Abstract
We report a positive spin valve effect—low resistance for parallel electrodes configuration—in organic spin valves fabricated by vacuum thermal evaporation using half-metal perovskite manganites La0.67Sr0.33MnO3 as the bottom electrode, cobalt as the top electrode, and tris(8-hydroxyquinoline) aluminum (Alq3) as the organic semiconductor spacer. A positive giant magnetoresistance (GMR) of ∼12% has been observed at 100 K. The origination mechanism of negative and positive GMR in organic spin valves has been discussed in detail.
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