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arXiv · 1501.07839

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

Nicolas Locatelli·Romain Lebrun·Vladimir V. Naletov·Abbass Hamadeh·Grégoire De Loubens·Olivier Klein·Julie Grollier·Vincent Cros
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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, Grégoire De Loubens, Olivier Klein, Julie Grollier, Vincent Cros. 2015-01-30. Improved spectral stability in spin transfer nano-oscillators: single vortex versus coupled vortices dynamics. https://doi.org/10.1109/tmag.2015.2414903

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