Giant negative magnetoresistance in Manganese-substituted Zinc Oxide

Scientific Reports
X L WangA Ruotolo

Abstract

We report a large negative magnetoresistance in Manganese-substituted Zinc Oxide thin films. This anomalous effect was found to appear in oxygen-deficient films and to increase with the concentration of Manganese. By combining magnetoresistive measurements with magneto-photoluminescence, we demonstrate that the effect can be explained as the result of a magnetically induced transition from hopping to band conduction where the activation energy is caused by the sp-d exchange interaction.

References

Jan 18, 2005·Nature Materials·J M D CoeyC B Fitzgerald

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