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Structural and magnetic characterization of Co-Cu nanoparticles prepared by arc-discharge

Published online by Cambridge University Press:  25 August 2004

Cai-yin You ,
Z. Q. Yang ,
Q. F. Xiao ,
I. Škorvánek ,
J. Kováč ,
Z. J. Li ,
W. Liu  and
Z. D. Zhang
Cai-yin You*
Affiliation:
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
Z. Q. Yang
Affiliation:
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
Q. F. Xiao
Affiliation:
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
I. Škorvánek
Affiliation:
Institute of Experimental Physics, Slovak Academy of Sciences, 04353 Kosice, Slovakia
J. Kováč
Affiliation:
Institute of Experimental Physics, Slovak Academy of Sciences, 04353 Kosice, Slovakia
Z. J. Li
Affiliation:
Laboratory of Ultrafine Particles, Shenyang Polytechnic University, Shenyang 110023, P.R. China
W. Liu
Affiliation:
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
Z. D. Zhang
Affiliation:
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
*
[email protected]
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Abstract

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. 


Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 28 , Issue 1 , October 2004 , pp. 73 - 77
Copyright
© EDP Sciences, 2004

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