Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 24, Pages 5182-5185Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.5182
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We have made Meservey-Tedrow style spin-polarized tunneling measurements on SrRuO3, using a SrTiO3 barrier. In contrast to all other materials measured with this technique, we found the spin polarization to be negative, P = -9.5%. This makes it possible to test the generalized Julliere model for a negatively spin-polarized electrode, by measuring the magnetoresistance of a La0.7Sr0.3MnO3/SrTiO3/SrRuO3 tunnel junction. The generalized Julliere theory predicts it should be inverse.
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