Abstract

Electrodeposition of cobalt on monolayer graphene synthesized by chemical vapor deposition produces Co–CoO/graphene composite structures, which is accompanied by increases in the electrical resistance and magnetoresistance. We show that the observed magnetoresistance effect is caused by two competing contributions: negative (NMR) and positive (PMR) magnetoresistance. In weak magnetic fields, the NMR is described by quantum localization correction to the Drude model of conductivity in graphene. The enhancement of PMR observed in strong magnetic fields is related to the Lorentz mechanism in Co–CoO particles.

中文翻译：

---

磁性Co-CoO颗粒对单层石墨烯载流子传输的影响

摘要

通过化学气相沉积法在单层石墨烯上进行钴的电沉积会生成Co–CoO /石墨烯复合结构，并伴随电阻和磁阻的增加。我们表明，观察到的磁阻效应是由两个竞争性贡献引起的：负（NMR）和正（PMR）磁阻。在弱磁场中，通过对石墨烯中电导率的Drude模型进行量子定位校正来描述NMR。在强磁场中观察到的PMR增强与Co-CoO颗粒中的洛伦兹机理有关。