Magnetodielectric behavior in La2CoMnO6 nanoparticles

TL;DR

This study explores the magnetodielectric properties of La2CoMnO6 nanoparticles, revealing significant magnetodielectric effects linked to magnetic transitions and analyzing intrinsic and extrinsic contributions to these effects.

Contribution

It provides new insights into the magnetodielectric behavior of La2CoMnO6 nanoparticles, highlighting the roles of magnetic phases and intrinsic versus extrinsic effects.

Findings

Maximum magnetodielectric response of 10% at 100 kHz under 5T

Two ferromagnetic transitions at 218 K and 135 K

Intrinsic contribution to magnetodielectric effect identified

Abstract

We have investigated magnetic, dielectric and magnetodielectric properties of La2CoMnO6 nanoparticles prepared by sol-gel method. Magnetization measurements revealed two distinct ferromagnetic transitions at 218 K and 135 K that can be assigned to ordered and disordered magnetic phases of the La2CoMnO6 nanoparticles. Two dielectric relaxations culminating around the magnetic transitions were observed with a maximum magnetodielectric response reaching 10% and 8% at the respective relaxation peaks measured at 100 kHz under 5T magnetic field. The dc electrical resistivity followed an insulating behavior and showed a negative magnetoresistance; there was no noticeable anomaly in resistivity or magnetoresistance near the magnetic ordering temperatures. Complex impedance analysis revealed a clear intrinsic contribution to the magnetodielectric response; however, extrinsic contribution due to Maxwell-Wagner effect combined with magnetoresistance property dominated the magnetodielectric effect at high temperatures.