Spin-injection device prospects for half-metallic Fe3O4:Al0.1Ga0.9As interfaces

R. Mansell, J.-B. Laloë, S.N. Holmes, P.K.J. Wong, Y.B. Xu, I. Farrer, G.A.C. Jones, D.A. Ritchie, C.H.W. Barnes

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    Abstract

    Electrical spin-injection across the Fe3O4:Al0.1Ga0.9As interface has been measured. We quantify this effect in an In0.2Ga0.8As:GaAs spin-light emitting diode optical device. The optical polarization signal is maintained from 4.2 up to 200 K without influence of the metal–insulator Verwey transition in the bulk of the Fe3O4 film. An incomplete oxidation at the interface may be detrimental for this device, as it has a similar spin-injection efficiency to that of Fe:Al0.1Ga0.9As. Ambient temperature operation of this device may be possible although the present polarization levels remain too low for practical spintronic applications. We demonstrate the first step in the integration of molecular beam epitaxy-grown magnetic oxides into III–V semiconductor devices.
    Original languageUndefined
    Pages (from-to)034507
    Number of pages4
    JournalJournal of Applied Physics
    Volume108
    Issue number3
    DOIs
    Publication statusPublished - 2010

    Keywords

    • EWI-19588
    • IR-75982
    • METIS-277537

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