Signature of Coherent Transport in Epitaxial Spinel-based Magnetic Tunnel Junctions Probed by Shot Noise Measurement
Takahiro Tanaka, Tomonori Arakawa, Kensaku Chida, Yoshitaka Nishihara,, Daichi Chiba, Kensuke Kobayashi, Teruo Ono, Hiroaki Sukegawa, Shinya Kasai,, and Seiji Mitani
TL;DR
This study investigates shot noise in epitaxial Fe/MgAl2OX/Fe magnetic tunnel junctions, revealing evidence of coherent electron tunneling through the spinel barrier, especially in the parallel magnetic configuration.
Contribution
It provides experimental evidence of coherent tunneling in epitaxial spinel-based magnetic tunnel junctions using shot noise measurements.
Findings
Fano factor close to 1 in antiparallel configuration
Fano factor reduced to 0.98 in parallel configuration
Evidence of sub-Poissonian, coherent tunneling
Abstract
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.
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