Eur. Phys. J. Appl. Phys.
Volume 28, Number 1, October 2004
|Page(s)||73 - 77|
|Section||Nanomaterials and Nanotechnologies|
|Published online||25 August 2004|
Structural and magnetic characterization of Co-Cu nanoparticles prepared by arc-discharge
Shenyang National Laboratory for Materials Science, Institute of
Metal Research and International Centre for Materials Physics, Chinese
Academy of Sciences, Shenyang 110016, P.R. China
2 Institute of Experimental Physics, Slovak Academy of Sciences, 04353 Kosice, Slovakia
3 Laboratory of Ultrafine Particles, Shenyang Polytechnic University, Shenyang 110023, P.R. China
Corresponding author: email@example.com
Revised: 17 March 2004
Accepted: 23 March 2004
Published online: 25 August 2004
The structure and magnetic properties of the nanoparticles of immiscible system Co20Cu80 prepared by means of arc-discharge, have been studied in detail. The diameters of the particles are about 20 ~ 30 nm and a core/shell structure forms. The cores are Co-Cu solutions, which show some small Co precipitates, encapsulated with a shell of cupper oxide or cobalt oxide as observed by means of high-resolution transmission electron microscope (HRTEM) and energy dispersive X-ray (EDS). The loop shift in the hysteresis loop indicates the existence of the exchange bias between ferromagnetic and antiferromagnetic components at low temperatures. A block temperature about 180 K has been observed for as-deposited nanoparticles. For the annealed nanoparticles, the thermal magnetization at low temperatures is satisfied with Bloch's law.
PACS: 61.46.+w – Nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals / 81.07.Wx – Nanopowders / 75.50.Tt – Fine-particle systems; nanocrystalline materials
© EDP Sciences, 2004
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