Mutual synchronization of spin torque nano-oscillators through a long-range and tunable electrical coupling scheme

Orateur : Romain LEBRUN (Unité Mixte de Physique CNRS/Thales, Palaiseau, France - now at : University Johannes Gutenberg, Mainz, Germany)

The concept of spin-torque-driven high-frequency magnetization dynamics, allows the potential construction of complex networks of non-linear dynamical nanoscale systems, combining the field of spintronics and the study of non-linear systems. In the few previous demonstrations of synchronization of several spin-torque oscillators, the short-range nature of the magnetic coupling that is used has largely hampered a complete control of the synchronization process. Here I will show that we recently demonstrate the successful mutual synchronization of two spin-torque oscillators with a large separation distance through their long range self-emitted microwave currents [1]. In the synchronized state, the spectral coherence and the output power are respectively enhanced by a factor N (2) and N2 (4). The full control of the synchronized state is achieved at the nanoscale through two active spin transfer torques [2,3], but also externally through an electrical delay line. These additional levels of control of the synchronization capability provide a new approach to develop spin-torque oscillator-based nanoscale rf-devices going from rf-sources to bio-inspired networks [5].

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