Quantitative analysis of the guidance of vortices in superconducting films with magnetic dots

González, M.P.; Hollmann, E.; Wördenweber, R.

doi:10.1063/1.2781515

Cited by 8 publications

(7 citation statements)

References 11 publications

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“…Various techniques have been used to provide different pinning sites in the form of dots [26,27], (blind) antidots [22][23][24][25], stripes [28] and more complex nonmagnetic [16][17][18][19] and magnetic [29][30][31] (nano)structures. All these approaches share the problem that a full and exact theoretical description of the two-dimensional nonlinear vortex dynamics in these systems has not been available so far.…”

Section: Introductionmentioning

confidence: 99%

Electrical transport and pinning properties of Nb thin films patterned with focused ion beam-milled washboard nanostructures

et al. 2012

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Abstract. A careful analysis of the magneto-transport properties of epitaxial nanostructured Nb thin films in the normal and the mixed state is performed. The nanopatterns were prepared by focused ion beam (FIB) milling. They provide a washboard-like pinning potential landscape for vortices in the mixed state and simultaneously cause a resistivity anisotropy in the normal state. Two matching magnetic fields for the vortex lattice with the underlying nanostructures have been observed. By applying these fields, the most likely pinning sites along which the flux lines move through the samples have been selected. By this, either the background isotropic pinning of the pristine film or the enhanced isotropic pinning originating from the nanoprocessing have been probed. Via an Arrhenius analysis of the resistivity data the pinning activation energies for three vortex lattice parameters have been quantified. The changes in the electrical transport and the pinning properties have been correlated with the results of the microstructural and topographical characterization of the FIB-patterned samples. Accordingly, along with the surface processing, FIB milling has been found to alter the material composition and the degree of disorder in as-grown films. The obtained results provide further insight into the pinning mechanisms at work in FIB-nanopatterned superconductors, e.g. for fluxonic applications.

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Section: Introductionmentioning

confidence: 99%

Electrical transport and pinning properties of Nb thin films patterned with focused ion beam-milled washboard nanostructures

et al. 2012

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“…For instance, non-simply-connected micro-or nanostructures will cause long-range electronic or magnetic interactions between vortices and artificial structures. Various arrangements of possible micro-and nano-objects ranging from magnetic to nonmagnetic dots, [1][2][3][4] completely etched holes (antidots), [5][6][7][8][9][10][11] to partially etched holes (blind holes) 12 are feasible and can lead to vortex pinning, trapping, annihilation, or guidance.…”

Section: Introductionmentioning

confidence: 99%

Regimes of flux transport at microwave frequencies in nanostructured high-Tcfilms

et al. 2012

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We report on combined dc and microwave electronic measurements of magnetic flux transport in micron and submicron-patterned high-T c films. In a given temperature regime below the superconducting transition temperature T c , the current-driven flux transport is restricted to flux motion guided by the submicron patterns. Via frequency-dependent measurements of the forward transmission coefficient S 21 it is demonstrated that the mechanism of the guided flux transport depends on the microwave frequency and the geometrical size of the superconducting structures. At low frequencies, flux is transported via Abrikosov vortices leading to additional microwave losses. Above a geometrically defined frequency, a different mechanism seems to be responsible for flux transport that does not contribute to the microwave losses and most likely represents a phase-slip type mechanism. The limiting vortex velocity obtained from the frequency dependence of the microwave properties agrees with the Larking-Ovchinnikov critical vortex velocity that is determined via dc pulse measurements. In spite of the change of mechanism, guidance of flux persists in these nanopatterns up to high frequencies of several GHz.

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“…SEM images of artificial defects ranging from BaZrO3 nanoparticles, antidots, or heavy-ion patterned channels in YBa2Cu3O7- thin films [4][5][6][7][8] to patterned channels in NbN/NbGe bilayer [2,3,9].…”

Section: Figmentioning

confidence: 99%

Engineering of superconductors and superconducting devices using artificial pinning sites

Wördenweber

2017

Physical Sciences Reviews

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Abstract Vortex matter in superconducting films and devices is not only an interesting topic for basic research but plays a substantial role in the applications of superconductivity in general. We demonstrate, that in most electronic applications, magnetic flux penetrates the superconductor and affects the performance of superconducting devices. Therefore, vortex manipulation turns out to be a useful tool to avoid degradation of superconducting device properties. Moreover, it can also be used to analyze and understand novel and interesting physical properties and develop new concepts for superconductor applications. In this review, various concepts for vortex manipulation are sketched. For example, the use of micro- and nanopatterns (especially, antidots) for guiding and trapping of vortices in superconducting films and thin film devices is discussed and experimental evidence of their vortex guidance and vortex trapping by various arrangements of antidots is given. We demonstrate, that the vortex state of matter is very important in applications of superconductivity. A better understanding does not only lead to an improvement of the performance of superconductor components, such as reduced noise, better power handling capability, or improved reliability, it also promises deeper insight into the basic physics of vortices and vortex matter.

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Quantitative analysis of the guidance of vortices in superconducting films with magnetic dots

Cited by 8 publications

References 11 publications

Electrical transport and pinning properties of Nb thin films patterned with focused ion beam-milled washboard nanostructures

Electrical transport and pinning properties of Nb thin films patterned with focused ion beam-milled washboard nanostructures

Regimes of flux transport at microwave frequencies in nanostructured high-Tcfilms

Engineering of superconductors and superconducting devices using artificial pinning sites

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