Anomalies in vortex lattice dynamics driven by induced ac currents in superconducting films with magnetic arrays of two-fold symmetry
We study the dynamics of the vortex lattice driven by ac induced currents in the critical state regime, for T>0.70 T C . The samples are superconducting films grown on top of two-fold symmetry array of magnetic dots. In these heterostructures, the induced ac currents flow parallel to the shor...
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2015
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| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09532048_v28_n1_p_Moreno http://hdl.handle.net/20.500.12110/paper_09532048_v28_n1_p_Moreno |
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paper:paper_09532048_v28_n1_p_Moreno2023-06-08T15:55:06Z Anomalies in vortex lattice dynamics driven by induced ac currents in superconducting films with magnetic arrays of two-fold symmetry Pasquini, Gabriela Bekeris, Victoria Isabel ac induced currents superconducting film two-fold magnetic array vortex lattice Critical current density (superconductivity) Lattice vibrations Magnetic field effects Magnetic permeability Magnetic susceptibility Parallel flow Superconducting films Temperature distribution Ac susceptibility Applied magnetic fields Magnetic arrays Temperature dependence Vortex configurations Vortex lattice dynamics Vortex lattices Vortex-vortex interaction Vortex flow We study the dynamics of the vortex lattice driven by ac induced currents in the critical state regime, for T>0.70 T C . The samples are superconducting films grown on top of two-fold symmetry array of magnetic dots. In these heterostructures, the induced ac currents flow parallel to the short and to the long side of the pinning array in different areas of the samples simultaneously. This behavior produces remarkable effects in the vortex lattice dynamics. First of all, periodic features are observed in the ac susceptibility versus applied magnetic field measurements which are related to matching effects between the vortex lattices and the magnetic array. However, the vortex lattice reconfiguration observed in magnetotransport experiments is absent. Some of these features are revealed as maxima instead of being minima, indicating higher mobility at certain matching fields. Competing unstable vortex configurations could lead to increase vortex mobility precluding the reconfiguration transition. At high temperatures, where the matching effects show up, the magnetic permeability of the dots is the mechanism that governs the J C (T) behavior. Moreover, the temperature dependence of the pinning force F P (T) shows a temperature crossover related to an unexpected enhancement in vortex mobility. Vortex-vortex interaction and the interplay between trapped and interstitial vortices are a hint to explain these phenomena. © 2015 IOP Publishing Ltd. Fil:Pasquini, G. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Bekeris, V. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. 2015 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09532048_v28_n1_p_Moreno http://hdl.handle.net/20.500.12110/paper_09532048_v28_n1_p_Moreno |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
ac induced currents superconducting film two-fold magnetic array vortex lattice Critical current density (superconductivity) Lattice vibrations Magnetic field effects Magnetic permeability Magnetic susceptibility Parallel flow Superconducting films Temperature distribution Ac susceptibility Applied magnetic fields Magnetic arrays Temperature dependence Vortex configurations Vortex lattice dynamics Vortex lattices Vortex-vortex interaction Vortex flow |
| spellingShingle |
ac induced currents superconducting film two-fold magnetic array vortex lattice Critical current density (superconductivity) Lattice vibrations Magnetic field effects Magnetic permeability Magnetic susceptibility Parallel flow Superconducting films Temperature distribution Ac susceptibility Applied magnetic fields Magnetic arrays Temperature dependence Vortex configurations Vortex lattice dynamics Vortex lattices Vortex-vortex interaction Vortex flow Pasquini, Gabriela Bekeris, Victoria Isabel Anomalies in vortex lattice dynamics driven by induced ac currents in superconducting films with magnetic arrays of two-fold symmetry |
| topic_facet |
ac induced currents superconducting film two-fold magnetic array vortex lattice Critical current density (superconductivity) Lattice vibrations Magnetic field effects Magnetic permeability Magnetic susceptibility Parallel flow Superconducting films Temperature distribution Ac susceptibility Applied magnetic fields Magnetic arrays Temperature dependence Vortex configurations Vortex lattice dynamics Vortex lattices Vortex-vortex interaction Vortex flow |
| description |
We study the dynamics of the vortex lattice driven by ac induced currents in the critical state regime, for T>0.70 T C . The samples are superconducting films grown on top of two-fold symmetry array of magnetic dots. In these heterostructures, the induced ac currents flow parallel to the short and to the long side of the pinning array in different areas of the samples simultaneously. This behavior produces remarkable effects in the vortex lattice dynamics. First of all, periodic features are observed in the ac susceptibility versus applied magnetic field measurements which are related to matching effects between the vortex lattices and the magnetic array. However, the vortex lattice reconfiguration observed in magnetotransport experiments is absent. Some of these features are revealed as maxima instead of being minima, indicating higher mobility at certain matching fields. Competing unstable vortex configurations could lead to increase vortex mobility precluding the reconfiguration transition. At high temperatures, where the matching effects show up, the magnetic permeability of the dots is the mechanism that governs the J C (T) behavior. Moreover, the temperature dependence of the pinning force F P (T) shows a temperature crossover related to an unexpected enhancement in vortex mobility. Vortex-vortex interaction and the interplay between trapped and interstitial vortices are a hint to explain these phenomena. © 2015 IOP Publishing Ltd. |
| author |
Pasquini, Gabriela Bekeris, Victoria Isabel |
| author_facet |
Pasquini, Gabriela Bekeris, Victoria Isabel |
| author_sort |
Pasquini, Gabriela |
| title |
Anomalies in vortex lattice dynamics driven by induced ac currents in superconducting films with magnetic arrays of two-fold symmetry |
| title_short |
Anomalies in vortex lattice dynamics driven by induced ac currents in superconducting films with magnetic arrays of two-fold symmetry |
| title_full |
Anomalies in vortex lattice dynamics driven by induced ac currents in superconducting films with magnetic arrays of two-fold symmetry |
| title_fullStr |
Anomalies in vortex lattice dynamics driven by induced ac currents in superconducting films with magnetic arrays of two-fold symmetry |
| title_full_unstemmed |
Anomalies in vortex lattice dynamics driven by induced ac currents in superconducting films with magnetic arrays of two-fold symmetry |
| title_sort |
anomalies in vortex lattice dynamics driven by induced ac currents in superconducting films with magnetic arrays of two-fold symmetry |
| publishDate |
2015 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09532048_v28_n1_p_Moreno http://hdl.handle.net/20.500.12110/paper_09532048_v28_n1_p_Moreno |
| work_keys_str_mv |
AT pasquinigabriela anomaliesinvortexlatticedynamicsdrivenbyinducedaccurrentsinsuperconductingfilmswithmagneticarraysoftwofoldsymmetry AT bekerisvictoriaisabel anomaliesinvortexlatticedynamicsdrivenbyinducedaccurrentsinsuperconductingfilmswithmagneticarraysoftwofoldsymmetry |
| _version_ |
1768544648314224640 |