Magnetotransport properties of Co-C granular thin films depending on the carbon sputtering power

J. G. Kang, Masaki Mizuguchi, Koki Takanashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

CoxC1-x granular films were deposited on Si substrates by a co-sputtering method. A large negative MR of 30.3% was obtained at 2 K for the sample prepared with the sputtering power of 50 W (C) and 4 W (Co). We have studied structural properties of Co-C granular films by Raman spectroscopy. Two peaks (D and G modes) from carbon bonds were clearly observed, and the intensity ratio of two peaks changed with the sputtering power, suggesting that the graphitization was promoted with the sputtering power. It was also revealed that the transport mechanism changed from tunneling to Mott's variable range hopping and MR decreased with the sputtering power.

Original languageEnglish
Title of host publicationNew Trends and Developments in Nanomagnetism
Pages1-6
Number of pages6
DOIs
Publication statusPublished - 2012 Dec 1
Event2012 MRS Spring Meeting - San Francisco, CA, United States
Duration: 2012 Apr 92012 Apr 13

Publication series

NameMaterials Research Society Symposium Proceedings
Volume1458
ISSN (Print)0272-9172

Other

Other2012 MRS Spring Meeting
CountryUnited States
CitySan Francisco, CA
Period12/4/912/4/13

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Kang, J. G., Mizuguchi, M., & Takanashi, K. (2012). Magnetotransport properties of Co-C granular thin films depending on the carbon sputtering power. In New Trends and Developments in Nanomagnetism (pp. 1-6). (Materials Research Society Symposium Proceedings; Vol. 1458). https://doi.org/10.1557/opl.2012.1467