Control of light polarization using spin-injected opto-electronic devices with vertical geometries

International audience; In the past decade, a continous interest and a research effort have been dedicated to the study of spin injection into Semiconductor-based Light Emitting Device such as Spin-Light Emitting Diodes (Spin-LEDs) [1,2] and more recently Spin-LASERs such as Vertical Cavity Surface Emitting LASERs (VCSELs) [3]. We will first focus on structural characterization and optical polarization efficiency of Ta/CoFeB/MgO spin injector grown on the top of an InGaAs-QW LED. We will show that for very thin layer of CoFeB it is possible to induce Perpendicular Magnetic Anisotropy leading to emission of polarized light at remanence (i.e. without external magnetic field). A natural extens…