Nucleation of superconductivity in a superconducting disk with magnetic dot

We have studied the superconducting T c (H ) phase boundary of an Al superconducting disk with a perpendicularly magnetized dot on top of it. We used cylindrical and triangular dots. The inhomogeneous stray fields generated by these dots strongly affect the T c (H ) line, which now has the highest T c at a finite applied field. This 'magnetic bias' of the T c (H ) phase boundary depends on the magnetization of the dots. The field inhomogeneity leads to a pronounced modification of the T c (H ) periodicity. The theoretical T c (H ) dependence, calculated in the framework of the Ginzburg-Landau theory, fits our experimental data very well. In a superconducting Pb film with a lattice of Co/Pd magnetic dots, field-induced superconductivity has been investigated. This remarkable effect appears due to the compensation of the returning stray fields of the dots by the applied magnetic field. As a result of the field compensation, the total field under the dots is enhanced, whereas in the areas between the dots the total field is strongly reduced, thus causing the field-induced superconductivity to appear.

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Nucleation of superconductivity and vortex matter in hybrid superconductor/ferromagnet nanostructures

Moshchalkov

Golubović

Morelle

2006

Comptes Rendus. Physique

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Meissner state in highly forced superconducting systems

2019

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We show a possible relationship between the deformation factor [Formula: see text] and the inverse of the de Gennes parameter [Formula: see text] in the Ginzburg–Landau model for a superconducting meso-film and meso-disk in the presence of an external magnetic field in the Meissner state. It is shown that there is a lineal relationship between [Formula: see text] and [Formula: see text] when a forced model is considered. This being the case, the curves for the magnetization M (H) and the magnetic susceptibility [Formula: see text] are presented for several values of [Formula: see text] and [Formula: see text], showing an acceptable qualitative fit between these curves.

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Nucleation of superconductivity in a superconducting disk with magnetic dot

Cited by 2 publications

References 13 publications

Nucleation of superconductivity and vortex matter in hybrid superconductor/ferromagnet nanostructures

Nucleation of superconductivity and vortex matter in hybrid superconductor/ferromagnet nanostructures

Meissner state in highly forced superconducting systems

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