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

Victor V. Moshchalkov; Dušan S. Golubović; Mathieu Morelle

doi:10.1016/j.crhy.2005.12.004

Nucleation of superconductivity and vortex matter in hybrid superconductor/ferromagnet nanostructures
[Nucléation de la supraconducivté et de la vorticité dans des nanostructure hybrides supraconducteur/ferromagnétique]

Victor V. Moshchalkov ¹ ; Dušan S. Golubović ¹ ; Mathieu Morelle ¹

¹ INPAC—Institute for Nanoscale Physics and Chemistry, Nanoscale Superconductivity and Magnetism Group, Laboratory for Solid State Physics and Magnetism, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium

Comptes Rendus. Physique, Superconductivity and magnetism, Volume 7 (2006) no. 1, pp. 86-98.

Résumé
Abstract

Nous avons étudié la frontière $T_{c} (H)$ de la phase supraconductrice d'un disque supraconducteur d'aluminium sur lequel est placé un plot magnétisé perpendiculairement. Nous avons utilisé des plots cylindrqiues et triangulaires. Les champs de fuite inhomogènes créés par ces plots affectent fortement la ligne $T_{c} (H)$ , qui atteint maintenant sa $T_{c}$ maximale pour un champ appliqué fini. Ce « déplacement magnétique » de la frontière $T_{c} (H)$ dépend de la magnétisation des plots. L'inhomogénéité du champ induit une modification profonde de la périodicité de $T_{c} (H)$ . La dépendance (théorique) de $T_{c} (H)$ , calculée dans le cadre de la théorie de Ginzburg–Landau, est en très bon accord avec nos données expérimentales. Nous avons étudié la supraconductivité induite par le champ dans une couche supraconductrice de Pb sur laquelle est placée un réseau de plots magnétiques de Co/Pd. Cet effet remarquable semble être dû à la compensation par le champ magnétique appliqué des champs de fuite réentrants des plots. Suite à cette compensation, le champ total sous les plots est augmenté, alors qu'il décroît fortement dans les zones situées entre les plots, ce qui provoque l'apparaition de la supraconductivité induite par le champ.

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.

Publié le : 2006-01-01

DOI : 10.1016/j.crhy.2005.12.004

Keywords: Superconductivity, Ferromagnetism, Hybrid nanostructures
Mots-clés : Supraconductivité, Ferromagnétisme, Nanostructures hybrides

Affiliations des auteurs :

Victor V. Moshchalkov ¹ ; Dušan S. Golubović ¹ ; Mathieu Morelle ¹

¹ INPAC—Institute for Nanoscale Physics and Chemistry, Nanoscale Superconductivity and Magnetism Group, Laboratory for Solid State Physics and Magnetism, KU Leuven, Celestijnenlaan 200D, B-3001 Leuven, Belgium

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     pages = {86--98},
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     year = {2006},
     doi = {10.1016/j.crhy.2005.12.004},
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Victor V. Moshchalkov; Dušan S. Golubović; Mathieu Morelle. Nucleation of superconductivity and vortex matter in hybrid superconductor/ferromagnet nanostructures. Comptes Rendus. Physique, Superconductivity and magnetism, Volume 7 (2006) no. 1, pp. 86-98. doi : 10.1016/j.crhy.2005.12.004. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2005.12.004/

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