Size Effects on the Magnetic Properties of ZnFe2O4 Nanoparticles
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We report structural and magnetic measurements on ZnFe2O4 nanoparticles obtained through coprecipitation chemical method. The Rietveld analysis of X-ray patterns reveals that (i) our samples are single phase, (ii) the average particle size increases with synthesis temperature, and (iii) the cationic disorder increases with decreasing of the mean particle size. The Zero-Field-Cooled (ZFC) and Field-Cooled (FC) magnetization measurements show that the blocking temperature increases with increasing of the particle size and, to the sample grown at T=850 °C, it is possible to observe both Néel temperature to larger particles and blocking effects to smaller particles. Finally, we have observed that the coercive field does not decay with the square root of temperature following the Néel relaxation and Bean–Livingston approaches.
KeywordsNanoparticles Antiferromagnetism Coercive field
This work was supported by the CNPq and FAPITEC Brazilian agencies and UFS (PAIRD-Program).