| Issue |
Eur. Phys. J. Appl. Phys.
Volume 28, Number 1, October 2004
|
|
|---|---|---|
| Page(s) | 73 - 77 | |
| Section | Nanomaterials and Nanotechnologies | |
| DOI | https://doi.org/10.1051/epjap:2004173 | |
| Published online | 25 August 2004 | |
https://doi.org/10.1051/epjap:2004173
Structural and magnetic characterization of Co-Cu nanoparticles prepared by arc-discharge
1
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: cyyou75@hotmail.com
Received:
18
November
2003
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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