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

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 (STNO). It is characterized by the in-plane circular precession associated with a C-shaped magnetization distribut...

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Bibliographic Details
Published in:Applied physics letters 2021-01, Vol.118 (1)
Main Authors: Wittrock, Steffen, Talatchian, Philippe, Romera, Miguel, Menshawy, Samh, Jotta Garcia, Mafalda, Cyrille, Marie-Claire, Ferreira, Ricardo, Lebrun, Romain, Bortolotti, Paolo, Ebels, Ursula, Grollier, Julie, Cros, Vincent
Format: Article
Language:English
Subjects:
Applied physics
Magnetic disks
Optimal control
Oscillators
Physics
Spin dynamics
Stability
Stochastic processes
Torque
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Summary: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 (STNO). It is characterized by the in-plane circular precession associated with a C-shaped magnetization distribution. We show a transition between G- and C-state modes, which is found to be stochastic in a current-controllable range. Supporting our experimental findings with micromagnetic simulations, we believe that the results provide further opportunities for the dynamic and stochastic control of STNOs, which could be interesting to be implemented, for example, in neuromorphic networks.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0029083