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Low Field Microwave Absorption in Ni–Zn Ferrite Nanoparticles in Different Aggregation States

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Ferrite nanoparticles of composition Zn0.5Ni0.5Fe2O4 with average diameter of 5–8 nm were prepared by forced hydrolysis in polyol from the corresponding iron, nickel and zinc acetates, in different states of aggregation, by playing with the preparation parameters. High-resolution transmission electron microscopy showed that for the aggregated state, there was a good agreement of crystal planes between neighboring nanoparticles. δ-M magnetization studies revealed that magnetic interactions between nanoparticles have an exchange character in the agglomerated state, while it is clearly dipolar in the monodispersed state. Low field microwave absorption (LFMA) measurements at 9.4 GHz at 300 K confirmed that non-agglomerated nanoparticles are superparamagnetic, while clustered ones retained ferrimagnetic properties. At 77 K, agglomerated nanoparticles exhibited a complex LFMA which can be ascribed to the Yafet-Kittel triangular arrangement of spins on A and B spinel sites.
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Keywords: MAGNETIC INTERACTIONS; MAGNETIC NANOPARTICLES; NON-RESONANT MICROWAVE ABSORPTION; SPINELS

Document Type: Short Communication

Publication date: August 1, 2011

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  • Nanoscience and Nanotechnology Letters (NNL) is a multidisciplinary peer-reviewed journal consolidating nanoscale research activities in all disciplines of science, engineering and medicine into a single and unique reference source. NNL provides the means for scientists, engineers, medical experts and technocrats to publish original short research articles as communications/letters of important new scientific and technological findings, encompassing the fundamental and applied research in all disciplines of the physical sciences, engineering and medicine.
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