Quasi‐Hexagonal Vortex‐Pinning Lattice Using Anodized Aluminum Oxide Nanotemplates

Hallet, Xavier; Michotte, Sébastien; Piraux, Luc; Vanacken, Johan; Moshchalkov, Victor; Mátéfi‐Tempfli, Stefan

doi:10.1002/smll.200900400

Cited by 12 publications

(19 citation statements)

References 23 publications

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“…The writing was carried out using a beam current of 10.5 pA, an acceleration voltage of 30 kV, a write-field of 100ϫ 100 m 2 and an area step size of 49.5 nm. 12,[16][17][18][19][20] Also, our process allows to obtain a lattice of defects with a square symmetry, while using the other two processes lattices with ͑often only local͒ hexagonal symmetry are achieved. With the above exposure parameters, the clearance dose of our PMMA was 300 C / cm 2 .…”

Section: Resultsmentioning

confidence: 99%

High field vortex matching effects in superconducting Nb thin films with a nanometer-sized square array of antidots

Sabatino

Cirillo

Carapella

et al. 2010

Journal of Applied Physics

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Articles you may be interested inPerpendicular applied magnetic field dependence of Josephson current and measurement of trapped magnetic flux in Nb superconducting thin film by vibrating sample magnetometer Nb thin films containing a regular square array of antidots with 17 nm diameter and 50 nm spacing have been fabricated using a relatively simple lithographic process. The critical current density j c ͑H͒ curves, obtained here by electric transport measurements, exhibit commensurability effects with pronounced maxima just above the expected 0 H 1 = 0.830 T and 0 H 1/2 = 0.415 T matching fields, down to temperatures as low as 2.3 K. The behavior of j c ͑H͒ as well as the position of the maxima are consistent with the ones calculated in the framework of the time dependent Ginzburg-Landau model.

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Section: Resultsmentioning

confidence: 99%

High field vortex matching effects in superconducting Nb thin films with a nanometer-sized square array of antidots

Sabatino

Cirillo

Carapella

et al. 2010

Journal of Applied Physics

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show abstract

“…There are few additional studies which measure the effects of only a particular type of order, with either shortrange order 27 of several lattice sites or long-range order. [28][29][30] Both report the presence of matching minima but do not provide a quantitative comparison with other disordered and ordered lattices. Thus, a comprehensive study where the type and amount of disorder is systematically controlled is needed.…”

Section: Introductionmentioning

confidence: 93%

Enhanced superconducting vortex pinning with disordered nanomagnetic arrays

Rosen¹,

Sharoni²,

Schuller³

2010

Phys. Rev. B

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We studied the effect of disorder on superconducting vortex pinning produced by arrays of artificial pinning sites. The magnetoresistance of samples with pinning configurations varying from a triangular array to an almost random distribution of pinning sites provides a controlled system for such studies. Interestingly even small degrees of order are sufficient to produce enhanced pinning at well-defined magnetic fields. These effects increase with increasing order and evolve toward the expected matching minima for a triangular array. Surprisingly, the position of the first matching minimum decreases with increasing disorder. Furthermore, additional matching minima appear at higher field values which do not coincide with commonly observed triangular pinning lattice matching minima.

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“…In analogy to other well-studied antidot systems [37,38], the elongated antidots act as pinning centers to trap vortices. Since, for a broad parameter range, the attractive vortex-pinning force is much stronger than the repulsive vortex-vortex interaction, the vortices prefer to occupy vacant antidots rather than forming an Abrikosov lattice.…”

Section: Sample and Experimentsmentioning

confidence: 99%

Mapping degenerate vortex states in a kagome lattice of elongated antidots via scanning Hall probe microscopy

Xue

et al. 2017

Phys. Rev. B

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We investigate the degeneracy of the superconducting vortex matter ground state by directly visualizing the vortex configurations in a kagome lattice of elongated antidots via scanning Hall probe microscopy. The observed vortex patterns, at specific applied magnetic fields, are in good agreement with the configurations obtained using time-dependent Ginzburg-Landau simulations. Both results indicate that the long-range interaction in this nanostructured superconductor is unable to lift the degeneracy between different vortex states and the pattern formation is mainly ruled by the nearest-neighbor interaction. This simplification makes it possible to identify a set of simple rules characterizing the vortex configurations. We demonstrate that these rules can explain both the observed vortex distributions and the magnetic-field-dependent degree of degeneracy.

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Quasi‐Hexagonal Vortex‐Pinning Lattice Using Anodized Aluminum Oxide Nanotemplates

Cited by 12 publications

References 23 publications

High field vortex matching effects in superconducting Nb thin films with a nanometer-sized square array of antidots

High field vortex matching effects in superconducting Nb thin films with a nanometer-sized square array of antidots

Enhanced superconducting vortex pinning with disordered nanomagnetic arrays

Mapping degenerate vortex states in a kagome lattice of elongated antidots via scanning Hall probe microscopy

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