Magnetodielectric behavior in La2CoMnO6 nanoparticles

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.

15 pages

References in corpus (3)

• Magnetodielectric effect without multiferroic coupling
• Colossal dielectric constants in transition-metal oxides
• Influence of lattice distortion on the Curie temperature and spin-phonon coupling in LaMn${}_{0.5}$Co${}_{0.5}$O${}_3$

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• Giant magnetostriction in La2CoMnO6 synthesized by microwave irradiation
• Magnetodielectric Properties in Two Dimensional Magnetic Insulators
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