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The strong perpendicular magnetic anisotropy of $L{\rm1_0}$-ordered FePt hasbeen the subject of extensive studies for a long time. However, it is not knownwhich element, Fe or Pt, mainly contributes to the magnetic anisotropy energy(MAE). We have investigated the anisotropy of the orbital magnetic moments ofFe 3$d$ and Pt 5$d$ electrons in $L{\rm1_0}$-ordered FePt thin films by Fe andPt $L_{2,3}$-edge x-ray magnetic circular dichroism (XMCD) measurements forsamples with various degrees of long-range chemical order $S$. Fe$L_{2,3}$-edge XMCD showed that the orbital magnetic moment was larger when themagnetic field was applied perpendicular to the film than parallel to it, andthat the anisotropy of the orbital magnetic moment increased with $S$. Pt$L_{2,3}$-edge XMCD also showed that the orbital magnetic moment was smallerwhen the magnetic field was applied perpendicular to the film than parallel toit, opposite to the Fe $L_{2,3}$-edge XMCD results although the anisotropy ofthe orbital magnetic moment increases with $S$ like the Fe edge. These resultsare qualitatively consistent with the first-principles calculation by Solovyev${\it et\ al.}$ [Phys. Rev. B $\bf{52}$, 13419 (1995).], which also predictsthe dominant contributions of Pt 5$d$ to the magnetic anisotropy energy ratherthan Fe 3$d$ due to the strong spin-orbit coupling and the small spin splittingof the Pt 5$d$ bands in $L{\rm1_0}$-ordered FePt.

Magnetic anisotropy of $L1_0$-ordered FePt thin films studied by Fe and Pt $L_{2,3}$-edges x-ray magnetic circular dichroism