Polycrystalline garnets of the composition Ca
3-yY
yFe
2-xSn
xFe
1.5+0.5x+0.5y-0.5zGe
zV
1.5-0.5x-0.5y-0.5zO
12with

, and

were studied. Narrow linewidth (

Oe) could be obtained within the composition range of

, and

, where the materials had low saturation magnetization and relatively high Curie temperature. From the field dependence of effective linewidth, it was confirmed that the materials with

Oe had very high density and small anisotropy field.