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Book chapter
Superconducting Vortex-Antivortex Pairs: Nucleation and Confinement in Magnetically Coupled Superconductor-Ferromagnet Hybrids
pp.83-106
Intech Europe
01 Jan 2017
Abstract
Superconducting vortices are a well known class of vortices, each of them carrying a single magnetic flux quantum. In this chapter the authors present the results of low temperature Magnetic Force Microscopy experiments to investigate the nucleation and dynamics of superconducting vortices in magnetically coupled Superconductor/Ferromagnet (S/F) heterostructures made by Nb/Py. It is here shown that by controlling the thicknesses of both S and F layer, the formation of spontaneous vortex-antivortex pairs (V-AV) can be favored and their confinement and mobility can be tuned. The experimental results are compared with two theoretical models dealing with the spontaneous nucleation of V/AV pairs in the limits of S thickness respectively greater and smaller than the London penetration depth. It is shown that vortex nucleation and confinement is regulated by the intensity of the out-of-plane component of the magnetization with respect to a critical magnetization set by the thickness of both S and F layers. Additionally, external field cooling processes were used to probe in-field vortex nucleation and V-AV unbalancing, whereas the sweeping of an external magnetic field when below the superconducting critical temperature was used to force the vortex into motion, probing the vortex mobility/rigidity and the vortex avalanche events.
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Details
- Title
- Superconducting Vortex-Antivortex Pairs: Nucleation and Confinement in Magnetically Coupled Superconductor-Ferromagnet Hybrids
- Creators
- Cinzia Di Giorgio - Univ Salerno, Phys Dept ER Caianiello, Fisciano, SA, ItalyDomenico D'Agostino - Univ Salerno, Phys Dept ER Caianiello, Fisciano, SA, ItalyAnna Maria Cucolo - Univ Salerno, Phys Dept ER Caianiello, Fisciano, SA, ItalyMaria Iavarone - Temple Univ, Dept Phys, Philadelphia, PA 19122 USAAlessandro Scarfato - Univ Salerno, Phys Dept ER Caianiello, Fisciano, SA, ItalyGoran Karapetrov - Drexel UniversitySteven Alan Moore - Temple Univ, Dept Phys, Philadelphia, PA 19122 USAMassimiliano Polichetti - Univ Salerno, Phys Dept ER Caianiello, Fisciano, SA, ItalyDavide Mancusi - Univ Salerno, Phys Dept ER Caianiello, Fisciano, SA, ItalySandro Pace - Univ Salerno, Phys Dept ER Caianiello, Fisciano, SA, ItalyValentyn Novosad - Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USAVolodymir Yefremenko - Argonne Natl Lab, Div Mat Sci, 9700 S Cass Ave, Argonne, IL 60439 USAFabrizio Bobba - Univ Salerno, Phys Dept ER Caianiello, Fisciano, SA, Italy
- Contributors
- H PerezDeTejada (Editor)
- Publication Details
- pp.83-106
- Publisher
- Intech Europe; RIJEKA
- Number of pages
- 24
- Resource Type
- Book chapter
- Language
- English
- Academic Unit
- Physics
- Identifiers
- 991019168046704721
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