Investigations of the Structure and Tunable Magnetic Properties of Cu Doped Cobalt Chromite Nanoparticles

•Highly pure copper doped cobalt chromite nanoparticles have been prepared using conventional wet chemical co-precipitation method.•The average crystallite size of all the samples were found in between 11 nm and 16 nm.•The spin-spiral transition (TS) is observed near 25 K for pure and doped samples.•The spin-spiral transition TS vanishes with increasing doping amount of Cu.