Abstract
We report on a magnetic analysis by means of spin-resolved photoelectron spectroscopy of an atomically flat heteromagnetic rare-earth interface of 1 ML $\mathrm{Eu}∕\mathrm{Gd}(0001)$. The measurements reveal a high net Eu magnetization at low temperatures reflected by a spin polarization $\ensuremath{\sim}15%$ of the Eu $4f$ state. This magnetic Eu configuration is due to a strong ferromagnetic interlayer exchange coupling across the $\mathrm{Eu}∕\mathrm{Gd}$ interface which overcomes a weak negative intralayer coupling between Eu spins in the hexagonal two-dimensional lattice.
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