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We study the magnetic structure of the "stuffed" (Tb-rich) pyrochlore iridateTb$_{2+x}$Ir$_{2-x}$O$_{7-y}$, using resonant elastic x-ray scattering (REXS).In order to disentangle contributions from Tb and Ir magnetic sublattices,experiments were performed at the Ir $L_3$ and Tb $M_5$ edges, which provideselective sensitivity to Ir $5d$ and Tb $4f$ magnetic moments, respectively. Atthe Ir $L_3$ edge, we found the onset of long-range ${\bf k}={\bf 0}$ magneticorder below $T_{N}^\text{Ir}\sim$ 71 K, consistent with the expected signal ofall-in all-out (AIAO) magnetic order. Using a single-ion model to calculateREXS cross-sections, we estimate an ordered magnetic moment of$\mu_{5d}^{\text{Ir}} \approx 0.34(3)\,\mu_B$ at 5 K. At the Tb $M_5$ edge,long-range ${\bf k}={\bf 0}$ magnetic order appeared below $\sim40$ K, alsoconsistent with an AIAO magnetic structure on the Tb site. Additional insightinto the magnetism of the Tb sublattice is gleaned from measurements at the$M_5$ edge in applied magnetic fields up to 6 T, which is found to completelysuppress the Tb AIAO magnetic order. In zero applied field, the observedgradual onset of the Tb sublattice magnetisation with temperature suggests thatit is induced by the magnetic order on the Ir site. The persistence of AIAOmagnetic order, despite the greatly reduced ordering temperature and momentsize compared to stoichiometric Tb$_{2}$Ir$_{2}$O$_{7}$, for which$T_{N}^{\text{Ir}} =130$ K and $\mu_{5d}^{\text{Ir}}=0.56\,\mu_B$, indicatesthat stuffing could be a viable means of tuning the strength of electroniccorrelations, thereby potentially offering a new strategy to achievetopologically non-trivial band crossings in pyrochlore iridates.

Selective probing of magnetic order on Tb and Ir sites in stuffed Tb$_{2+x}$Ir$_{2-x}$O$_{7-y}$ using resonant X-ray scattering