Metal-insulator transition and novel magnetoresistance effects in amorphous carbon films

被引：14
作者：
Liu, Zhichao [1 ]
Zhen, Congmian [1 ]
Wang, Peiyu [1 ]
Wu, Chunfang [1 ]
Ma, Li [1 ]
Hou, Denglu [1 ]
机构：
[1] Hebei Normal Univ, Inst Phys, Hebei Adv Thin Films Lab, Shijiazhuang 050024, Hebei, Peoples R China
来源：
CARBON | 2019年 / 148卷
基金：
中国国家自然科学基金;
关键词：
MAGNETOTRANSPORT;
D O I：
10.1016/j.carbon.2019.04.027
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Amorphous carbon films were successfully prepared by radio frequency magnetron sputtering at different deposition temperatures. We observed metal-insulator transition in the amorphous carbon films, and found that the metal-insulator transition temperature moved to low temperature with the increase of the deposition temperature. A local sandwich structure formed by sp(2) and sp(3) hybridized carbon domains was thought to exist in the amorphous carbon films, which is responsible for the negative giant magnetoresistance of the film. Ferromagnetism and antiferromagnetism coexist in the localized sandwich structure, and they are tuned by temperature and external magnetic field, resulting in a small bulge and signal reversal of the magnetoresistance of the film. The proportion of sp(2) and sp(3) hybridized carbon in the carbon films can be adjusted by temperature. Different bonding configurations of sp(2) and sp(3) hybridized carbon result in two kinds of unpaired electrons, thus exhibiting two ferromagnetic phases. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码：512 / 517
页数：6
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