Enhanced pinning and proliferation of matching effects in a superconducting film with a Penrose array of magnetic dots

Silhanek, Alejandro; Gillijns, Werner; Moshchalkov, Victor; Zhu, Bo; Moonens, Jozef; Leunissen, L.H.A.

doi:10.1063/1.2361172

Cited by 54 publications

(61 citation statements)

References 12 publications

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“…6 Unfortunately, at low temperatures, such PCs facilitate the proliferation of flux channeling [7][8][9][10] leading to unwanted instabilities of thermomagnetic origin 11,12 which render the superconductor impractical. A good compromise between strong pinning and lack of channeling can be achieved by introducing a quasiperiodic array of PCs, as suggested theoretically by Misko et al [13][14][15] and confirmed experimentally by Kemmler et al 16 and Silhanek et al 17 This aperiodic distribution of pinning centers may be further optimized by matching it to the typically non-uniform distribution of vortices. For instance, in order to create a distribution of PCs compatible with zero-field cooling conditions, one should then distribute them with a density gradient, decreasing from the edges toward the center of the sample, as expected for the vortex distribution of a partially penetrated sample in the mixed state according to the Bean model.…”

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confidence: 92%

Enhanced pinning in superconducting thin films with graded pinning landscapes

Motta

Colauto

Ortiz

et al. 2013

Applied Physics Letters

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A graded distribution of pinning centers (antidots) in superconducting MoGe thin films has been investigated by magnetization and magneto-optical imaging. The pinning landscape has maximum density at the border, decreasing progressively towards the center. At high temperatures and low fields, where this landscape mimics the vortex distribution predicted by the Bean model, an increase of the critical current is observed. At low temperatures and fields, the superconducting performance of the non-uniform sample is also improved due to suppression of thermomagnetic avalanches. These findings emphasize the relevance of non-uniform pinning landscapes, so far experimentally unexplored, on the enhancement of pinning efficiency.

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confidence: 92%

Enhanced pinning in superconducting thin films with graded pinning landscapes

Motta

Colauto

Ortiz

et al. 2013

Applied Physics Letters

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“…Using APS incommensurate with vortex lattices results in an elastic deformation of the vortex lattice and thus in an increase in the elastic energy. However, pinning properties of a superconductor can be even improved by using incommensurate APS sites, as recently demonstrated (theoretically 17,18 and experimentally [19][20][21][22] ) for quasiperiodic (QP) tiling APS. The important property of QP APS [17][18][19][20][21][22] is the existence of many built-in periods resulting in flux pinning for various flux densities.…”

Section: Introductionmentioning

confidence: 99%

Magnetic flux pinning in superconductors with hyperbolic-tessellation arrays of pinning sites

Nori

2012

Phys. Rev. B

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We study magnetic flux interacting with arrays of pinning sites (APS) placed on vertices of hyperbolic tesselations (HT). We show that, due to the gradient in the density of pinning sites, HT APS are capable of trapping vortices for a broad range of applied magnetic fluxes. Thus, the penetration of magnetic field in HT APS is essentially different from the usual scenario predicted by the Bean model. We demonstrate that, due to the enhanced asymmetry of the surface barrier for vortex entry/exit, this HT APS could be used as a "capacitor" to store magnetic flux.

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“…These include square [1][2][3][4][5][6], triangular [7][8][9], rectangular [10][11][12], honeycomb [13,14], spin ice [15,16], quasiperiodic [17][18][19][20] and other geometries [21,22]. In these systems a rich variety of novel vortex crystalline states can form, and there can be transitions between commensurate and incommensurate states as a function of vortex density.…”

Section: Introductionmentioning

confidence: 99%

Pinning, flux diodes and ratchets for vortices interacting with conformal pinning arrays

Wang

Xiao

Kwok

et al. 2017

Physica C: Superconductivity and its Applications

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A conformal pinning array can be created by conformally transforming a uniform triangular pinning lattice to produces a new structure in which the six-fold ordering of the original lattice is conserved but where there is a spatial gradient in the density of pinning sites. Here we examine several aspects of vortices interacting with conformal pinning arrays and how they can be used to create a flux flow diode effect for driving vortices in different directions across the arrays. Under the application of an ac drive, a pronounced vortex ratchet effect occurs where the vortices flow in the easy direction of the array asymmetry. When the ac drive is applied perpendicular to the asymmetry direction of the array, it is possible to realize a transverse vortex ratchet effect where there is a generation of a dc flow of vortices perpendicular to the ac drive due to the creation of a noise correlation ratchet by the plastic motion of the vortices. We also examine vortex transport simulations in experiments and compare the pinning effectiveness of conformal arrays to uniform triangular pinning arrays. We find that a triangular array generally pins the vortices more effectively at the first matching field and below, while the conformal array is more effective at higher fields where interstitial vortex flow occurs.

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Enhanced pinning and proliferation of matching effects in a superconducting film with a Penrose array of magnetic dots

Cited by 54 publications

References 12 publications

Enhanced pinning in superconducting thin films with graded pinning landscapes

Enhanced pinning in superconducting thin films with graded pinning landscapes

Magnetic flux pinning in superconductors with hyperbolic-tessellation arrays of pinning sites

Pinning, flux diodes and ratchets for vortices interacting with conformal pinning arrays

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