期刊
PHYSICAL REVIEW LETTERS
卷 123, 期 14, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.147701
关键词
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资金
- Agence Nationale de la Recherche [ANR-17-CE24-0008]
- Horizon 2020 Research Framework Programme of the European Commission [751344]
- French RENATECH network
- European Regional Development Fund (European Commission) (ERDF)
- Ministry of Higher Education and Research (FNADT)
- Moselle Department
- Grand Est Region
- Metz Metropole
- AIRBUS-GDI Simulation
- CentraleSupelec
- Fondation Supelec
- Agence Nationale de la Recherche (ANR) [ANR-17-CE24-0008] Funding Source: Agence Nationale de la Recherche (ANR)
- Marie Curie Actions (MSCA) [751344] Funding Source: Marie Curie Actions (MSCA)
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 arc 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.
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