Chaos in Magnetic Nanocontact Vortex Oscillators
| Autor: | Damien Rontani, Jérémy Létang, Claude Chappert, J.-P. Adam, Vincent Cros, Stéphanie Girod, Sébastien Petit-Watelot, Myoung-Woo Yoo, Thibaut Devolder, Stéphane Andrieu, Karim Bouzehouane, Marc Sciamanna, Joo-Von Kim |
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| Přispěvatelé: | Centre de Nanosciences et Nanotechnologies (C2N (UMR_9001)), Université Paris-Sud - Paris 11 (UP11)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Matériaux Optiques, Photonique et Systèmes (LMOPS), CentraleSupélec-Université de Lorraine (UL), Chaire Photonique, CentraleSupélec-Université de Lorraine (UL)-CentraleSupélec-Université de Lorraine (UL), Institut Jean Lamour (IJL), Université de Lorraine (UL)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Unité mixte de physique CNRS/Thales (UMPhy CNRS/THALES), THALES-Centre National de la Recherche Scientifique (CNRS), IMPACT N4S, ANR-15-IDEX-0004,LUE,Isite LUE(2015) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
Physics
Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics General Physics and Astronomy FOS: Physical sciences Nonlinear Sciences - Chaotic Dynamics 01 natural sciences Gyration Vortex Condensed Matter::Superconductivity [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other] 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) [PHYS.COND.CM-MS]Physics [physics]/Condensed Matter [cond-mat]/Materials Science [cond-mat.mtrl-sci] Chaotic Dynamics (nlin.CD) 010306 general physics Frequency modulation |
| Zdroj: | Physical Review Letters Physical Review Letters, American Physical Society, 2019, 123 (14), ⟨10.1103/PhysRevLett.123.147701⟩ |
| ISSN: | 0031-9007 1079-7114 |
| DOI: | 10.1103/PhysRevLett.123.147701⟩ |
| Popis: | We present an experimental study of spin-torque driven vortex self-oscillations in magnetic nanocontacts. We find that above a certain threshold in applied currents, the vortex gyration around the nanocontact is modulated by relaxation oscillations, which involve periodic reversals of the vortex core. This modulation leads to the appearance of commensurate but also more interestingly here, incommensurate states, which are characterized by devil's staircases in the modulation frequency. We use frequency- and time-domain measurements together with advanced time-series analyses to provide experimental evidence of chaos in incommensurate states of vortex oscillations, in agreement with theoretical predictions. Comment: 5 pages, 4 figures |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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