Magnetotransport in arrays of monodisperse magnetite nanoparticles has been studied as a function of annealing temperatures. Charge transport mechanisms change from thermally assisted interparticle tunneling to hopping between Fe-sites within the particle as the interparticle spacing is decreased. Despite this difference, magnetoresistance (MR) as a function of field shows a ubiquitous behavior dominated by non-collinear surface spins. All MR as a function of field can be fitted accurately by a Langevin-like function.
@article{arxiv.2110.04812,
title = {Magnetotransport in Fe3O4 nanoparticle arrays dominated by non-collinear surface spins},
author = {Seongjin Jang and Wenjie Kong and Hao Zeng},
journal= {arXiv preprint arXiv:2110.04812},
year = {2021}
}