Vortex lattice dynamics in Nb films with competing intrinsic random and artificial periodic pinning

We study vortex lattice (VL) dynamics in patterned Nb films containing dense periodic arrays of sub 50nm magnetic nanodots or holes, by means of ac susceptibility measurements. For both types of samples, we observe matching effects within a wide temperature range, determined by the periodicity of th...

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Autores principales: Chiliotte, C., Pasquini, G., Bekeris, V., Villegas, J.E., Li, C.-P., Schuller, I.K.
Formato: JOUR
Materias:
Hysteresis
Magnetic susceptibility
Superconducting materials
Temperature
Vortex flow
Ac-susceptibility measurements
Artificial pinning
Hysteretic behavior
Magnetic nano-dots
Matching effects
Periodic pinning
Vortex lattice dynamics
Wide temperature ranges
Crystal lattices
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09532048_v24_n6_p_Chiliotte
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
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spelling todo:paper_09532048_v24_n6_p_Chiliotte2023-10-03T15:50:48Z Vortex lattice dynamics in Nb films with competing intrinsic random and artificial periodic pinning Chiliotte, C. Pasquini, G. Bekeris, V. Villegas, J.E. Li, C.-P. Schuller, I.K. Hysteresis Magnetic susceptibility Superconducting materials Temperature Vortex flow Ac-susceptibility measurements Artificial pinning Hysteretic behavior Magnetic nano-dots Matching effects Periodic pinning Vortex lattice dynamics Wide temperature ranges Crystal lattices We study vortex lattice (VL) dynamics in patterned Nb films containing dense periodic arrays of sub 50nm magnetic nanodots or holes, by means of ac susceptibility measurements. For both types of samples, we observe matching effects within a wide temperature range, determined by the periodicity of the strong artificial pinning potential. Below a crossover reduced temperature t* = 0.75, the ac vortex mobility and matching fields are different for increasing or decreasing fields. Low temperature field cooling experiments indicate that the hysteretic behavior is not related to different intensities of magnetic induction B in the ac penetrated region of the samples. The fact that hysteresis appears in both patterned samples when the intrinsic random pinning becomes stronger, together with the absence of hysteresis in a reference unpatterned Nb film, suggests that the interplay between random and periodic pinning, independent of its origin, induces VL metastability below t*, which leads to the observed irreversibility. © 2011 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09532048_v24_n6_p_Chiliotte
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic Hysteresis
Magnetic susceptibility
Superconducting materials
Temperature
Vortex flow
Ac-susceptibility measurements
Artificial pinning
Hysteretic behavior
Magnetic nano-dots
Matching effects
Periodic pinning
Vortex lattice dynamics
Wide temperature ranges
Crystal lattices
spellingShingle Hysteresis
Magnetic susceptibility
Superconducting materials
Temperature
Vortex flow
Ac-susceptibility measurements
Artificial pinning
Hysteretic behavior
Magnetic nano-dots
Matching effects
Periodic pinning
Vortex lattice dynamics
Wide temperature ranges
Crystal lattices
Chiliotte, C.
Pasquini, G.
Bekeris, V.
Villegas, J.E.
Li, C.-P.
Schuller, I.K.
Vortex lattice dynamics in Nb films with competing intrinsic random and artificial periodic pinning
topic_facet Hysteresis
Magnetic susceptibility
Superconducting materials
Temperature
Vortex flow
Ac-susceptibility measurements
Artificial pinning
Hysteretic behavior
Magnetic nano-dots
Matching effects
Periodic pinning
Vortex lattice dynamics
Wide temperature ranges
Crystal lattices
description We study vortex lattice (VL) dynamics in patterned Nb films containing dense periodic arrays of sub 50nm magnetic nanodots or holes, by means of ac susceptibility measurements. For both types of samples, we observe matching effects within a wide temperature range, determined by the periodicity of the strong artificial pinning potential. Below a crossover reduced temperature t* = 0.75, the ac vortex mobility and matching fields are different for increasing or decreasing fields. Low temperature field cooling experiments indicate that the hysteretic behavior is not related to different intensities of magnetic induction B in the ac penetrated region of the samples. The fact that hysteresis appears in both patterned samples when the intrinsic random pinning becomes stronger, together with the absence of hysteresis in a reference unpatterned Nb film, suggests that the interplay between random and periodic pinning, independent of its origin, induces VL metastability below t*, which leads to the observed irreversibility. © 2011 IOP Publishing Ltd.
format JOUR
author Chiliotte, C.
Pasquini, G.
Bekeris, V.
Villegas, J.E.
Li, C.-P.
Schuller, I.K.
author_facet Chiliotte, C.
Pasquini, G.
Bekeris, V.
Villegas, J.E.
Li, C.-P.
Schuller, I.K.
author_sort Chiliotte, C.
title Vortex lattice dynamics in Nb films with competing intrinsic random and artificial periodic pinning
title_short Vortex lattice dynamics in Nb films with competing intrinsic random and artificial periodic pinning
title_full Vortex lattice dynamics in Nb films with competing intrinsic random and artificial periodic pinning
title_fullStr Vortex lattice dynamics in Nb films with competing intrinsic random and artificial periodic pinning
title_full_unstemmed Vortex lattice dynamics in Nb films with competing intrinsic random and artificial periodic pinning
title_sort vortex lattice dynamics in nb films with competing intrinsic random and artificial periodic pinning
url http://hdl.handle.net/20.500.12110/paper_09532048_v24_n6_p_Chiliotte
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AT pasquinig vortexlatticedynamicsinnbfilmswithcompetingintrinsicrandomandartificialperiodicpinning
AT bekerisv vortexlatticedynamicsinnbfilmswithcompetingintrinsicrandomandartificialperiodicpinning
AT villegasje vortexlatticedynamicsinnbfilmswithcompetingintrinsicrandomandartificialperiodicpinning
AT licp vortexlatticedynamicsinnbfilmswithcompetingintrinsicrandomandartificialperiodicpinning
AT schullerik vortexlatticedynamicsinnbfilmswithcompetingintrinsicrandomandartificialperiodicpinning
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