Self-magnetism induced large magnetoresistance at room temperature region in graphene nanocrystallited carbon filmViews [2626] Delivery time :2016-11-08 08:50:03

Self-magnetism induced large magnetoresistance at room temperature
region in graphene nanocrystallited carbon film

Chao Wang and Dongfeng Diao*

DOI-Information: 10.1016/j.carbon.2016.11.009
https://authors.elsevier.com/a/1U1tf1zUA6SqY

Institute of Nanosurface Science and Engineering, Shenzhen University,
Shenzhen 518060, China

Abstract:
We report large positive magnetoresistance (MR) of over 12% at 273 K in graphene
nanocrystallited pure carbon film. MR behaviors at different temperatures implied that low
temperature MR was from carrier diffusive scattering and room temperature MR was from
spin arrangement effect. Temperature dependences of the film resistance and magnetization
recognized that as temperature decreased from 300 to 200 K, transitions occurred on the
electrical transporting process from conductive mode to semi-conductive mode, and the
nanocrystallited structure showed competition of ferromagnetic and antiferromagnetic
interactions. The large room temperature MR was ascribed to the ferromagnetic order of spin
magnetic moment arrangement at the of graphene layer edges.