Magnetic and transport properties of Co nanoparticles embedded in a carbon matrix

Co nanoparticles embedded in a carbon matrix have been prepared by gas condensation using a cluster gun. The magnetic, microstructural, and transport properties of the Co nanoparticles can be controlled by the volume fraction of Co particles, which is adjusted by the sputtering time of Co. With the...

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Bibliographic Details
Published in:Journal of applied physics 2005-05, Vol.97 (10), p.10J303-10J303-3
Main Authors: Liu, P., Huang, Y., Zhang, Y., Bonder, M. J., Hadjipanayis, G. C., Vlachos, D., Deshmukh, S. R.
Format: Article
Language:English
Subjects:
CARBON
CHANNELING
CHARGED-PARTICLE TRANSPORT
COBALT
COERCIVE FORCE
CRYSTAL STRUCTURE
DEPOSITION
FERROMAGNETIC MATERIALS
HYSTERESIS
MAGNETORESISTANCE
MATERIALS SCIENCE
MICROSTRUCTURE
NANOSTRUCTURES
PARTICLE SIZE
PARTICLES
SPUTTERING
SUPERPARAMAGNETISM
TEMPERATURE RANGE 0065-0273 K
THIN FILMS
TRANSMISSION ELECTRON MICROSCOPY
TUNNEL EFFECT
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Summary:Co nanoparticles embedded in a carbon matrix have been prepared by gas condensation using a cluster gun. The magnetic, microstructural, and transport properties of the Co nanoparticles can be controlled by the volume fraction of Co particles, which is adjusted by the sputtering time of Co. With the decrease of the amount of Co, the transport properties of thin films showed a transition from a metallic to a semiconductorlike behavior. The sample with a semiconductorlike behavior showed a superparamagnetic behavior with a blocking temperature around 130 K . The blocking temperature of the Co particles was found to decrease with the decrease of Co sputtering time, indicating a decrease in the average particle size because of the shorter sputtering time.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1846512