Spin Disorder and Magnetic Anisotropy in Fe3O4 Nanoparticles

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dc.creatorLima Jr., E.
dc.creatorBrandl, A. L.
dc.creatorArelaro, A. D.
dc.creatorGoya, G. F.
dc.date2005-05-30
dc.date2006-05-26
dc.date.accessioned2026-07-07T06:37:52Z
dc.date.available2026-07-07T06:37:52Z
dc.descriptionWe have studied the magnetic behavior of dextran-coated magnetite (Fe$_3$O$_4$) nanoparticles with median particle size $\left<d\right>=8$ $nm$. Magnetization curves and in-field Mössbauer spectroscopy measurements showed that the magnetic moment $M_S$ of the particles was much smaller than the bulk material. However, we found no evidence of magnetic irreversibility or non-saturating behavior at high fields, usually associated to spin canting. The values of magnetic anisotropy $K_{eff}$ from different techniques indicate that surface or shape contributions are negligible. It is proposed that these particles have bulk-like ferrimagnetic structure with ordered A and B sublattices, but nearly compensated magnetic moments. The dependence of the blocking temperature with frequency and applied fields, $T_B(H,ω)$, suggests that the observed non-monotonic behavior is governed by the strength of interparticle interactions.
dc.description11 pages, 7 figures, 3 Tables
dc.identifierhttps://arxiv.org/abs/cond-mat/0505682
dc.identifierhttp://arxiv.org/abs/cond-mat/0505682
dc.identifierJournal of Applied Physics, 99 (2006) 083908
dc.identifierdoi:10.1063/1.2191471
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/100542
dc.subjectMaterials Science
dc.titleSpin Disorder and Magnetic Anisotropy in Fe3O4 Nanoparticles
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