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Spin-Orbit twisted spin waves - Florent Perez - Mardi 8 mars 2016 à 11h

INSP - 4 place Jussieu - 75252 PARIS Cedex 05 - Barre 22-32 - 2e étage, salle 201

Florent Perez - INSP - Equipe Nanostructures et systèmes quantiques

Interest in spin waves has risen in recent years in the context of spintronics. Indeed, spin waves could offer a low-dissipation alternative to traditional methods for transporting and treating information. However, such a vision creates the need for controlling their propagation by electrical, magnetic and optical means - a challenge that remains still largely unmet. Spin-orbit interaction has emerged as an important protagonist. Here we study the interplay between spin-orbit and exchange interactions when thay are involved in a spin-wave in a conducting system. We introduce the concept of twisted spin waves. We use inelastic light scattering to measure the dispersion and the damping rate of twisted spin waves in a magnetic two-dimensional electron gas with broken inversion symmetry. With a secondary laser beam, we vary the strength of this coupling to alter the propagation of the spin wave . Our results demonstrate the exciting possibility of controlling the direction and velocity of spin waves by optical or electrical gating. They pave the way for novel applications in spin-wave based transistors, spin-wave routing devices or for the realization of lenses for spin waves.