Band Structure and Density of States Effects in Co-Based Magnetic Tunnel Junctions

P. LeClair, J.T. Kohlhepp, C.H. van de Vin, H. Wieldraaijer, H.J.M. Swagten, W.J.M. de Jonge, A.H. Davis, J.M. MacLaren, J.S. Moodera, R. Jansen

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    Abstract

    Utilizing CoAl...O Co magnetic tunnel junctions with Co electrodes of different crystalline phases, a clear relationship between electrode crystal structure and junction transport properties is presented. For junctions with one fcc(111) textured and one polycrystalline (polyphase and polydirectional) Co electrode, a strong asymmetry is observed in the magnetotransport properties, while when both electrodes are polycrystalline the magnetotransport is essentially symmetric. These observations are successfully explained within a model based on ballistic tunneling between the calculated band structures (density of states) of fcc-Co and hcp-Co.
    Original languageUndefined
    Pages (from-to)107201-1
    Number of pages4
    JournalPhysical review letters
    Volume88
    Issue number10
    DOIs
    Publication statusPublished - 2002

    Keywords

    • EWI-5517
    • IR-44239
    • METIS-208690
    • SMI-NE: From 2006 in EWI-NE

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