Abstract
We report on spin-dependent tunneling measurements in all-oxide spin valves in which mixed valence manganites La 0.7Sr 0.3MnO 3 electrodes are separated by a thin insulating layer. Information about the density of states and polarisation properties of LaSrMnO can be inferred from the variations of the differential conductance with applied voltage and magnetic field. Our measurements are consistent with the existence of a 1.5 eV wide e g band almost fully polarized at the Fermi level. High levels of spin polarisation lead to a large magnetoresistance at low fields and a high-field contribution is attributed to the presence of canted interfacial manganite phases. A low-field magnetoresistance ratio of 450% below 100 Oe was obtained on a sample with a SrTiO 3 barrier, indicating a spin polarisation value in excess of 0.83 for the manganite.
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