Abstract
Seemingly inconsequential chemical substitutions make control and manipulation of interactions between heavy and light lanthanides and, therefore, informed design of novel materials and unique magnetic functionalities possible.The antiparallel alignment between the magnetic moments of crystallographically indistinguishable Pr and Gd in the Pr${}_{1\ensuremath{-}x}$Gd${}_{x}$ScGe system, directly probed with x-ray magnetic circular dichroism, results in magnetic compensation, unusual magnetic memory, and, when coupled with minor perturbations in the otherwise uniform lanthanide distribution, large exchange bias. Similar phenomena are predicted in other mixed-lanthanide systems where the localized magnetic moments of heavy and light lanthanides nearly cancel one another out at specific compositions.
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