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We report on room temperature low frequency noise due to magneticinhomogeneities/domain walls (MI/DWs) in elliptic submicron FeCoB/MgO/FeCoBmagnetic tunnel junctions with an area between 0.0245 and 0.0675{\mu}m2. In thesmaller area junctions we found an unexpected random telegraph noise (RTN1),deeply in the parallel state, possibly due to stray field induced MI/DWs in thehard layer. The second noise source (RTN2) is observed in the antiparallelstate for the largest junctions. Strong asymmetry of RTN2 and of relatedresistance steps with current indicate spin torque acting on the MI/DWs in thesoft layer at current densities below 5x10^5 A/cm2.

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