Imaging the Statics and Dynamics of Superconducting Vortices and Antivortices Induced by Magnetic Microdisks - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review X Année : 2011

Imaging the Statics and Dynamics of Superconducting Vortices and Antivortices Induced by Magnetic Microdisks

Résumé

If a magnet of microscopic dimensions is brought in close proximity to a superconductor, the quantized nature of their interaction due to the creation of flux quanta in the superconducting system becomes noticeable. Herein, we directly image, via scanning Hall microscopy, the vortex-antivortex pairs in a superconducting film created by micromagnets. The number of antivortices at equilibrium conditions can be changed either by tuning the magnetic moment of the magnets or by annihilation with externally induced vortices. We demonstrate that small ac field excitations shake the antivortices sitting next to the micromagnets whereas no sizable motion is observed for the vortices sitting on top of the magnets, clearly revealing the different mobility of these two vortex species. A metastable state, which is obtained by applying a field after the system has been cooled down below the superconducting transition, shows a complex graded distribution of coexisting vortices and antivortices forming an intertwined critical state.

Dates et versions

hal-00713293 , version 1 (29-06-2012)

Identifiants

Citer

Roman B.G. Kramer, A.V. Silhanek, W. Gillijns, V.V. Moshchalkov. Imaging the Statics and Dynamics of Superconducting Vortices and Antivortices Induced by Magnetic Microdisks. Physical Review X, 2011, 1, pp.021004. ⟨10.1103/PhysRevX.1.021004⟩. ⟨hal-00713293⟩

Collections

UGA CNRS NEEL
54 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More