Sub-Poissonian shot noise in CoFeB/MgO/CoFeB-based magnetic tunneling junctions
arXiv:1108.4831 · doi:10.1063/1.3590921
Abstract
We measured the shot noise in the CoFeB/MgO/CoFeB-based magnetic tunneling junctions with a high tunneling magnetoresistance ratio (over 200% at 3 K). Although the Fano factor in the anti-parallel configuration is close to unity, it is observed to be typically 0.91\pm0.01 in the parallel configuration. It indicates the sub-Poissonian process of the electron tunneling in the parallel configuration due to the relevance of the spin-dependent coherent transport in the low bias regime.
3 pages, 3 figures
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