Abstract
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 was used has largely hampered a complete control of the synchronization process. Here we demonstrate the successful mutual synchronization of two spin-torque oscillators with a large separation distance through their long range self-emitted microwave currents. This leads to a strong improvement of both the emitted power and the linewidth. The full control of the synchronized state is achieved at the nanoscale through two active spin transfer torques, 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 microwave-devices going from microwave-sources to bio-inspired networks.
Highlights
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
The main purpose of this study is to investigate the electrical coupling between two widely spaced spin torque oscillators (STOs) as a possible source of interaction to reach an optimal state of in-phase and coherently mutually synchronized STOs
The microwave signal emitted by both oscillators is the coupling mechanism driving the mutual synchronization process, achieved by having the microwave ports of the two bias tees electrically connected through microwave cables and a tunable delay line (Fig. 1)
Summary
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. The full control of the synchronized state is achieved at the nanoscale through two active spin transfer torques, and 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 microwave-devices going from microwavesources to bio-inspired networks. The full control of the synchronization capability allows the enhancement of the usually observed low power and poor spectral coherence of these oscillators, which is vitally important for the development of nanoscale microwave devices This should allow fine-tuning of the coupling constant between each oscillator inside a network, a crucial step for mimicking basic functionalities of the brain[12,16,17,18] in nanoscale bio-inspired devices
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