Abstract
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 language | English |
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Article number | 5467514 |
Pages (from-to) | 2144-2147 |
Number of pages | 4 |
Journal | IEEE Transactions on Magnetics |
Volume | 46 |
Issue number | 6 |
DOIs | |
Publication status | Published - 2010 Jun |
Keywords
- Magnetic granular thin film
- Temperature dependence of magnetoresistance
- Transport mechanism
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Electrical and Electronic Engineering