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.
@article{arxiv.cond-mat/0202464,
title = {Enhanced Granular Magnetoresistance due to Ferromagnetic Layers},
author = {J. Balogh and M. Csontos and D. Kaptas and G. Mihaly},
journal= {arXiv preprint arXiv:cond-mat/0202464},
year = {2009}
}
Comments
4 pages, 3 figures, submitted to Applied Physics Letters