Indications of spin polarized transport in Ba2FeMoO6 thin films
Abstract
We have investigated the magnetic and magnetotransport properties of Ba2FeMoO6 thin films produced by pulsed laser deposition from optimized bulk material. The films are comprised of grains of crystalline Ba2FeMoO6 with a disordered grain boundary region that lowers the net saturation magnetization of the film and prevents full magnetic alignment below a Curie temperature TC305 K. Magnetotransport measurements point to the Ba2FeMoO6 grains retaining the high spin polarization of a half-metal up to TC, while the grain boundaries greatly reduce the spin polarization of the intergrain electrical current due to spin-flip scattering. Our results show that a strong spin polarization of the electronic charge carriers is present even in Ba2FeMoO6 films that do not show the ideal bulk magnetic character.
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