Polycrystalline calcium-vanadium garnets with narrow ferrimagnetic resonance linewidth

Polycrystalline garnets of the composition Ca
3-y
Y
y
Fe
2-x
Sn
x
Fe
1.5+0.5x+0.5y-0.5z
Ge
z
V
1.5-0.5x-0.5y-0.5z
O
12
with
0 \leq x \leq 1.0, 0 \leq y \leq 2.2
, and
0 \leq z \leq 1.0
were studied. Narrow linewidth (
\Delta H \leq 10
Oe) could be obtained within the composition range of
0.3 \leq x \leq 0.4, 1.2 \leq y \leq 1.6
, and
0 \leq z \leq 0.8
, 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
\Delta H \leq 10
Oe had very high density and small anisotropy field.