Published in
American Physical Society, Physical review B, 21(83), 2011
DOI: 10.1103/physrevb.83.214426
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Thermoinduced magnetic moment in akaganeite nanoparticles
,
U. Zeitler
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Abstract
It is shown that akaganéite beta-FeOOH provides a good model material to experimentally investigate thermoinduced magnetic moments in antiferromagnetic nanoparticles. We characterize the magnetic properties, exchange field, anisotropy field, and antiferromagnetic susceptibility of bulk akaganéite. In the nanoparticles, we find a drastic enhancement of the antiferromagnetic susceptibility, a phenomenon first predicted by Néel. Also, we find that akaganéite nanoparticles possess a thermoinduced magnetic moment.