Anomalous magnetic antiresonance and resonance in ferrite nanoparticles embedded in opal matrix

► The electromagnetic properties of opal matrix with the ferrite particles have been studied. ► Variations in the transmission and reflection are caused by magnetic resonance and antiresonance. ► Magnetic antiresonance has been defined here as a minimum of the absorbed power. ► The spectra of the resonances of reflection coefficient are restored.