Nonlinear and parametric magneto-elastic dynamics in ferromagnetic nanostructures

We report on transverse magnetic routing of light emission (TMRLE) from excitons in a diluted-magneticsemiconductor quantum well. The strongest directionality is achieved for a quantum well located several tens of nm apart from a metal-semiconductor interface. At such distance the quantum well is coupled to surface plasmon polaritons that carry large transverse spin and are efficiently controlled by the magnetic field direction. We observe directionality of up to 60% for the emission detected from the grating side. When the distance between emitter and surface is large, the transverse spin is caused by the farfield interference effect and the routing is weak. The effect is studied in different geometries regarding the orientation of the plasmonic grating towards excitation and detection.