The magnetic properties of Co-Ni-Fe films

H_{k} , \deltaH_{k} ,\alpha_{90}
and H
c
have been measured for vapor-deposited nonmagnetostrictive Co-Ni-Fe films, 1500 Å thick. All parameters except H
c
have been measured using the transverse-biased permeability apparatus. H
k
increases linearly with cobalt melt content up to 15-percent cobalt,
\deltaH_{k}
and H
c
increase with increasing cobalt and substrate temperature. α
90
decreases in the region 0-15-percent cobalt and then increases with increased cobalt melt content and substrate temperature. The coefficient of magnetoelastic composition sensitivity
S
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
\eta = 0
. The value of
S
increases rapidly with substrate temperature to a maximum near 300°C if the cobalt percentage is small. For larger amounts of cobalt
S
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
S
.