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A spin-tunnel-junction based on manganites, with La$_{1-x}$Sr$_x$MnO$_3$(LSMO) as ferromagnetic metallic electrodes and the undoped parent compoundLaMnO$_3$ (LMO) as insulating barrier, is here theoretically discussed usingdouble exchange model Hamiltonians and numerical techniques. For an even numberof LMO layers, the ground state is shown to have anti-parallel LSMO magneticmoments. This highly resistive, but fragile, state is easily destabilized bysmall magnetic fields, which orient the LSMO moments in the direction of thefield. The magnetoresistance associated with this transition is very large,according to Monte Carlo and Density Matrix Renormalization Group studies. Theinfluence of temperature, the case of an odd number of LMO layers, and thedifferences between LMO and SrTiO$_3$ as barriers are also addressed. Generaltrends are discussed.

Large Magnetoresistance in a Manganite Spin-Tunnel-Junction Using LaMnO3 as Insulating Barrier