Spin-dependent transport in nanocomposite C:Co films

TL;DR

This study investigates the magneto-transport properties of C:Co nanocomposite films, revealing significant anomalous Hall effects and negative magnetoresistance, indicating potential for spintronic applications.

Contribution

It provides new insights into spin-dependent transport phenomena in C:Co nanocomposites grown at various temperatures, highlighting their suitability for sensor and spintronic device applications.

Findings

Large anomalous Hall effect observed (~2 μΩ·cm)

Negative magnetoresistance detected

Resistivity curves align with magnetization, indicating spin-dependent transport

Abstract

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.