Anomalous Hall effect studied via guided vortex motion

Wördenweber, R.; Sankarraj, J.S.K.; Dymashevski, P.; Hollmann, E.

doi:10.1016/j.physc.2005.11.014

Cited by 16 publications

(13 citation statements)

References 17 publications

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“…11 Later in the article, we will show that the direction of vortex motion most likely coincides with the geometrical arrangement of the magnetic dots, i.e., we will demonstrate the presence of guided motion in this part of the phase diagram and regime of current densities.…”

Section: Resultsmentioning

confidence: 77%

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

González

Hollmann

Wördenweber

2007

Journal of Applied Physics

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The guidance of vortices in superconducting Nb films with periodic arrangements of magnetic Ni dots is studied via simultaneous four-probe measurements in standard and Hall configuration. Ni dots are fabricated via e-beam lithography and lift-off technology. Arrays with periodicity down to 400 nm and dot size of 200 nm are obtained. Subsequently, the arrays are covered with a thin superconducting Nb layer. Simultaneous Hall and standard resistive measurements of the flux dynamic in Nb bridges with and without magnetic dots demonstrate and quantify the guidance of flux via the magnetic dots. Guidance of vortices is only possible in a limited current regime; guidance improves with decreasing temperature. Within the identified current regime most of the vortices ͑Ͼ40% for zero field͒ and in the optimum case all of the vortices are guided by the magnetic dots.

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Section: Resultsmentioning

confidence: 77%

“…[8][9][10] The AHE is caused by vortex motion with a directional component antiparallel to the current direction. 11 Close to T c and in the superconducting regime, vortices are mobile. They are driven by the Lorentz force ͑perpendicular to applied current and magnetic field͒ and the Magnus force ͑antiparallel to the current͒.…”

Section: Resultsmentioning

confidence: 99%

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

González

Hollmann

Wördenweber

2007

Journal of Applied Physics

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“…13 The experiment was demonstrated that active and passive superconducting thin-film devices can be used as very sensitive tools for detecting motion and penetration of vortices in superconducting material and that the analysis of the local distribution of vortices in the devices can be used for optimization of device properties. [14][15][16] The present work uses time-dependent GL theory to study the vortex matter profile, Gibbs free energy and magnetization for a circle with a hole at the center connected to the outside vacuum through a very thin slit with angular width. We have also studied the influence of a metallic or superconducting material in contact with the sample on the first vortex entry field of the superconducting sample.…”

Section: Introductionmentioning

confidence: 99%

Superconducting state in a circular SQUID shaped mesoscopic film

2014

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Using a thin-film approach to the time-dependent Ginzburg-Landau theory, we have studied the magnetization and order parameter profile in a thin mesoscopic superconductor in the so-called SQUID geometry. Our sample is circular with a hole at the center connected to the outer rim by a very thin slit. We have also studied the influence of the boundary conditions in the thin slit on the magnetization curve of the sample.

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“…As a consequence of the guided vortex motion, an even-in-field reversal transverse resistivity component appears, unlike the ordinary Hall resistivity which is odd regarding the field reversal. A guiding of vortices can be achieved with different sorts of PP landscapes [15,16] though it is more strongly enhanced and can be more easily treated theoretically when using PPs of the washboard type (WPP).…”

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confidence: 99%