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Beyond the gyrotropic motion: dynamic C-state in vortex spin torque oscillators

Abstract : In the present study, we investigate a dynamical mode beyond the gyrotropic (G) motion of a magnetic vortex core in a confined magnetic disk of a nano-pillar spin torque nano oscillator. It is characterized by the in-plane circular precession associated to a C-shaped magnetization distribution. We show a transition between G and C-state mode which is found to be purely stochastic in a current-controllable range. Supporting our experimental findings with micromagnetic simulations, we believe that the results provide novel opportunities for the dynamic and stochastic control of STOs, which could be interesting to be implemented for example in neuromorphic networks.
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https://hal.archives-ouvertes.fr/hal-03007041
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Submitted on : Monday, November 16, 2020 - 11:09:15 AM
Last modification on : Wednesday, April 14, 2021 - 3:40:36 AM
Long-term archiving on: : Wednesday, February 17, 2021 - 6:41:10 PM

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  • HAL Id : hal-03007041, version 1

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Steffen Wittrock, Philippe Talatchian, Miguel Rabasa, Samh Menshawy, Mafalda Garcia, et al.. Beyond the gyrotropic motion: dynamic C-state in vortex spin torque oscillators. 2020. ⟨hal-03007041⟩

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