  Element-specific orbital magnetic moments and their anisotropies in
perpendicularly magnetised Co/Pd multilayers are investigated using Co L-edge
and Pd M-edge angle-dependent x-ray magnetic circular dichroism. We show that
the orbital magnetic moments in Co are anisotropic, whereas those in Pd are
isotropic. The first-principles density-functional-theory calculations also
suggest that the Co/Pd interfacial orbital magnetic moments in Co are
anisotropic and contribute to the perpendicular magnetic anisotropy (PMA), and
that the isotropic ones in Pd manipulates the Co orbitals at the interface
through proximity effects. Orbital-resolved anatomy of Co/Pd interfaces reveals
that the orbital moment anisotropy in Co and spin-flipped transition related to
the magnetic dipoles in Pd are essential for the appearance of PMA.
