Title: Nuclear spin orientation by electrical spin injection in an AlxGa1-xAs/GaAs spin-polarized light-emitting diode
Authors: Van Dorpe, Pol ×
Van Roy, W
De Boeck, J
Borghs, Gustaaf #
Issue Date: Jul-2005
Publisher: American physical society
Series Title: Physical Review B, Condensed matter and materials physics vol:72 issue:3
Article number: 053515
Abstract: We investigate dynamical nuclear polarization in bulk GaAs by electrical spin injection from a MnSb ferromagnetic top contact using the oblique Hanle effect to examine the circular polarization of the electroluminesence in a spin-polarized light-emitting diode. Reversing the MnSb magnetization or the external field leads to a slow response of the nuclear magnetization, which is reflected in slow changes of the optical circular polarization. Applying an ac-magnetic field at the resonance frequencies of the Ga and As isotopes results in a partial destruction of the nuclear polarization. This also showed that the As-75 nuclei are only weakly polarized. We correlate this to the combination of a higher spin relaxation time of the As-75 nuclei and the relatively long electron-nucleus-interaction time. We furthermore examined the width of the zero-field dip in the Hanle curve and explain its larger size in terms of an equilibrium between nuclear spin pumping by the electrons and nuclear relaxation.
ISSN: 2469-9950
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physics and Astronomy - miscellaneous
Associated Section of ESAT - INSYS, Integrated Systems
× corresponding author
# (joint) last author

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