Signature of Coherent Transport in Epitaxial Spinel-based Magnetic   Tunnel Junctions Probed by Shot Noise Measurement
  We measured the shot noise in fully epitaxial Fe/MgAl2OX/Fe-based magnetic tunneling junctions (MTJs). While the Fano factor to characterize the shot noise is very close to unity in the antiparallel configuration, it is reduced to 0.98 in the parallel configuration. This observation shows the sub-Poissonian process of electron tunneling in the parallel configuration, indicating the coherent tunneling through the spinel-based tunneling barrier of the MTJ. 
Takahiro Tanaka, Tomonori Arakawa, Kensaku Chida, Yoshitaka Nishihara,   Daichi Chiba, Kensuke Kobayashi, Teruo Ono, Hiroaki...
cond-mat.mes-hall quant-ph