  Quantum materials that feature magnetic long-range order often reveal complex
phase diagrams when localized electrons become mobile. In many materials
magnetism is rapidly suppressed as electronic charges dissolve into the
conduction band. In materials where magnetism persists, it is unclear how the
magnetic properties are affected. Here we study the evolution of the magnetic
structure in Nd(1-x)Ce(x)CoIn(5) from the localized to the highly itinerant
limit. We observe two magnetic ground states inside a heavy-fermion phase that
are detached from unconventional superconductivity. The presence of two
different magnetic phases provides evidence that increasing charge
delocalization affects the magnetic interactions via anisotropic band
hybridization.
