Abstract: The invention relates to a process for forming a cobalt-iron alloy film. In particular, the process is performed under ultrasonic vibrations to form the cobalt-iron alloy film. The cobalt-iron alloy film consists of about 75-95 wt. % of cobalt, 4.5-20 wt. % of iron and 0.5-5 wt. % of phosphorus and also has peaks at about 43.2, 45.1, 50.4, 65.5, 74.1 and 83.2 2-theta degree (2?) in the X-ray diffraction pattern.