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

By M. Bowen, Manuel Bibes, A. Barthélémy, J. Contour, A. Anane, Y. Lemaître, Albert Fert. 2002

664 citations recorded by the source corpus.

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 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.

Subfields: Electronic, Optical and Magnetic Materials, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/88c05f0436d4885ffe239ef19072d6e3b791f6f5

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In Electronic, Optical and Magnetic Materials

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Citations in the corpus

The emergence of spin electronics in data storage. (2007, background): “This could be achieved by replacing metallic ferromagnetic layers with 100% spin-polarized conductors such as half-metallic oxide”
Oxide Spintronics (2007, methodology): “measurements corresponding to spin polarizations exceeding this value were measured [34].”
Roadmap for Emerging Materials for Spintronic Device Applications (2015, background): “Sr2FeMoO6 (SFMO) has high TC of 420 K and has been predicted to be a half-metal [33], indicating the double perovskites are a promising oxide family for high MR at RT.”
Tunnel junctions with multiferroic barriers. (2007, methodology): “The LSMO layer can be used as a bottom metallic electrode for ferroelectric characterization and as a half-metallic ferromagnetic electrod”
Electrical Detection of Magnetization Dynamics via Spin Rectification Effects (2016, neutral): “One way to increase the polarization of the electrode would be to use half-metallic ferromagnetic materials which act as metals for one spin direction and insulators for the other, and therefore theoretically have polarizations of 100% [125, 126].”
Nobel Lecture: Origin, development, and future of spintronics (2008, methodology): “Very high spin polarization 95% and record TMR 1800% have been obtained by our Ph.D. student Martin Bowen with La2/3Sr1/3MnO3 electrodes Bowen et al., 2003 but Rev. Mod.”