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By use of first-principles electronic structure calculations, we predict thatthe magnetoresistance of the bcc Co(100)/MgO(100)/bcc Co(100) andFeCo(100)/MgO(100)/FeCo(100) tunneling junctions can be several times largerthan the very large magnetoresistance predicted for theFe(100)/MgO(100)/Fe(100) system. The origin of this large magnetoresistance canbe understood using simple physical arguments by considering the electrons atthe Fermi energy travelling perpendicular to the interfaces. For the minorityspins there is no state with $\Delta_1$ symmetry whereas for the majority spinsthere is only a $\Delta_1$ state. The $\Delta_1$ state decays much more slowlythan the other states within the MgO barrier. In the absence of scatteringwhich breaks the conservation of momentum parallel to the interfaces, theelectrons travelling perpendicular to the interfaces undergo total reflectionif the moments of the electrodes are anti-parallel. These arguments applyequally well to systems with other well ordered tunnel barriers and for whichthe most slowly decaying complex energy band in the barrier has $\Delta_1$symmetry. Examples include systems with (100) layers constructed from Fe, bccCo, or bcc FeCo electrodes and Ge, GaAs, or ZnSe barriers.Comment: 8 figure files in eps forma

physical review. b, condensed matter and materials physics

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Large magnetoresistance in bccCo∕MgO∕CoandFeCo<…