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Magnetic Investigation of Carbon Coated Co-, Ni- and Fe-Nanoparticles

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Makarewicz M., Podsiadły M., Bałanda M.

Acta Physica Polonica A

2009

vol. 115

issue 2

568-571

Carbon coated cobalt-, nickel- and iron-nanoparticles were prepared by chemical method and their structural and magnetic properties were investigated. The samples were synthesized by carburization of the nanocrystalline form of the appropriate metal in CH_4, followed up by the reduction of the obtained carbon deposits. The X-ray diffraction and transmission electron microscopy study revealed carbon coated Co-, Ni- and Fe-nanocapsules of the mean size ca. 50 nm, and a small amount of carbon nanotubes. The measurements of magnetization and AC susceptibility were carried out for samples with different carbon content. A special attention was paid to the low temperature magnetic behavior. Decrease in the saturation moment at T=4.2 K due to the nanosize of the particles was stronger for the samples with higher carbon content, while the coercivity field (610 Oe, 330 Oe and 390 Oe, for Co-, Ni-, and Fe-particles, respectively) was independent of carbon content. From the temperature dependence of AC and DC susceptibility a wide size distribution of the particles and blocking temperature above room temperature could be expected.

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1 Acta Physica Polonica A

1 2009

1 Bałanda M.

1 Makarewicz M.

1 Podsiadły M.

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Magnetic Investigation of Carbon Coated Co-, Ni- and Fe-Nanoparticles