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Low frequency noise due to magnetic inhomogeneities in submicron FeCoB/MgO/FeCoB magnetic tunnel junctions

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arxiv 1204.3744 v1 pith:ENHH6623 submitted 2012-04-17 cond-mat.mes-hall cond-mat.mtrl-sci

D.Herranz , A. Gomez-Ibarlucea , M. Schäfers , A. Lara , G. Reiss , F.G. Aliev This is my paper
classification cond-mat.mes-hallcond-mat.mtrl-sci
keywords fecobjunctionsmagneticnoiseareacurrentfrequencyinhomogeneities
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We report on room temperature low frequency noise due to magnetic inhomogeneities/domain walls (MI/DWs) in elliptic submicron FeCoB/MgO/FeCoB magnetic tunnel junctions with an area between 0.0245 and 0.0675{\mu}m2. In the smaller area junctions we found an unexpected random telegraph noise (RTN1), deeply in the parallel state, possibly due to stray field induced MI/DWs in the hard layer. The second noise source (RTN2) is observed in the antiparallel state for the largest junctions. Strong asymmetry of RTN2 and of related resistance steps with current indicate spin torque acting on the MI/DWs in the soft layer at current densities below 5x10^5 A/cm2.

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