Ferrite composition | Lower frequency bands ν1 (cm−1) | Higher frequency bands ν2 (cm−1) |
CoFe2 O4 | 592.55 | 393.50 |
CoBi0.05 Fe1.95O4 | 591.33 | 369.10 |
CoBi0.10 Fe1.90O4 | 593.65 | 384.09 |
CoBi0.15 Fe1.85O4 | 596.15 | 385.68 |
CoBi0.20 Fe1.80O4 | 591.63 | 368.50 |
CoBi0.25 Fe1.75O4 | 592.55 | 385.60 |