Tunable microwave absorption in CoAl substituted M-type BaSr hexagonal ferrite

The parameters and mechanisms for maximum reflection loss (RL) or microwave absorption in Ba0.5Sr0.5CoxAlxFe12-2xO19 ferrites (x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0) (a) maximum RL vs. frequency (b) Quarter wavelength mechanism (c) Impedance matching mechanism (d) -10 dB and − 20 dB bandwidth (BW) for RL ≥ − 10 dB and − 20 dB.220