Regensburg 2019 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 8: Magnonics
MA 8.12: Vortrag
Montag, 1. April 2019, 18:00–18:15, H52
Propagating magnetic droplet solitons as moveable nano-scale spin-wave sources — •Morteza Mohseni1, Thomas Brächer1, Qi Wang1, Majid Mohseni2, Burkard Hillebrands1, and Philipp Pirro1 — 1Fachbereich Physik and Landesforschungszentrum OPTIMAS, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany. — 2Faculty of Physics, Shahid Beheshti University, Evin, Tehran 19839, Iran
Magnetic droplet solitons are strongly nonlinear magnetic nano-objects which can be formed in spin torque nano-oscillators with large perpendicular magnetic anisotropies. The droplet is a localized magnetodynamical soliton which can only be stabilized in the presence of the applied spin transfer torque. However, a propagating droplet can be an attractive information carrier since it can transport energy and momentum at the same time. Here, we propose a simple way to launch droplets in an inhomogeneous waveguide. We use the drift motion of a droplet and we show that in a system with broken translational symmetry, the droplet acquires momentum and starts to propagate. By using numerical simulations, we find that the droplet velocity is tunable via the strength of the broken symmetry and the size of the nano-contact. In addition, we demonstrate that the launched droplet can propagate up to several micrometers in a realistic system with reasonable damping. Finally, we demonstrate how a blowing droplet delivers its momentum to a highly non-reciprocal spin-wave burst. Such a propagating droplet can be used as a moveable spin-wave source in nano-scale magnonic networks.