Improved spectral stability in spin transfer nano-oscillators: single vortex versus coupled vortices dynamics

Nicolas Locatelli 1, 2 Romain Lebrun 1, 2 Vladimir V. Naletov 1, 2, 3, 4, 5 Abbass Hamadeh 4 G. de Loubens 4 Olivier Klein 4, 5 Julie Grollier 1, 2 Vincent Cros 1, 2
1 UMP CNRS/THALES - Unité mixte de physique CNRS/Thalès
2 IEF - Institut d'électronique fondamentale
3 KPFU - Kazan State University
4 SPEC - UMR3680 - Service de physique de l'état condensé
5 SPINTEC - SPINtronique et TEchnologie des Composants
Abstract : We perform a comparative study of spin transfer induced excitation of the gyrotropic motion of a vortex core with either uniform or vortex spin polarizers. The microwave output voltage associated with the vortex dynamics, detected in both cases, displays a strong reduction of phase fluctuations in the case of the vortex polarizer, with a decrease of the peak linewidth by one order of magnitude down to 200kHz at zero field. A thorough study of rf emission features for the different accessible vortex configurations shows that this improvement is related to the excitation of coupled vortex dynamics by spin transfer torques.
Keywords : Spin transfer nano-oscillators Spin transfer torque Vortex Gyrotropic mode Coupled oscillators Self- sustained magnetic oscillations Radio frequency Microwave
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Nicolas Locatelli, Romain Lebrun, Vladimir V. Naletov, Abbass Hamadeh, G. de Loubens, et al.. Improved spectral stability in spin transfer nano-oscillators: single vortex versus coupled vortices dynamics. IEEE Transactions on Magnetics, Institute of Electrical and Electronics Engineers, 2015, ⟨10.1109/TMAG.2015.2414903⟩. ⟨cea-01364272⟩

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