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We have studied hyperfine interactions between spin-polarized electrons andlattice nuclei in Al_0.1Ga_0.9As/GaAs quantum well (QW) heterostructures. Thespin-polarized electrons are electrically injected into the semiconductorheterostructure from a metallic ferromagnet across a Schottky tunnel barrier.The spin-polarized electron current dynamically polarizes the nuclei in the QW,and the polarized nuclei in turn alter the electron spin dynamics. Thesteady-state electron spin is detected via the circular polarization of theemitted electroluminescence. The nuclear polarization and electron spindynamics are accurately modeled using the formalism of optical orientation inGaAs. The nuclear spin polarization in the QW is found to depend strongly onthe electron spin polarization in the QW, but only weakly on the electrondensity in the QW. We are able to observe nuclear magnetic resonance (NMR) atlow applied magnetic fields on the order of a few hundred Oe by electricallymodulating the spin injected into the QW. The electrically driven NMRdemonstrates explicitly the existence of a Knight field felt by the nuclei dueto the electron spin.Comment: 19 Figures - submitted to PR

physical review. b, condensed matter and materials physics

Electron spin dynamics and hyperfine interactions in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi><mml:mo>∕</mml:mo><mml:msub><mml:mi mathvariant="normal">Al</mml:mi><mml:mn>0.1</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ga</mml:mi><mml:mn>0.9</mml:mn></mml:msub><mml:mi mathvariant="normal">As</mml:mi><mml:mo>∕</mml:mo><mml:mi mathvariant="normal">Ga</mml:mi><mml:mi mathvariant="normal">As</mml:mi></mml…

Electron spin dynamics and hyperfine interactions inFe∕Al0.1Ga0.9As∕GaAs