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

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

doi:10.1109/TMAG.2010.2043340

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 journal › Article › peer-review

7 Citations (Scopus)

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
Article number	5467514
Pages (from-to)	2144-2147
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	46
Issue number	6
DOIs	https://doi.org/10.1109/TMAG.2010.2043340
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

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title = "Strong temperature dependence of magnetoresistance in Co-C granular thin films",

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.",

keywords = "Magnetic granular thin film, Temperature dependence of magnetoresistance, Transport mechanism",

author = "Ruihe Tang and Masaki Mizuguchi and Hai Wang and Ronghai Yu and Koki Takanashi",

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T1 - Strong temperature dependence of magnetoresistance in Co-C granular thin films

AU - Tang, Ruihe

AU - Mizuguchi, Masaki

AU - Wang, Hai

AU - Yu, Ronghai

AU - Takanashi, Koki

PY - 2010/6

Y1 - 2010/6

N2 - 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.

AB - 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.

KW - Magnetic granular thin film

KW - Temperature dependence of magnetoresistance

KW - Transport mechanism

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

Abstract

Keywords

ASJC Scopus subject areas

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