Physics – Condensed Matter – Materials Science
Scientific paper
2011-11-28
Physics
Condensed Matter
Materials Science
Scientific paper
We investigate incoherent spin polarized tunnel transport regime in single crystal Co2FeAl/MgO/Co50Fe50 magnetic tunnel junctions (MTJ) with 4.2 nm thick MgO barriers grown by combined Molecular Beam Epitaxy and Sputtering deposition techniques. Tunnel transport spectroscopy experiments at variable temperature correlated with High Resolution Transmission Electron Microscopy phase analysis demonstrate the efect of the high density mis?t dislocations within the thick insulator on the longitudinal and lateral coherence of the propagating Bloch func- tions. These dislocations are extended defects within the barrier which destroy the symmetry and k conservation of the electron wave function across the stack a?ecting drastically the TMR ratio of the MTJs. The reduction of defects density within the barrier in fully sputtered MTJ devices leads to one order of magnitude increase of the TMR.
Petrisor T. Jr.
Gabor M. S.
Hehn Michel
Petrisor T.
Snoeck Etienne
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