The effect of grinding on magnetic properties of agglomereted MnFe2O4 nanoparticles |
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Authors: | B. AslibeikiP. Kameli H. Salamati |
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Affiliation: | Department of Physics, Isfahan University of Technology, Isfahan 84156-83111, Iran |
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Abstract: | The effects of grinding on interparticle magnetic interactions for an ensemble of agglomerated MnFe2O4 nanoparticles have been studied. Structural analyses showed that by grinding the samples, a small variation in size of crystallites and lattice strain will occur. ac Magnetic susceptibility measurements under different conditions and spin dynamics analysis suggest that freezing temperature is frequency dependent and it is in good agreement with critical slowing down model. This is an indication that these nanoparticles have superspin glass behavior. The estimated zυ and τ0 parameters using critical slowing down model show that by increasing the grinding time the interaction between nanoparticles decreases. ac Susceptibility measurements in cooling and heating process show a thermal hysteresis. The thermal hysteresis decreased by increasing the grinding time. Also, the thermal hysteresis is frequency dependent and it increased as frequency decreased. These results showed that interparticle interactions such as dipole-dipole and exchange interactions between nanoparticles become weaker by grinding. |
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Keywords: | Nanoparticle Magnetic interaction Dynamic susceptibility Superspin-glass |
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