STRONG MAGNETIC LINEAR DICHROISM IN FE L23 AND O K ELECTRON ENERGY-LOSS NEAR-EDGE SPECTRA OF ANTIFERROMAGNETIC HEMATITE α-FE2O3
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dc.contributor.author | van Aken P.A. | |
dc.contributor.author | Lauterbach S. | |
dc.date.accessioned | 2022-02-13T04:46:08Z | |
dc.date.available | 2022-02-13T04:46:08Z | |
dc.date.issued | 2003 | |
dc.identifier | https://elibrary.ru/item.asp?id=5108133 | |
dc.identifier.citation | Physics and Chemistry of Minerals, 2003, 30, 8, 469-477 | |
dc.identifier.issn | 0342-1791 | |
dc.identifier.uri | https://repository.geologyscience.ru/handle/123456789/35273 | |
dc.description.abstract | We report strong magnetic linear dichroism (MLD) at the Fe L23 and O K edges of the antiferromagnetic compound hematite α-Fe2 O3 in high-resolution orientation- and temperature-dependent electron energy-loss spectroscopy (EELS). Large intensity differences of corresponding spectral features are observed when the Fe L23 and O K edges are measured with momentum transfer either parallel or perpendicular to the magnetization. The resultant difference spectra for the Fe L23 edges is consistent with the MLD observed in X-ray absorption spectroscopy. For the first time we have observed MLD at the O K edge, where the magnetic origin of this dichroism is demonstrated by temperature-dependent investigations across the Morin transition temperature TM= 263 K, at which the Fe electron spins, i.e. the magnetic moments, rotate by 90°. The O K edge MLD is interpreted in terms of superexchange between the spins of the Fe 3d and O 2p electrons through overlapping Fe 3d and O 2p orbitals. The experiments were performed in a transmission electron microscope (TEM), yielding information about the anisotropic electronic structure at nanoscale spatial resolution when operated with a focused electron probe. The effects of MLD at the Fe L23 edges on the determination of Fe3+/ΣFe in hematite at submicrometre scale using different independent quantification methods are discussed. | |
dc.subject | MAGNETIC LINEAR DICHROISM (MLD) | |
dc.subject | ELECTRON ENERGY-LOSS SPECTROSCOPY (EELS) | |
dc.subject | ENERGY-LOSS NEAR-EDGE STRUCTURE (ELNES) | |
dc.subject | TRANSMISSION ELECTRON MICROSCOPY (TEM) | |
dc.subject | HEMATITE | |
dc.subject | FERROUS/FERRIC RATIOS | |
dc.title | STRONG MAGNETIC LINEAR DICHROISM IN FE L23 AND O K ELECTRON ENERGY-LOSS NEAR-EDGE SPECTRA OF ANTIFERROMAGNETIC HEMATITE α-FE2O3 | |
dc.type | Статья |
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