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We have performed magnetotransport measurements on La2/3Sr1/3MnO3 / SrTiO3 /La2/3Sr1/3MnO3 magnetic tunnel junctions. A magnetoresistance ratio of morethan 1800 % is obtained at 4K, from which we infer an electrode spinpolarization of at least 95 %. This result strongly underscores thehalf-metallic nature of mixed-valence manganites and demonstrates itscapability as a spin analyzer. The magnetoresistance extends up to temperaturesof more than 270K. We argue that these improvements over most previous worksmay result from optimizing the patterning process for oxide heterostructures.Comment: to appear in Applied Physics Letter

Nearly total spin polarization in La2/3Sr1/3MnO3 from tunneling experiments