  We report the particle size dependent magnetic behaviour in the
antiferromagnetic spinel CoRh2O4. The nanoparticles were obtained by mechanical
milling of bulk material, prepared under sintering method. The XRD spectra show
that the samples are retaining the spinel structure. The particle size
decreases from 70 nm to 16 nm as the milling time increases from 12 hours to 60
hours. The magnetic measurements suggest that the antiferromagnetic ordering at
T$_N$ $\approx$ 27K exists in bulk as well as in nanoparticle samples. However,
the magnitude of the magnetization below T$_N$ increases with decreasing
particle size.
