摘要
采用磁控共溅射方法在n型Si(100)基片上制备了一系列具有不同Co含量(x,at%)的Co掺杂非晶C颗粒薄膜,溅射温度为室温。研究了Co-C颗粒薄膜的微结构,磁输运特性及磁性能。通过优化Co含量,在低温下发现了较大的负磁电阻(MR)。温度为2K、磁场为90×79.6kA.m-1时,Co含量为6.4at%的Co-C薄膜的负磁电阻值最大,达到27.6%。随着Co含量从6.4at%增加至16.4at%,MR值从27.6%逐渐减小至2.2%。电阻率??随温度T的变化曲线显示了线性的ln?-T-1/2关系,说明样品中电子传导遵循隧穿输运机制。
A series of Co-doped amorphous carbon granular thin films with various Co contents(x,at%) were deposited on n-type Si(100) substrates by a magnetron co-sputtering technique at room temperature.The microstructure,magnetotransport and magnetic properties of the Co-C films have been characterized.By optimizing Co content,giant negative magnetoresistances(MRs) were observed at low temperature,with a maximum MR ratio of 27.6% at 2 K under an applied magnetic field of 90×79.6 kA.m-1 for the film with Co content of 6.4 at%.As Co content increases from 6.4 at% to 16.4 at%,the MR ratio decreases gradually from 27.6% to 2.2%.A linear ln?-T-1/2 relationship indicates that the spin transport in Co6.4C93.6 thin film agrees well with tunneling conductance.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2012年第11期1887-1890,共4页
Rare Metal Materials and Engineering
基金
National Natural Science Foundation of China(51041010)
The Ph.D.Programs Foundation of Ministry of Education of China(20090002110007)
the National Basic Research Program of China(2010CB934602)
关键词
Co掺杂非晶C薄膜
磁控共溅射
磁输运
磁性能
Co-doped amorphous carbon films
magnetron co-sputtering
magnetotransport
magnetic properties