and Hchave been measured for vapor-deposited nonmagnetostrictive Co-Ni-Fe films, 1500 Å thick. All parameters except Hchave been measured using the transverse-biased permeability apparatus. Hkincreases linearly with cobalt melt content up to 15-percent cobalt, and Hcincrease with increasing cobalt and substrate temperature. α90decreases in the region 0-15-percent cobalt and then increases with increased cobalt melt content and substrate temperature. The coefficient of magnetoelastic composition sensitivity is the slope of the curve η versus the ratio of nickel to iron in the melt for a constant cobalt percentage about the point . The value of increases rapidly with substrate temperature to a maximum near 300°C if the cobalt percentage is small. For larger amounts of cobalt is reduced and is more independent of temperature. It is proposed that the volume fraction and the mobility of the grain boundaries in the film structure are primarily responsible for .