Enhanced Granular Magnetoresistance due to Ferromagnetic Layers

Details Enhanced Granular Magnetoresistance due to Ferromagnetic Layers Enhanced Granular Magnetoresistance due to Ferromagnetic Layers

2002-02-26

arxiv.org/abs/cond-mat/0202464v1

Physics

Condensed Matter

Materials Science

4 pages, 3 figures, submitted to Applied Physics Letters

Scientific paper

10.1016/S0038-1098(03)00214-X

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.

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