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

On November, 20, we have the pleasure to welcome Romain Lebrun from University Johannes Gutenberg, Mainz, Germany. At 11H, room 434 A, he will present give a talk on “Mutual synchronization of spin torque nano-oscillators through a long-range and tunable electrical coupling scheme”.

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].
Finally, I will quickly present some of my recent works and projects on controlling the dynamics of antiferromagnets.

[1] R. Lebrun, S. Tsunegi, P. Bortolotti, H. Kubota, A. S. Jenkins, M. Romera, K. Yakushiji, A. Fukushima, J. Grollier, S. Yuasa, and V. Cros, Nat. Comm. 8, 15825 (2017).
[2] R. Lebrun, A. Jenkins, A. Dussaux, N. Locatelli, S. Tsunegi, E. Grimaldi, H. Kubota, P. Bortolotti, K. Yakushiji, J. Grollier, A. Fukushima, S. Yuasa, and V. Cros, Physical Review Letters 115, (2015).
[3] A. S. Jenkins, R. Lebrun, E. Grimaldi, S. Tsunegi, P. Bortolotti, H. Kubota, K. Yakushiji, A. Fukushima, G. de Loubens, O. Klein, S. Yuasa, and V. Cros, Nat. Nanotech. 11, 360 (2016).
[4] M. Kreissig, R Lebrun, F Protze, KJ Merazzo, J Hem, L Vila, R Ferreira, MC Cyrille, F Ellinger, V Cros, U Ebels, and P Bortolotti AIP Advances 7, 056653 (2017).
[5] M. Romera, P. Talatchian, S. Tsunegi, F. A. Araujo, V.t Cros, P. Bortolotti, K. Yakushiji, A. Fukushima, H. Kubota, S. Yuasa, D. Vodenicarevic, N. Locatelli, D. Querlioz, J. Grollier, arXiv:1711.02704 (2017).

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