Reference : Imaging the Statics and Dynamics of Superconducting Vortices and Antivortices Induced by...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/105386
Imaging the Statics and Dynamics of Superconducting Vortices and Antivortices Induced by Magnetic Microdisks
English
Kramer, R. B. G. [> > > >]
Silhanek, Alejandro mailto [Université de Liège - ULg > Département de physique > Physique de la matière condensée]
Gillijns, W. [> > > >]
Moshchalkov, V. V. [> > > >]
2011
Physical Review X
American Physical Society
1
2
021004
Yes (verified by ORBi)
International
2160-3308
USA
[en] superconductivity ; SF hybrids ; vortex-antivortex pairs
[en] 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.
FundMat
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/105386
10.1103/PhysRevX.1.021004

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