Shot noise in magnetic tunnel junctions from first principles
Kai Liu, Ke Xia, Gerrit E. W. Bauer
TL;DR
This paper calculates shot noise in Fe/MgO/Fe tunnel junctions using first-principles methods, revealing how magnetic configuration and barrier thickness influence noise suppression, with results aligning well with experimental data.
Contribution
It provides a first-principles analysis of shot noise in magnetic tunnel junctions, highlighting the effects of barrier thickness and interface disorder on noise suppression.
Findings
Shot noise suppression varies with magnetic configuration.
Thicker barriers show threshold bias for resonant tunneling.
Results agree with recent experimental observations.
Abstract
We compute the shot noise in ballistic and disordered Fe/MgO/Fe tunnel junctions by a wave function-matching method. For tunnel barriers with no more than 5 atomic layers we find a suppression of the Fano factor as a function of the magnetic configuration. For thicker MgO barriers the shot noise is suppressed up to a threshold bias indicating the onset of resonant tunneling. We find excellent agreement with recent experiments when interface disorder is taken into account
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