Low temperature electron paramagnetic resonance anomalies in Fe-based nanoparticles
Authors:
- 1 August 2000
- journal article
- Published by AIP Publishing in Journal of Applied Physics
- Vol. 88 (3) , 1587-1592
Abstract
A study of the electron paramagnetic resonance of Fe-based nanoparticles embedded in polyethylene matrix was performed as a function of temperature ranging from 3.5 to 500 K. Nanoparticles with a narrow size distribution were prepared by the high-velocity thermodestruction of iron-containing compounds. A temperature-driven transition from superparamagnetic to ferromagnetic resonance was observed for samples with different Fe content. The unusual behavior of the spectra at about 25 K is considered evidence of a spin-glass state in iron oxide nanoparticles.Keywords
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