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

Published online by Cambridge University Press:  29 August 2012

J.G Kang ,
M. Mizuguchi  and
K. Takanashi
J.G Kang*
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
M. Mizuguchi
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
K. Takanashi
Affiliation:
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan
*
*email: jgkang@imr.tohoku.ac.jp
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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.

Keywords

magnetoresistance (transport)sputteringC
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1458: Symposium LL – New Trends and Developments in Nanomagnetism , 2012 , mrss12-1458-ll04-05
Copyright
Copyright © Materials Research Society 2012

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