Comparative study on magnetoresistance of carbon-cobalt nanocomposite thin films grown by pulsed laser deposition

TL;DR

This study investigates how magnetic fields affect the resistance of carbon-cobalt nanocomposite thin films across different temperatures, revealing a transition from positive to negative magnetoresistance influenced by weak localization and ferromagnetic scattering.

Contribution

It provides a comparative analysis of magnetoresistance behavior in carbon-cobalt nanocomposite thin films grown by pulsed laser deposition, highlighting temperature-dependent mechanisms.

Findings

At low temperatures, MR is positive due to weak localization.

At high temperatures, MR becomes negative due to electron scattering on cobalt.

Magnetoresistance behavior depends critically on temperature.

Abstract

We present a comparative study on the influence of applied magnetic field on the resistance of $C_{1-x}Co_x$ thin films (with $x=0.1$, $0.15$ and $0.2$) grown on $Si$ substrate by pulsed laser deposition technique. It is found that the behavior of magnetoresistance (MR) drastically depends on the temperature. Namely, at low temperatures MR is positive and its behavior is governed by the field mediated weak localization scenario. While at high temperatures MR turns negative and its behavior is dominated by electron scattering on ferromagnetic cobalt atoms.