Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-04-19
Phys. Rev. B 81, 165311 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
15 pages, 10 figures
Scientific paper
10.1103/PhysRevB.81.165311
We probe spin transport in Cu_{2}O by measuring spin valve effect in La_{0.7}Sr_{0.3}MnO_{3}/Cu_{2}O/Co and La_{0.7}Sr_{0.3}MnO_{3}/Cu_{2}O/La_{0.7}Sr_{0.3}MnO_{3} epitaxial heterostructures. In La_{0.7}Sr_{0.3}MnO_{3}/Cu_{2}O/Co systems we find that a fraction of out-of-equilibrium spin polarized carrier actually travel across the Cu_{2}O layer up to distances of almost 100 nm at low temperature. The corresponding spin diffusion length dspin is estimated around 40 nm. Furthermore, we find that the insertion of a SrTiO_{3} tunneling barrier does not improve spin injection, likely due to the matching of resistances at the interfaces. Our result on dspin may be likely improved, both in terms of Cu_{2}O crystalline quality and sub-micrometric morphology and in terms of device geometry, indicating that Cu_{2}O is a potential material for efficient spin transport in devices based on crystalline oxides.
Banerjee Narayan
Cantoni Matteo
Gadaleta A.
Marré Daniele
Pallecchi Ilaria
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