Low-temperature magnetotransport and magnetic properties of cobalt-doped amorphous carbon thin films

Ruihe Tang, Wei Liu, Zhengjun Zhang, Ronghai Yu, Xiaofang Liu, Bai Yang, Mizuguchi Masaki, Takanashi Koki

Research output: Contribution to journalArticlepeer-review

Abstract

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 lnρ-T-1/2 relationship indicates that the spin transport in Co6.4C93.6 thin film agrees well with tunneling conductance.

Original languageEnglish
Pages (from-to)1887-1890
Number of pages4
JournalXiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering
Volume41
Issue number11
Publication statusPublished - 2012 Nov

Keywords

  • Co-doped amorphous carbon films
  • Magnetic properties
  • Magnetotransport
  • Magnetron co-sputtering

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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