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

  • Cai-yin You (a1), Z. Q. Yang (a1), Q. F. Xiao (a1), I. Škorvánek (a2), J. Kováč (a2), Z. J. Li (a3), W. Liu (a1) and Z. D. Zhang (a1)...

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. 


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

  • Cai-yin You (a1), Z. Q. Yang (a1), Q. F. Xiao (a1), I. Škorvánek (a2), J. Kováč (a2), Z. J. Li (a3), W. Liu (a1) and Z. D. Zhang (a1)...

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