Spin injector light emission system

A spin-LED or spin-laser light emission system comprising:

• a stack (STA) deposited on a substrate (Sub) along an axis Z perpendicular to the plane XY of the substrate and comprising an active layer (AL) and transport layers, an electrode referred to as anode (An) and an electrode referred to as cathode (Cath), configured to generate charge carriers that pass through the stack to the active layer, a device referred to as spin injector (SID), deposited on said stack and comprising:
• an assembly of at least one first layer (L1) made of ferromagnetic material and at least one second layer (L2) made of metal material, said assembly having a bar structure referred to as a Hall bar (HB) along an axis X and having a first end and a second end, a first electrode (EL1) and a second electrode (EL2), referred to as spin electrodes, in electrical contact with the first and the second end of the Hall bar, respectively, and configured to generate, in the Hall bar, a pulsed current I along the axis X in a first direction or a second direction opposite the first direction,
• the emission system being configured such that the cathode is in electrical contact with the Hall bar of the spin injector,
• said spin injector being configured to have a magnetization (M) along Z and such that a reversal of the direction of the current I reverses the direction of the magnetization (M), switching of the magnetization of the spin injector inducing a change in the circular polarization state of light (EL) emitted by the emission system.