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We have grown a series of nickel substituted single crystals of the layeredferromagnet (FM) Fe$_3$GeTe$_2$. The large single crystalline samples of(Fe$_{1-x}$Ni$_x$)$_3$GeTe$_2$ with $x = 0-0.84$ were characterized with singlecrystal X-ray diffraction, magnetic susceptibility, electrical resistance andmuon spin spectroscopy. We find Fe can be continuously substituted with Ni withonly minor structural variation. In addition, FM order is suppressed from$T_\mathrm{C}=212$~K for $x=0$ down to $T_\mathrm{C}=50$~K for $x=0.3$, whichis accompanied with a strong suppression of saturated and effective moment, andCurie-Weiss temperature. Beyond $x=0.3$, the FM order is continuously smearedinto a FM cluster glass phase, with a nearly full magnetic volume fraction. Weattribute the observed change in the nature of magnetic order to theintrinsically disordered structure of Fe$_3$GeTe$_2$ and subsequent dilutioneffects from the Ni substitution.

The Effect of Nickel Substitution on Magnetism in the Layered van der Waals Ferromagnet Fe$_3$GeTe$_2$