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Abstract: We report direct experimental evidence of room temperature spin filtering inmagnetic tunnel junctions MTJs containing CoFe2O4 tunnel barriers viatunneling magnetoresistance TMR measurements.Pt111-CoFe2O4111-gamma-Al2O3111-Co0001 fully epitaxial MTJs were grownin order to obtain a high quality system, capable of functioning at roomtemperature. Spin polarized transport measurements reveal significant TMRvalues of -18% at 2 K and -3% at 290 K. In addition, the TMR ratio follows aunique bias voltage dependence that has been theoretically predicted to be thesignature of spin filtering in MTJs containing magnetic barriers. CoFe2O4tunnel barriers therefore provide a model system to investigate spin filteringin a wide range of temperatures.



Autor: A. V. Ramos, M.-J. Guittet, J.-B. Moussy, R. Mattana, C. Deranlot, F. Petroff, C. Gatel

Fuente: https://arxiv.org/



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