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It is shown that akaganéite β-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.
This work has been funded by the Spanish MICINN and FEDER, Projects No. MAT2007-61621 and No. MAT2009-13977-C03 (MOLCHIP), Project No. CSD 2007-00010 (CONSOLIDER), and DGA Project NABISUP. A.U. acknowledges the financial support provided by contract from the EC NoE “MAGMANET.” Part of this work has been supported by EuroMagNET under the EU Contract No. RII3-CT-2004-506239.
7 páginas, 6 figuras.
Peer reviewed
Correlated Electron Systems / High Field Magnet Laboratory (HFML)
Correlated Electron Systems / High Field Magnet Laboratory (HFML)
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