Giant tunneling magnetoresistance with electron beam evaporated MgO barrier and CoFeB electrodes

H. Kurt, K. Oguz, T. Niizeki, J. M.D. Coey

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    22 Citations (Scopus)

    Abstract

    Electron-beam (EB) evaporated MgO grows with (001) texture on amorphous CoFeB when the deposition rate is kept below 5 pm/s. Magnetic tunnel junctions (MTJs) fabricated using this method exhibit ∼240% magnetoresistance at room temperature for a 2.5 nm thick EB-MgO barrier, which is similar to the value for a radio frequency (rf) sputtered barrier with the same junction geometry. The average barrier height of the EB-MgO is 0.48 eV, which is higher than previously reported values for rf-MgO barriers and it increases with increasing annealing temperature. Our results show that EB-MgO could be a simpler alternative to rf-MgO in MTJs without any compromise in the tunnelling magnetoresistance.

    Original languageEnglish
    Article number083920
    JournalJournal of Applied Physics
    Volume107
    Issue number8
    DOIs
    Publication statusPublished - 2010 Apr 15

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

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