Chimeras and complex cluster states in arrays of spin-torque oscillators

Abstract We consider synchronization properties of arrays of spin-torque nano-oscillators coupled via an RC load. We show that while the fully synchronized state of identical oscillators may be locally stable in some parameter range, this synchrony is not globally attracting. Instead, regimes of dif...

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Autores principales:	Michael Zaks, Arkady Pikovsky
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/54a22c78dad74e749c85b207a8eb2d4b
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spelling	oai:doaj.org-article:54a22c78dad74e749c85b207a8eb2d4b2021-12-02T16:07:05ZChimeras and complex cluster states in arrays of spin-torque oscillators10.1038/s41598-017-04918-92045-2322https://doaj.org/article/54a22c78dad74e749c85b207a8eb2d4b2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04918-9https://doaj.org/toc/2045-2322Abstract We consider synchronization properties of arrays of spin-torque nano-oscillators coupled via an RC load. We show that while the fully synchronized state of identical oscillators may be locally stable in some parameter range, this synchrony is not globally attracting. Instead, regimes of different levels of compositional complexity are observed. These include chimera states (a part of the array forms a cluster while other units are desynchronized), clustered chimeras (several clusters plus desynchronized oscillators), cluster state (all oscillators form several clusters), and partial synchronization (no clusters but a nonvanishing mean field). Dynamically, these states are also complex, demonstrating irregular and close to quasiperiodic modulation. Remarkably, when heterogeneity of spin-torque oscillators is taken into account, dynamical complexity even increases: close to the onset of a macroscopic mean field, the dynamics of this field is rather irregular.Michael ZaksArkady PikovskyNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Michael Zaks Arkady Pikovsky Chimeras and complex cluster states in arrays of spin-torque oscillators
description	Abstract We consider synchronization properties of arrays of spin-torque nano-oscillators coupled via an RC load. We show that while the fully synchronized state of identical oscillators may be locally stable in some parameter range, this synchrony is not globally attracting. Instead, regimes of different levels of compositional complexity are observed. These include chimera states (a part of the array forms a cluster while other units are desynchronized), clustered chimeras (several clusters plus desynchronized oscillators), cluster state (all oscillators form several clusters), and partial synchronization (no clusters but a nonvanishing mean field). Dynamically, these states are also complex, demonstrating irregular and close to quasiperiodic modulation. Remarkably, when heterogeneity of spin-torque oscillators is taken into account, dynamical complexity even increases: close to the onset of a macroscopic mean field, the dynamics of this field is rather irregular.
format	article
author	Michael Zaks Arkady Pikovsky
author_facet	Michael Zaks Arkady Pikovsky
author_sort	Michael Zaks
title	Chimeras and complex cluster states in arrays of spin-torque oscillators
title_short	Chimeras and complex cluster states in arrays of spin-torque oscillators
title_full	Chimeras and complex cluster states in arrays of spin-torque oscillators
title_fullStr	Chimeras and complex cluster states in arrays of spin-torque oscillators
title_full_unstemmed	Chimeras and complex cluster states in arrays of spin-torque oscillators
title_sort	chimeras and complex cluster states in arrays of spin-torque oscillators
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/54a22c78dad74e749c85b207a8eb2d4b
work_keys_str_mv	AT michaelzaks chimerasandcomplexclusterstatesinarraysofspintorqueoscillators AT arkadypikovsky chimerasandcomplexclusterstatesinarraysofspintorqueoscillators
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Chimeras and complex cluster states in arrays of spin-torque oscillators

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