The magneto-transport properties of nanocomposite C:Co (15 and 40 at.% Co) thin films are investigated. The films were grown by ion beam co-sputtering on thermally oxidized silicon substrates in the temperature range from 200 to 500 degC. Two major effects are reported: (i) a large anomalous Hall effect amounting to 2 \mu ohm cm, and (ii) a negative magnetoresistance. Both the field-dependent resistivity and Hall resistivity curves coincide with the rescaled magnetization curves, a finding that is consistent with spin-dependent transport. These findings suggest that C:Co nanocomposites are promising candidates for carbon-based Hall sensors and spintronic devices.
@article{arxiv.0908.0127,
title = {Spin-dependent transport in nanocomposite C:Co films},
author = {Shengqiang Zhou and Markus Berndt and Danilo Buerger and Viton Heera and Kay Potzger and Gintautas Abrasonis and Gyoergy Radnoczi and Gyoergy J. Kovacs and Andreas Kolitsch and Manfred Helm and Juergen Fassbender and Wolfhard Moeller and Heidemarie Schmidt},
journal= {arXiv preprint arXiv:0908.0127},
year = {2009}
}