Fig. (3)
Dependencies of focal distances f
+
and f
–
on value of a spin wave frequency ω. α
1
= 5.44×10
-11
cm
2
, α
2
= 6×10
-11
cm
2
, β
1
= 10, β
2
= 15, ρ
2
= 2, L
1
= 25×10
5
cm
-1
, L
2
= 30×10
5
cm
-1
, M
01
= 105 G, M
02
= 95 G, H
0
= 1500 Oe.