Abstract
Soft x-ray magnetic circular dichroism (MCD) data were collected at the Co $L$ edges from a series of epitaxial $R\ensuremath{-}\mathrm{Co}$ ($R=\mathrm{P}\mathrm{r},\phantom{\rule{0ex}{0ex}}\mathrm{N}\mathrm{d},\phantom{\rule{0ex}{0ex}}\mathrm{S}\mathrm{m},\phantom{\rule{0ex}{0ex}}\mathrm{D}\mathrm{y},\phantom{\rule{0ex}{0ex}}\mathrm{a}\mathrm{n}\mathrm{d}\phantom{\rule{0ex}{0ex}}\mathrm{H}\mathrm{o}$) intermetallic compound films grown by sputter deposition. The Co orbital-to-spin moment ratios were extracted from the data using the MCD sum rules. An enhanced Co orbital moment, as compared to that of bulk hcp-Co, is seen in all but one of the films. The enhancement is dependent on both the average $R\ensuremath{-}\mathrm{Co}$ bond length and on the $R$ species. These results suggest that a significant transition-metal (TM) orbital moment is the origin of the TM sublattice contribution to the magnetocrystalline anisotropy energy in $R\ensuremath{-}\mathrm{TM}$ compounds.
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