Patent ID: 7572645
Filing Date: 2009-08-11
Classification: B82Y,G01R,G11C,H01F,H01L

Abstract:
1. A magnetic tunnel junction (MTJ), comprising: a pinned ferromagnetic (FM) layer; a tunneling dielectric layer on the pinned FM layer; a first free FM layer having higher first spin polarization and a first magnetostriction, on the tunneling dielectric; a non-FM coupling layer over the first free FM layer; and a second free FM layer spaced apart from the first free FM layer at least by the coupling layer, and having a lower second spin polarization and a second magnetostriction different than the first magnetostriction and adapted to compensate the first magnetostriction so that a net magnetostriction of the first and second free FM layers has a magnitude less than the magnitude of first magnetostriction.