Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 224, Issue 1, Pages 5-11Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0304-8853(00)01328-7
Keywords
fine particles; hematite; irreversible magnetization; weak ferromagnetism
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The magnetic properties of Fe2O3 nanoparticles (average diameter O congruent to 3 nm) in alumina (68% Fe2O3 in weight) have been investigated by magnetization measurements. The results indicate a superparamagnetic behavior of interacting particles, which block with decreasing temperature (the zero-field-cooled susceptibility shows a maximum at T congruent to 145 K) with a distribution of relaxation times. A change of magnetic regime is observed below similar to 60 K, due to the increasing interparticle interactions and local surface anisotropy. (C) 2001 Elsevier Science B.V. All rights reserved.
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