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Fabrication of Fully Epitaxial Co 2Cr0.6 Fe0.4Al/MgO/Co2Cr 0.6Fe0.4 Al Magnetic Tunnel Junctions

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6 Author(s)
Marukame, T. ; Graduate Sch. of Inf. Sci. & Technol., Hokkaido Univ., Sapporo ; Ishikawa, T. ; Hakamata, S. ; Matsuda, K.-I.
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Fully epitaxial magnetic tunnel junctions (MTJs) of Co2Cr0.6Fe0.4Al (CCFA)/MgO/CCFA with exchange biasing were fabricated. The fabricated MTJs showed clear exchange-biased tunnel magnetoresistance (TMR) characteristics due to the CCFA/Ru/Co90Fe10/IrMn exchange-biased synthetic ferrimagnetic layer. The TMR characteristics were investigated as a function of in situ annealing temperature (Ta) for the upper CCFA layer. We obtained TMR ratios of 60% at room temperature (RT) and 238% at 4.2 K for MTJs with Ta of 400 degC, while those for MTJs with Ta of RT (i.e., having an as-deposited upper CCFA layer) were 17% at RT and 80% at 4.2 K. These results clearly suggest that the spin polarization of the as-deposited upper CCFA layer was significantly increased by in situ annealing

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Magnetics, IEEE Transactions on  (Volume:43 ,  Issue: 6 )