Magnetodielectric effect in nickel nanosheet-Na-4 mica composites

TL;DR

This study demonstrates room-temperature magnetodielectric effects in nickel nanosheet-Na-4 mica composites, showing a 5% dielectric constant change under magnetic fields, with potential for sensor applications.

Contribution

It introduces a novel synthesis of nickel nanosheet-Na-4 mica composites exhibiting magnetodielectric effects at room temperature.

Findings

5% decrease in dielectric constant at 1.2 Tesla

Magnetodielectric effect observed across 100-700 kHz frequency range

Inhomogeneous composite model explains the effect

Abstract

Nickel nanosheets of thickness 0.6 nm were grown within the nanochannels of Na-4 mica template. The specimens show magnetodielectric effect at room temperature with a change of dielectric constant as a function of magnetic field, the electric field frequency varying from 100 to 700 kHz. A decrease of 5% in the value of dielectric constant was observed up to a field of 1.2 Tesla. This is explained by an inhomogeneous two-component composite model as theoretically proposed recently. The present approach will open up synthesis of various nanocomposites for sensor applications.