Polycrystalline garnet of the system Y
3-2x-y-zGd
zCa
2x+yFe
5-x-yV
xZr
yO
12was investigated. Relatively temperature-stable magnetization near room temperature and narrow ferrimagnetic resonance linewidth (

Oe) were obtained for the composition range of

and

respectively. The lowest value of linewidth at z=1.0 was 5.2 Oe at the composition of x=0.4 and y=0.6, which suggests the remarkable reduction of anisotropy.