Vortex pinning vs superconducting wire network: origin of periodic oscillations induced by applied magnetic fields in superconducting films with arrays of nanomagnets
Hybrid magnetic arrays embedded in superconducting films are ideal systems to study the competition between different physical (such as the coherence length) and structural length scales such as are available in artificially produced structures. This interplay leads to oscillation in many magnetical...
| Autores: | , , , , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2014 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/35472 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/35472 |
| Access Level: | acceso abierto |
| Palabra clave: | 538.9 Weak links Thin-films Transition Temperature Lattices Size Dots Física de materiales Física del estado sólido 2211 Física del Estado Sólido |
| Sumario: | Hybrid magnetic arrays embedded in superconducting films are ideal systems to study the competition between different physical (such as the coherence length) and structural length scales such as are available in artificially produced structures. This interplay leads to oscillation in many magnetically dependent superconducting properties such as the critical currents, resistivity and magnetization. These effects are generally analyzed using two distinct models based on vortex pinning or wire network. In this work, we show that for magnetic dot arrays, as opposed to antidot (i.e. holes) arrays, vortex pinning is the main mechanism for field induced oscillations in resistance R(H), critical current I-c(H), magnetization M(H) and ac-susceptibility chi(ac)(H) in a broad temperature range. Due to the coherence length divergence at T-c, a crossover to wire network behaviour is experimentally found. While pinning occurs in a wide temperature range up to T-c, wire network behaviour is only present in a very narrow temperature window close to T-c. In this temperature interval, contributions from both mechanisms are operational but can be experimentally distinguished. |
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