Mutual synchronization of spin-torque oscillators within a ring array

An array of spin torque nano-oscillators (STNOs), coupled by dipolar interaction and arranged on a ring, has been studied numerically and analytically. The phase patterns and locking ranges are extracted as a function of the number N , their separation, and the current density mismatch between selec...

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Bibliographic Details
Published inScientific reports Vol. 12; no. 1; p. 12030
Main Authors Castro, M. A., Mancilla-Almonacid, D., Dieny, B., Allende, S., Buda-Prejbeanu, L. D., Ebels, U.
Format Journal Article
LanguageEnglish
Published London Nature Publishing Group UK 14.07.2022
Nature Publishing Group
Nature Portfolio
Subjects
639/766/25
639/925
Approximation
Arrays
Humanities and Social Sciences
multidisciplinary
Oscillators
Science
Science (multidisciplinary)
Synchronization
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Summary:An array of spin torque nano-oscillators (STNOs), coupled by dipolar interaction and arranged on a ring, has been studied numerically and analytically. The phase patterns and locking ranges are extracted as a function of the number N , their separation, and the current density mismatch between selected subgroups of STNOs. If N ≥ 6 for identical current densities through all STNOs, two degenerated modes are identified an in-phase mode (all STNOs have the same phase) and a splay mode (the phase makes a 2 π turn along the ring). When inducing a current density mismatch between two subgroups, additional phase shifts occur. The locking range (maximum current density mismatch) of the in-phase mode is larger than the one for the splay mode and depends on the number N of STNOs on the ring as well as on the separation. These results can be used for the development of magnetic devices that are based on STNO arrays.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-022-15483-1