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We synthesized a series of GdFe$_{1-x}$Co$_x$AsO polycrystalline samples ($0\leq x \leq 1$) by using a solid state reaction method and present a systematicstudy on the physical properties by means of electrical resistivity $\rho(T)$,magnetic susceptibility $\chi(T)$ and specific heat $C(T)$. The parent compoundGdFeAsO undergoes a spin-density-wave (SDW) transition associated with Fe3d-electrons around 130 K, followed by an antiferromagnetic (AFM) transition ofGd at $T^\textup{Gd}_\textup{N} \approx$ 4 K. The SDW transition is quicklysuppressed by Fe/Co substitution and superconductivity appears in a narrowdoping range of $0.05 < x < 0.25$, showing a maximum $T_\textup{sc}$ $\approx$20 K around $x = 0.1$. On the other hand, the 4f-electrons of Gd areantiferromagnetically ordered over the entire doping concentration ($0 \leq x\leq 1$), while the Co 3d-electrons exhibit a ferromagnetic (FM) transitionabove $x \approx 0.8$, with the Curie temperature ($T^\textup{Co}_\textup{C}$)reaching 75 K in GdCoAsO. These two magnetic species (Gd and Co) are coupledantiferromagnetically to give rise to ferrimagnetic behavior in magneticsusceptibility on the Co-rich side. For $0.7 \leq x < 1.0$, the systemundergoes a possible magnetic reorientation below $T^\textup{Gd}_\textup{N}$.

Moderate interaction between 3d- and 4f-electrons and ferrimagnetism in Co-doped GdFeAsO