Room temperature spin filtering in epitaxial cobalt-ferrite tunnel barriers
By A. Ramos, M. Guittet, J. Moussy, R. Mattana, C. Deranlot, F. Petroff, C. Gatel. 2007
178 citations recorded by the source corpus.
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.
Subfields: Atomic and Molecular Physics, and Optics, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/74b6a2f9407f0be9be8ff8671c16550852e812da
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In Atomic and Molecular Physics, and Optics
In Materials Chemistry
Citations in the corpus
- Roadmap for Emerging Materials for Spintronic Device Applications (2015, unknown): “47 × 106 J/m3 in CoFe2O4 ferrite [25] has been reported.”
- Nobel Lecture: Origin, development, and future of spintronics (2008, background): “Another interesting concept that we are exploring is spin filtering by tunneling through a ferromagnetic insulator layer Leclair et al., 2002; Ramos et al., 2007 .”