Giant Coulomb blockade magnetoresistance in magnetic tunnel junctions with a granular layer

X. G. Zhang, Z. C. Wen, H. X. Wei, X. F. Han

    Research output: Contribution to journalArticlepeer-review

    17 Citations (Scopus)

    Abstract

    We show that the Coulomb blockade voltage can be made to depend strongly on the electron spin in a discontinuous magnetic granular layer inserted in the middle of an insulating layer of a tunnel junction. This strong spin dependence is predicted from the local intergranular magnetoresistance effects, including giant magnetoresistance (GMR), tunneling magnetoresistance, colossal magnetoresistance, or GMR through a polymer spacer. The resulting Coulomb blockade magnetoresistance (CBMR) ratio can exceed the magnetoresistance ratio of the granular layer itself by orders of magnitude. Unlike other magnetoresistance effects, the CBMR effect does not require magnetic electrodes.

    Original languageEnglish
    Article number155122
    JournalPhysical Review B - Condensed Matter and Materials Physics
    Volume81
    Issue number15
    DOIs
    Publication statusPublished - 2010 Apr 26

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

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