Abstract
The hexagonal structure of ferromagnetic Fe in Fe/Ru superlattices is still controversial. The unexpected magnetic behaviour [1] as well as the X-ray absorption near-edge structure (XANES) results have led Beaudelet [2] to question the hcp structure for the Fe layers and to suggest another model of the Fe hexagonal stacking in which the local environment of Fe atoms looks like a distorted bcc one, despite the epitaxy on (0001) hcp Ru. To verify the existence of this unusual hexagonal stacking, we have undertaken an X-ray diffraction study performed with grazing incidence angle. Unexpectedly, our results support convincingly the regular hcp structure rather than the ‘bcc-like’ packing.
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