO) superconducting thin films are compared by examining the improvements in the critical current density J c they produced. The comparison is made to establish the role of their lithographically defined (non-)uniformity and the effectiveness to control and/or enhance the critical current density. It is found that almost all types of non-uniform arrays, including graded ones enhance J c over the broad applied magnetic field and temperature range due to the modified critical state. Whereas uniform arrays of antidots either reduce or produce no effect on J c compared to the original (asdeposited) thin films.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tunable pinning effects produced by non‐uniform antidot arrays in YBCO thin films

et al. 2017

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“…Conversely, for systems with positive rectification, the field range where maximum effect is obtained appears in a region with weak vortex-vortex interactions and thus in this case it is reasonable to assume that collective interactions are not essencial to generate the ratchet potential. The asymmetry in this case would come from the nano-wall pinning created at the edges of the blind triangles [28].…”

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confidence: 99%

Geometrically controlled ratchet effect with collective vortex motion

et al. 2015

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Rectified flux motion arising from the collective effect of many interacting vortices is obtained in a specially designed superconducting device. Ratchet structures with different asymmetric pinning potentials are generated by tuning the size, depth, and distribution of triangular blind-antidots in a high-temperature superconducting film. We experimentally and theoretically demonstrate that the amplitude and sign of the rectified vortex motion can be finely tuned with the pattern geometry. Two different dynamical regimes depending on the nature of vortices initiating the dissipation are identified, which can control the rectified vortex motion.

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“…The ordering of vortices along the nanowalls, observed in the autocorrelation images evidences that, as observed from the transport measurements, the main parameter controlling vortex pinning in blind milled nanostructures are the nanowalls. This nanowall pining has been associated to a reduction of the order parameter near the nanowalls by localized deoxygenation or amorphization of the YBCO structure, induced by the nanofabrication technique, acting as a barrier for vortex motion [43] …”

Section: Nanowallsmentioning

confidence: 99%

6. Vortex dynamics in nanofabricated chemical solution deposition high-temperature superconducting films

Palau¹,

Rouco²,

Luccas³

et al. 2017

Superconductors at the Nanoscale

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Artificial manipulation and control of vortex dynamics in YBa 2 Cu 3 O 7 (YBCO) films have always been a complex issue, especially since high thermal excitations but also strong vortex pinning capabilities coexist in this material. Thus, artificial nanofabrication strategies able to generate competing effects with intrinsic microstructural defects need to be achieved. Lithography tools are widely used to create model systems with controlled pinning potentials in superconductors. However, these techniques easily disturb the optimal oxygen film doping in YBCO films and consequently the overall performances degrades. We have optimized the use of two different high-resolution nanolithography approaches, Focused Ion Beam Milling and Electron Beam Lithography, to artificially and locally modify the pinning landscape of YBCO films grown by chemical solution deposition (CSD). Three different nanofabricated systems will be discussed, which resulted in ideal structures to manipulate vortex dynamics in CSD-YBCO thin films with strong intrinsic pinning centers. In particular, we observed artificial granularity effects, nanowall pinning, and positive and negative rectification effects. We will report on our understanding of all these effects and potential expectations. IntroductionYBa 2 Cu 3 O 7−d (YBCO) is⁴ the technologically most relevant high-temperature superconductor, highly explored for practical applications [1][2][3][4][5][6]. The achievement of artificial pinning centers (APC) in YBCO films is of major concern when pinning forces need to be optimized, in coated conductors (long-length epitaxial YBCO films on buffered flexible metallic substrates), or when they need to be exploited for electronic applications, requiring flux quanta manipulation. However, flux pinning in cuprate superconductors requires control of the defect structure on a nanometric scale and this is a cumbersome problem. The primary concern is to develop efficient techniques for

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Nanowall pinning for enhanced pinning force in YBCO films with nanofabricated structures

Cited by 10 publications

References 38 publications

Tunable pinning effects produced by non‐uniform antidot arrays in YBCO thin films

Tunable pinning effects produced by non‐uniform antidot arrays in YBCO thin films

Geometrically controlled ratchet effect with collective vortex motion

6. Vortex dynamics in nanofabricated chemical solution deposition high-temperature superconducting films

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