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