Magnetoresistance properties of granular nanowires composed of carbon nanoparticles embedded in a Co matrix

J. E. Wegrowe; A. Sallin; A. Fábián; A. Comment; J. M. Bonard; J. Ansermet

doi:10.1103/PhysRevB.65.012407

Magnetoresistance properties of granular nanowires composed of carbon nanoparticles embedded in a Co matrix

J. E. Wegrowe
, A. Sallin
, A. Fábián
, A. Comment
, J. M. Bonard
, J. Ansermet

ENAC-IIC-GEL

Research output: Contribution to journal › Article › peer-review

Abstract

Spin-dependent transport was studied in granular nanowires composed of magnetic and nonmagnetic nanoparticles embedded in a Co matrix. At low temperature, giant magnetoresistance (GMR) and tunnelinglike magnetoresistance (TMR) appear. GMR and TMR-like magnetoresistance are identified by the temperature and bias voltage dependence of the resistivity and the temperature dependence of the magnetoresistance. Electron microscopy observations suggest also that the percolation threshold of the particles in the wire triggers the transition from diffusive to hopping transport. The magnetoresistance behavior is very similar for both Ohmic and non-Ohmic transport. The origin of the magnetoresistance is ascribed to the presence of constrained magnetic walls pinned between the nanoparticles.

Original language	English
Pages (from-to)	1-4
Number of pages	4
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	65
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevB.65.012407
Publication status	Published - 1 Jan 2002
Externally published	Yes

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10.1103/PhysRevB.65.012407

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abstract = "Spin-dependent transport was studied in granular nanowires composed of magnetic and nonmagnetic nanoparticles embedded in a Co matrix. At low temperature, giant magnetoresistance (GMR) and tunnelinglike magnetoresistance (TMR) appear. GMR and TMR-like magnetoresistance are identified by the temperature and bias voltage dependence of the resistivity and the temperature dependence of the magnetoresistance. Electron microscopy observations suggest also that the percolation threshold of the particles in the wire triggers the transition from diffusive to hopping transport. The magnetoresistance behavior is very similar for both Ohmic and non-Ohmic transport. The origin of the magnetoresistance is ascribed to the presence of constrained magnetic walls pinned between the nanoparticles.",

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AU - Wegrowe, J. E.

AU - Sallin, A.

AU - Fábián, A.

AU - Comment, A.

AU - Bonard, J. M.

AU - Ansermet, J.

PY - 2002/1/1

Y1 - 2002/1/1

N2 - Spin-dependent transport was studied in granular nanowires composed of magnetic and nonmagnetic nanoparticles embedded in a Co matrix. At low temperature, giant magnetoresistance (GMR) and tunnelinglike magnetoresistance (TMR) appear. GMR and TMR-like magnetoresistance are identified by the temperature and bias voltage dependence of the resistivity and the temperature dependence of the magnetoresistance. Electron microscopy observations suggest also that the percolation threshold of the particles in the wire triggers the transition from diffusive to hopping transport. The magnetoresistance behavior is very similar for both Ohmic and non-Ohmic transport. The origin of the magnetoresistance is ascribed to the presence of constrained magnetic walls pinned between the nanoparticles.

AB - Spin-dependent transport was studied in granular nanowires composed of magnetic and nonmagnetic nanoparticles embedded in a Co matrix. At low temperature, giant magnetoresistance (GMR) and tunnelinglike magnetoresistance (TMR) appear. GMR and TMR-like magnetoresistance are identified by the temperature and bias voltage dependence of the resistivity and the temperature dependence of the magnetoresistance. Electron microscopy observations suggest also that the percolation threshold of the particles in the wire triggers the transition from diffusive to hopping transport. The magnetoresistance behavior is very similar for both Ohmic and non-Ohmic transport. The origin of the magnetoresistance is ascribed to the presence of constrained magnetic walls pinned between the nanoparticles.

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JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 1

ER -

Magnetoresistance properties of granular nanowires composed of carbon nanoparticles embedded in a Co matrix

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