Enhanced Spin Dependent Shot Noise in Magnetic Tunnel Barriers
S. Garzon (1), Y. Chen (2), R. A. Webb (1) ((1) Department of Physics, and Astronomy, USC Nanocenter, University of South Carolina, (2), Department of Physics, Astronomy, University of Pennsylvania)
TL;DR
This paper reports the observation of increased spin-dependent shot noise in magnetic tunnel barriers, indicating transport via localized states, supported by negative magnetoresistance and conductance features, explained through a model of tunneling with localized states.
Contribution
It introduces a simple model of tunneling through two interacting localized states with spin-dependent rates to explain enhanced shot noise in magnetic tunnel barriers.
Findings
Enhanced spin-dependent shot noise observed
Transport occurs through localized states within the barrier
Negative magnetoresistance and conductance structures support the findings
Abstract
We report the observation of enhanced spin dependent shot noise in magnetic tunnel barriers, suggesting transport through localized states within the barrier. This is supported by the existence of negative magnetoresistance and structure in the differential conductance curves. A simple model of tunneling through two interacting localized states with spin dependent tunneling rates is used to explain our observations.
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