Magnetodielectric effect of Mn–Zn ferrite at resonant frequency

•Dimensional resonance was measured in dielectric spectrum at f≈1 MHz.•The MD ratio of 4500% was induced by H = 3.5 kOe at resonant frequency.•The magnetostriction effect leads to the large MD effect at resonant frequency.

The dielectric properties and the magnetodielectric effect in Mn–Zn ferrite at resonant frequency have been studied in this paper. Dimensional-resonance-induced abnormal dielectric spectrum was observed at f≈1 MHz. The relatively large magnetodielectric ratio of 4500% in a magnetic field of 3.5 kOe was achieved from the Mn–Zn ferrite sample with the initial permeability of 15 K at resonant frequency at room temperature. Theoretical analysis suggests that the large MD effect at resonant frequency is attributed to the enhanced magnetostriction effect.