Negative spin-polarization of SrRuO3
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 La(0.7)Sr(0. 3)MnO(3)/SrTiO(3)/SrRuO(3) tunnel junction. The generalized Julliere theory predicts it should be inverse.
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