Abstract: CoMnP alloy films were synthesized by electro-deposition technique. The electro-chemical deposition technique is especially interesting due to its low cost, high throughput and high quality of deposit. Magnetic thin films are extensively used in various electronic devices including high density recording media and Micro Electro-Mechanical Systems (MEMS). Electro-deposition being cost effective in the present study cobalt based magnetic films was deposited electrochemically and deposition characteristics were studied. Effect of concentration of organic additives such as urea and thiourea in the presence of the sodium hypophosphite was studied. Structural and surface morphology was investigated by X-Ray Diffractogram (XRD) and Scanning Electron Microscope (SEM), respectively. The content of Co, Mn and P was analyzed using Energy Dispersive X-ray Spectroscopy (EDS) technique. The hysteresis loops of the CoMnP alloy films were measured by a Vibrating Sample Magnetometer (VSM) and studies showed that organic additive has altered the magnetic properties of the films. The reason for the change in magnetic properties and structural characteristics because of the additive were discussed. Mechanical properties such as residual stress, hardness and adhesion of the films were also examined and reported.