X-ray magnetic circular dichroism study of iron/iron oxide granular nanostructures

Signorini, Luca; Pasquini, Luca; Boscherini, Federico; Bonetti, E.; Letard, I.; Brice-Profeta, S.; Sainctavit, Philippe

doi:10.1016/j.nimb.2005.12.012

Cited by 6 publications

(2 citation statements)

References 12 publications

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“…3.2 Fe L 2,3 edge X-ray magnetic circular dichroism and moment analysis In the past, the orbital moment of magnetite has been investigated many times by XMCD [13,15,16,[18][19][20][42][43][44][45][46][47][48][49], where large [13] and more recently nearly vanishing [5,16] orbital moments have been reported. It has been shown that the absolute spin and orbital moments and the shape of the spectra strongly depend on the quality of the single-crystal sample and its preparation, of thin-film preparation, and on the integration range used in the sum-rule analysis, as discussed above.…”

Section: Physicamentioning

confidence: 99%

Large hidden orbital moments in magnetite

Goering

2011

Physica Status Solidi (b)

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The orbital magnetic moments in magnetite have recently been discussed with strong controversy. Here, the presence of orbital moments has been revealed by the independent analysis of the Fe L 2,3 edge X-ray absorption spectroscopy (XAS) spectra, a moment analysis fit of the Fe L 2,3 edge X-ray magnetic circular dichroism (XMCD), and by the comparison with O K edge XMCD. These orbital moments are located at the A and B sites of magnetite and aligned antiparallel with each other, similar to the spin moments. They also cancel each other and are not observable by methods averaging over the whole unit cell. These findings have strong implications for the understanding of the A and B site valence states, because the existence of orbital moments is also an indicator for the half-metallic character of magnetite.

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Section: Physicamentioning

confidence: 99%

Large hidden orbital moments in magnetite

Goering

2011

Physica Status Solidi (b)

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“…A significant amount of work has been done on the effect of site occupancy on XMCD. Iron is of particular interest with simulations (Carvallo et al, 2008;Brice-Profeta et al, 2005b,a;Nappini et al, 2015) and experimental data (Signorini et al, 2006;Guyodo et al, 2012;Wang et al, 2013;Kim et al, 2009b) showing that site geometry and ratios of occupancy directly impact the XMCD spectra. In the simulations, we see stark differences between Fe 2+ (O h ), Fe 3+ (O h ), and Fe 3+ (T d ).…”

Section: Cobalt Flipmentioning

confidence: 99%