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.
References:
[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).