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

Nicolas Locatelli; Romain Lebrun; Vladimir V. Naletov; Abbass Hamadeh; G. de Loubens; Olivier Klein; Julie Grollier; Vincent Cros

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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Journal articles

Domain :

Physics [physics]

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

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