Influence of organic precursor on the structural and magnetic properties of Co3O4 nanoparticles |
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Authors: | RJS Lima KO Moura PP Pedra JGS Duque CT Meneses |
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Institution: | 1. Universidade Federal de Sergipe, Campus Prof. José Aloísio de Campos, Departamento de Física, 49100-000 São Cristóvão, SE, Brazil;2. Universidade Federal de Sergipe, Campus Prof. Alberto Carvalho, Departamento de Física, 49500-000 Itabaiana, SE, Brazil |
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Abstract: | Antiferromagnetic Co3O4 nanoparticles were synthesized by the coprecipitation method. With the addition of the sucrose as chelating agent (sucrose) the size of the particles was reduced from 54 nm to 19 nm. The Co3O4 nanoparticles exhibit a cubic spinel structure identified for X-ray diffraction (XRD) and confirmed by Rietveld refinement. Scanning Electron Microscopy (SEM) images exhibit a spherical-like morphology and confirm the decrease of the particle size observed by XRD. The magnetic measurements as a function of temperature using a superconducting quantum interference device (SQUID) show a large surface anisotropy for samples obtained with the addition of sucrose accompanied by an exchange Bias effect indicating also the existence of a weak ferromagnetism. A decrease of the Néel temperature from the bulk (and other nanostructures-type) was observed, which can be associated with finite-size effect in the nanoparticles' shape. |
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Keywords: | Nanoparticles Exchange Bias Effect of size |
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