4.5 Article Proceedings Paper

Experimental evidence of surface effects in the magnetic dynamics behavior of ferrite nanoparticles

期刊

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
卷 289, 期 -, 页码 118-121

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ELSEVIER
DOI: 10.1016/j.jmmm.2004.11.035

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magnetic liquids; magnetic naoparticles; spinel ferrites; surface effects; magnetic dynamics

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The magnetic dynamics behavior of copper and nickel ferrite nanoparticles used in the magnetic fluid elaboration and with mean sizes between 3.5 to 10.4 nm is investigated by measurements of magnetic hysteretic properties and zero field cooling (ZFC) susceptibility. The dependence of the irreversibility field, inversely proportional to the particle size, clearly indicates that the magnetic anisotropy of our particles finds its origin on the surface layer. (c) 2004 Elsevier B.V. All rights reserved.

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