Room temperature spin filtering in epitaxial cobalt-ferrite tunnel barriers

Details Room temperature spin filtering in epitaxial cobalt-ferrite tunnel barriers Room temperature spin filtering in epitaxial cobalt-ferrite tunnel barriers

2007-07-26

arxiv.org/abs/0707.3823v2

Physics

Condensed Matter

Materials Science

6 pages, 3 figures

Scientific paper

10.1063/1.2787880

We report direct experimental evidence of room temperature spin filtering in magnetic tunnel junctions (MTJs) containing CoFe2O4 tunnel barriers via tunneling magnetoresistance (TMR) measurements. Pt(111)/CoFe2O4(111)/gamma-Al2O3(111)/Co(0001) fully epitaxial MTJs were grown in order to obtain a high quality system, capable of functioning at room temperature. Spin polarized transport measurements reveal significant TMR values of -18% at 2 K and -3% at 290 K. In addition, the TMR ratio follows a unique bias voltage dependence that has been theoretically predicted to be the signature of spin filtering in MTJs containing magnetic barriers. CoFe2O4 tunnel barriers therefore provide a model system to investigate spin filtering in a wide range of temperatures.

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