Spin dependent transport properties in spin-LEDs, a survey

摘要

Optical characterization is a powerful tool for assessment of spin-injection properties in spin-LEDs. We show a comparison of spin-dependent transport properties in LEDs with different spin-injector structures including ferromagnet/tunnel-barrier or Schottky-barrier injectors and magnetic semiconductors. Using these devices, room temperature spin-injection and voltage-controlled injection has been achieved. The optical technique used is the Oblique Hanle Effect. Features such as spin-nuclear interactions can be clearly demonstrated in such spin-LED structures. Finally we discuss the design of a spin-dependent contact that can supply both electrical spin injection as electrical spin detection.