Shot Noise in Magnetic Tunnel Junctions: Evidence for Sequential Tunneling

Details Shot Noise in Magnetic Tunnel Junctions: Evidence for Sequential Tunneling Shot Noise in Magnetic Tunnel Junctions: Evidence for Sequential Tunneling

2006-02-20

arxiv.org/abs/cond-mat/0602467v3

Phys. Rev. Lett. 97 (2006) 266602

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures

Scientific paper

We report the experimental observation of sub-Poissonian shot noise in single magnetic tunnel junctions, indicating the importance of tunneling via impurity levels inside the tunnel barrier. For junctions with weak zero-bias anomaly in conductance, the Fano factor (normalized shot noise) depends on the magnetic configuration being enhanced for antiparallel alignment of the ferromagnetic electrodes. We propose a model of sequential tunneling through nonmagnetic and paramagnetic impurity levels inside the tunnel barrier to qualitatively explain the observations.

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