Optical Detection of the Cyclotron Resonance in Inhomogeneous Ferromagnetic Structures InGaAs/GaAs/δ-〈Mn〉

Structures consisting of an InGaAs/GaAs quantum well and a ferromagnetic 〈Mn〉 δ layer separated by narrow 3–10 nm spacer have been studied using the optically detected cyclotron resonance (ODCR). Despite strong disorder in these structures, photoluminescence charge carriers indicates ODCR upon absorption far infrared regions with maximum magnetic fields much lower than those expected for typical electron or hole mass. The extraordinary manifestation is due to dimensional magnetoplasma two-dimensional degenerate holes submicron high-quality well, which appear fluctuation Coulomb potential because mesoscopic separation high-density acceptor layer. Magnetic force microscopy also inhomogeneity structure plane characteristic scale ~100–200 below Curie temperature At same time, field light-emitting diode on n -GaAs substrate noticeably that insulating i substrate, explained donors doped substrate.