Abstract
We use XMCD at the L2,3 edges of iron to analyze the site-specific magnetic contributions of ions in nanoparticles of maghemite, γ-Fe2O3. Maghemite is the oxidized form of magnetite Fe3O4. We report results of the study of the magnetic order on tetrahedral and octahedral magnetic sublattices in γ-Fe2O3 nanoparticles as a function of the applied magnetic field. Magnetic contributions of Fe3+Oh and Fe3+Td are determined using the Ligand Field Multiplet theory. It is found that when the external field decreases, the magnetic contribution of Fe3+ ions on octahedral sites is significantly reduced by comparison to the contribution of Fe3+ ions on tetrahedral ones. This shows that a higher degree of canting exits on octahedral sites.
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