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Molecules 2014, 19(6), 8387-8401; doi:10.3390/molecules19068387
Article

Microwave Resonant and Zero-Field Absorption Study of Doped Magnetite Prepared by a Co-Precipitation Method

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Received: 12 May 2014 / Revised: 7 June 2014 / Accepted: 10 June 2014 / Published: 19 June 2014
(This article belongs to the Special Issue Bio and Nanomaterials Based on Fe3O4)
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Abstract

Fe3O4 and ZnxFe3−xO4 pure and doped magnetite magnetic nanoparticles (NPs) were prepared in aqueous solution (Series A) or in a water-ethyl alcohol mixture (Series B) by the co-precipitation method. Only one ferromagnetic resonance line was observed in all cases under consideration indicating that the materials are magnetically uniform. The shortfall in the resonance fields from 3.27 kOe (for the frequency of 9.5 GHz) expected for spheres can be understood taking into account the dipolar forces, magnetoelasticity, or magnetocrystalline anisotropy. All samples show non-zero low field absorption. For Series A samples the grain size decreases with an increase of the Zn content. In this case zero field absorption does not correlate with the changes of the grain size. For Series B samples the grain size and zero field absorption behavior correlate with each other. The highest zero-field absorption corresponded to 0.2 zinc concentration in both A and B series. High zero-field absorption of Fe3O4 ferrite magnetic NPs can be interesting for biomedical applications.
Keywords: magnetic nanoparticles; co-precipitation method; magnetite; magnetic properties; microwave absorption magnetic nanoparticles; co-precipitation method; magnetite; magnetic properties; microwave absorption
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Aphesteguy, J.C.; Jacobo, S.E.; Lezama, L.; Kurlyandskaya, G.V.; Schegoleva, N.N. Microwave Resonant and Zero-Field Absorption Study of Doped Magnetite Prepared by a Co-Precipitation Method. Molecules 2014, 19, 8387-8401.

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