We have investigated the growth of Ni-Zn alloys by a dc electrodeposition method and a pulse dc electrodeposition method with different pulse frequencies, under otherwise the same growth conditions. Dendritic growth is found in the Ni-Zn alloys produced by pulse dc electrodeposition, whereas such growth is absent in those fabricated by dc electrodeposition. The morphology of the as-grown Ni-Zn dendrites is highly influenced by the pulse frequency. The possible growth mechanism has been discussed. The corresponding magnetic properties are investigated at 5 K using a superconducting quantum interference device. We have observed a clear variation in the magnetisation behaviour as the pulse frequency is changed, which is likely to be attributable to the presence of precipitation of Ni nanoparticles.