The properties of hard magnetic CoNiP films electrodeposited in presence of organic additive in various concentrations were studied with respect to thickness of the films. Films were electrodeposited in various current densities and for different time in order to get different thickness and uniform deposits. Elemental composition of the films was obtained using atomic absorption spectrometry. The phosphorous content was found to be less than 1%. Vibrating sample magnetometric studies indicate that organic additive has favourable impact on the magnetic properties of these films. Surface structural analysis was carried Out using X-ray diffractometry and scanning electron microscopy. Reasons for variation in magnetic properties and structural characteristics are discussed. Hardness and adhesion of the films were also studied. Crown Copyright (c) 2006 Published by Elsevier B.V. All rights reserved.