Giant magnetocapacitance effect in nickel zinc ferrite impregnated mesoporous silica

Mesoporous silica with a pore diameter of around 5 nm was synthesized by a solution technique. Nickel zinc ferrite (NZF) phase was grown within these nanochannels. The dielectric permittivity showed dispersion as a function of frequency characteristic of a Maxwell–Wagner capacitor. The nanocomposite exhibited a large magneto-capacitance coefficient of 44% at room temperature at an applied magnetic field of 1.5 T. The dielectric loss of the nanocomposite was fairly low (~ 0.01). The present strategy of composite synthesis will lead to the preparation of materials having large values of magneto-capacitive coefficients for device applications.

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► Synthesis of nickel zinc ferrite supported mesoporous silica nanocomposite (NC).
► The NC exhibits a magneto-capacitance coefficient of 44% at room temperature.
► The dielectric loss of the nanocomposites was fairly low (~0.01).