Spin Disorder and Magnetic Anisotropy in Fe3O4 Nanoparticles

Details Spin Disorder and Magnetic Anisotropy in Fe3O4 Nanoparticles Spin Disorder and Magnetic Anisotropy in Fe3O4 Nanoparticles

2005-05-30

arxiv.org/abs/cond-mat/0505682v5

Journal of Applied Physics, 99 (2006) 083908

Physics

Condensed Matter

Materials Science

11 pages, 7 figures, 3 Tables

Scientific paper

10.1063/1.2191471

We have studied the magnetic behavior of dextran-coated magnetite (Fe$_3$O$_4$) nanoparticles with median particle size $\left=8$ $nm$. Magnetization curves and in-field M\"ossbauer 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, $T_B(H,\omega)$, suggests that the observed non-monotonic behavior is governed by the strength of interparticle interactions.

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