Thin film amorphous samples of (Gd1-xCox)(1-y)Re-y (a-GdCoRe) have been gro
wn using a RF sputtering system. In order to consider these ferrimagnetic a
-GdCoRe alloys for application in bubble devices, we have studied the tempe
rature dependence of the saturation magnetization (M-s) and coercivity (H-c
) as a function of composition, in the concentration range 0.74 <s <0.84, 0
.08 <y <0.12. From M-s vs. T plots, compensation temperatures (T-comp) have
been determined for all samples. The temperature dependence of the coerciv
ity (H-c vs. T) displays the sharp maximum at the compensation temperature
(T-comp) that is characteristic of ferrimagnetic amorphous alloys. All the
samples studied show perpendicular anisotropy. The effect of Re addition on
the magnetic properties of a-GdCo alloys will be discussed in comparison t
o those of other elements, as Mo. (C) 2001 Elsevier Science B.V. All rights
reserved.