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

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.
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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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