Abstract
It is shown that akagan\'eite $\ensuremath{\beta}$-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 akagan\'eite. In the nanoparticles, we find a drastic enhancement of the antiferromagnetic susceptibility, a phenomenon first predicted by N\'eel. Also, we find that akagan\'eite nanoparticles possess a thermoinduced magnetic moment.
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