Enhanced Granular Magnetoresistance due to Ferromagnetic Layers
arXiv:cond-mat/0202464 · doi:10.1016/S0038-1098(03)00214-X
Abstract
Giant magnetoresistance (GMR) of sequentially evaporated Fe-Ag structures have been investigated. Direct experimental evidence is given that inserting ferromagnetic layers into a granular structure significantly enhances the magnetoresistance. The increase of the GMR effect is attributed to spin polarization effects. The large enhancement (up to more than a fourfold value) and the linear variation of the GMR in low magnetic fields are explained by scattering of the spin polarized conduction electrons on paramagnetic grains.
4 pages, 3 figures, submitted to Applied Physics Letters