Nearly total spin polarization in La[sub 2/3]Sr[sub 1/3]MnO[sub 3] from tunneling experiments

Bowen, M.; Bibes, M.; Barthélémy, A.; Contour, J.-P.; Anane, A.; Lemaı⁁tre, Y.; Fert, A.
January 2003
Applied Physics Letters;1/13/2003, Vol. 82 Issue 2, p233
Academic Journal
We have performed magnetotransport measurements on La[sub 2/3]Sr[sub 1/3]MnO[sub 3]/SrTiO[sub 3]/La[sub 2/3]Sr[sub 1/3]MnO[sub 3] magnetic tunnel junctions. A magnetoresistance ratio of more than 1800% is obtained at 4 K, 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 their capability as a spin analyzer. The magnetoresistance extends up to temperatures of more than 270 K. We argue that these improvements over most previous works may result from optimizing the patterning process for oxide heterostructures.


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