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

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arxiv cond-mat/0211158 v1 pith:JGCJERX5 submitted 2002-11-08 cond-mat.mtrl-sci cond-mat.str-el

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

M. Bowen , M. Bibes , A. Barthelemy , J.-P. Contour , A. Anane , Y. Lemaitre , A. Fert This is my paper
classification cond-mat.mtrl-sci cond-mat.str-el
keywords mno3spinmagnetoresistancepolarizationresultanalyzerarguecapability
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We have performed magnetotransport measurements on La2/3Sr1/3MnO3 / SrTiO3 / La2/3Sr1/3MnO3 magnetic tunnel junctions. A magnetoresistance ratio of more than 1800 % is obtained at 4K, from which we infer an electrode spin polarization of at least 95 %. This result strongly underscores the half-metallic nature of mixed-valence manganites and demonstrates its capability as a spin analyzer. The magnetoresistance extends up to temperatures of more than 270K. We argue that these improvements over most previous works may result from optimizing the patterning process for oxide heterostructures.

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