We have demonstrated spin injection from a full Heusler alloy Co2MnGa thin film into a (100) InGaAs quantum well in a semiconductor light-emitting diode structure at a temperature of 5 K. The detection is performed in the oblique Hanle geometry, allowing quantification of the effective spin lifetime and spin detection efficiency (22 +/- 4%). This work builds on existing studies on off-stoichiometric Heusler injectors into similar light-emitting-diode structures. The role of injector stoichiometry can therefore be quantitatively assessed with the result that the spin injection efficiency increases by a factor of approximately 2 as compared with an off-stoichiometric Co2.4Mn1.6Ga injector. (C) 2008 American Institute of Physics.
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Hickey, M. C., Damsgaard, C. D., Holmes, S. N., Farrer, I., Jones, G. A. C., Ritchie, D. A., Jacobsen, C. S., Hansen, J. B., & Pepper, M. (2008). Spin injection from Co2MnGa into an InGaAs quantum well. Applied Physics Letters, 92(23), 232101. https://doi.org/10.1063/1.2938418