Author:
Wittrock Steffen,Talatchian Philippe,Tsunegi Sumito,Crété Denis,Yakushiji Kay,Bortolotti Paolo,Ebels Ursula,Fukushima Akio,Kubota Hitoshi,Yuasa Shinji,Grollier Julie,Cibiel Gilles,Galliou Serge,Rubiola Enrico,Cros Vincent
Abstract
AbstractThe correlation of phase fluctuations in any type of oscillator fundamentally defines its spectral shape. However, in nonlinear oscillators, such as spin torque nano-oscillators, the frequency spectrum can become particularly complex. This is specifically true when not only considering thermal but also colored 1/f flicker noise processes, which are crucial in the context of the oscillator’s long term stability. In this study, we address the frequency spectrum of spin torque oscillators in the regime of large-amplitude steady oscillations experimentally and as well theoretically. We particularly take both thermal and flicker noise into account. We perform a series of measurements of the phase noise and the spectrum on spin torque vortex oscillators, notably varying the measurement time duration. Furthermore, we develop the modelling of thermal and flicker noise in Thiele equation based simulations. We also derive the complete phase variance in the framework of the nonlinear auto-oscillator theory and deduce the actual frequency spectrum. We investigate its dependence on the measurement time duration and compare with the experimental results. Long term stability is important in several of the recent applicative developments of spin torque oscillators. This study brings some insights on how to better address this issue.
Funder
LABEX FIRST-TF
Agence Nationale de la Recherche
Publisher
Springer Science and Business Media LLC
Cited by
4 articles.
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