Tunneling magnetoresistance with positive and negative sign in La0.67Sr0.33MnO3/SrTiO3/Co junctions

I.J. Vera Marun, F.M. Postma, J.C. Lodder, R. Jansen

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    Abstract

    We have investigated the effects of modification of the SrTiO3 /Co interface as well as the SrTiO3 barrier on the tunnel magnetoresistance TMR of La0.67Sr0.33MnO3 /SrTiO3 /Co junctions. Modification was realized by the introduction of one atomic layer of either TiO2 or SrO at the SrTiO3 /Co interface. Barriers with different oxygen content were also studied. In these structures we have observed positive as well as negative TMR, with a trend towards positive TMR for junctions with interfacial SrO and/or more oxygen-deficient barriers. This work offers more insight into the SrTiO3 /Co tunnel spin polarization and its sign.
    Original languageUndefined
    Article number10.1103/PhysRevB.76.064426
    Pages (from-to)064426
    Number of pages5
    JournalPhysical review B: Condensed matter and materials physics
    Volume76
    Issue number6
    DOIs
    Publication statusPublished - 23 Aug 2007

    Keywords

    • METIS-247031
    • IR-61960
    • EWI-11219

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