Strong temperature dependence of magnetoresistance in Co-C granular thin films

Ruihe Tang, Masaki Mizuguchi, Hai Wang, Ronghai Yu, Koki Takanashi

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Co-C granular thin films with a Co content of 6.4 at.% were deposited at room temperature by co-sputtering. The magnetotransport properties of the thin films were investigated within 2300 K under magnetic fields up to 90 kOe. A large negative magnetoresistance (MR) of 27.6% was successfully observed at 2 K. As temperature (T) increased, negative MR decreased drastically. Meanwhile, positive MR with an organic MR (OMAR)-like shape emerged in a low magnetic field region. Ordinary MR (OMR) appeared in a high magnetic field region and can be verified by ?MR ∝ H2 fitting. When T reached 10 K, MR became completely positive. The MR effect showed strong temperature dependence. The interesting phenomena may help us gain a new insight into the spin-dependent transport in ferromagnetic metal (FM)/amorphous-carbon (α-C) system.

Original languageEnglish
Article number5467514
Pages (from-to)2144-2147
Number of pages4
JournalIEEE Transactions on Magnetics
Issue number6
Publication statusPublished - 2010 Jun


  • Magnetic granular thin film
  • Temperature dependence of magnetoresistance
  • Transport mechanism

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering


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