Nh. Duc et al., Structural, magnetic, Mossbauer and magnetostrictive studies of amorphous Tb(Fe0.55Co0.45)(1.5) films, J PHYS-COND, 12(38), 2000, pp. 8283-8293
Films with a nominal composition of Tb(Fe0.55Co0.45)(1.5) were fabricated b
y rf-magnetron sputtering from a fixed target configuration at various Ar g
as pressures. Samples were investigated by means of x-ray diffraction (XRD)
, scanning electron microscopy (SEM), vibrating sample magnetometer (VSM),
conversion electron Mossbauer spectra (CEMS) and magnetostriction measureme
nts. As the Ar pressure increases, the Tb and Fe content increases slightly
, whereas the Co content decreases. In addition, a small amount of Ar is in
troduced into the films. The as-deposited films are amorphous alloys, but t
heir magnetic behaviour depends strongly on the deposition conditions: a pe
rpendicular magnetic anisotropy is obtained only in film deposited at lowes
t Ar pressure and a parallel magnetic anisotropy exhibits in remaining film
s. These samples show an intrinsic magnetostriction (lambda approximate to
10(-3)) in an applied field of 0.7 T. In this state, it was determined that
the hyperfine field reaches the value B-hf = 24.5 T. Effects of the heat t
reatment on the magnetostrictive softness are also reported. The parallel m
agnetostriction with a huge magnetostrictive susceptibility (chi(lambda) =
1.8 X 10(-2) T-1) obtained at (mu(0)H = 10 mT) makes these materials useful
for applications.