Giant magnetodielectric effect and magnetic field tunable dielectric resonance in spinel MnZn ferrite

Yajie Chen; Xiao-Yu Zhang; Vittoria, Carmine; Harris, V. G.
March 2009
Applied Physics Letters;3/9/2009, Vol. 94 Issue 10, pN.PAG
Academic Journal
The sensitive response of the dielectric permittivity under the application of magnetic fields in Mn0.60Zn0.40Fe2.12O4+δ polycrystalline ferrite is presented. A magnetic field of 3.5 kOe induced a giant magnetodielectric {MD=[[variant_greek_epsilon]′(H)-[variant_greek_epsilon]′(0)]/[variant_greek_epsilon]′(0)} response, of 1800% at f=7 MHz, at room temperature. The ferrite exhibits a large magnetic field-induced frequency response of 180 Hz/Oe. We suggest that this effect arises primarily from a spin-dependent space charge polarization mechanism in response to the application of dc magnetic fields.


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