Observation of 300 K High Energy MagnetoDielectric Response in the Bilayer Manganite (La$_{0.4}$Pr$_{0.6}$)$_{1.2}$Sr$_{1.8}$Mn$_2$O$_7$

TL;DR

This study reports a significant magneto-dielectric effect at room temperature in a bilayer manganite, driven by a field-induced transition, highlighting potential for electronic control of dielectric properties.

Contribution

First observation of high energy magneto-dielectric response at 300 K in bilayer manganite, linking spin-glass to ferromagnetic transition with dielectric contrast.

Findings

Large HEMD effect observed at room temperature.

Field-driven spin-glass to ferromagnetic transition.

Potential for electronic control of dielectric properties.

Abstract

We observed a large HEMD effect in the bilayer manganite (La$_{0.4}$Pr$_{0.6}$)$_{1.2}$Sr$_{1.8}$Mn$_2$O$_7$, a direct consequence of field driven spin-glass insulator to ferromagnetic metal transition. The remnants of the transition can be used to achieve dielectric contrast at room temperature. This discovery suggests that electronic mechanisms such as the metal-insulator transition, charge ordering, and orbital ordering can be exploited to give substantial dielectric contrast in other materials.