Effect of Spin-Flip Scattering on Electrical Transport in Magnetic Tunnel Junctions
نویسندگان
چکیده
By means of the nonequilibrium Green function technique, the effect of spin-flip scatterings on the spin-dependent electrical transport in ferromagnetinsulator-ferromagnet (FM-I-FM) tunnel junctions is investigated. It is shown that Jullières formula for the tunnel conductance must be modified when including the contribution from the spin-flip scatterings. It is found that the spin-flip scatterings could lead to an angular shift of the tunnel conductance, giving rise to the junction resistance not being the largest when the orientations of magnetizations in the two FM electrodes are antiparallel, which may offer an alternative explanation for such a phenomenon observed previously in experiments in some FM-I-FM junctions. The spin-flip assisted tunneling is also observed. PACS numbers: 73.40.Gk, 73.40.Rw, 75.70.Cn Typeset using REVTEX
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