Ferromagnetism and magneto-dielectric effect in insulating LaBiMn4/3Co2/3O6 thin films

TL;DR

This study reports the fabrication and characterization of LaBiMn4/3Co2/3O6 thin films, revealing ferromagnetism, magnetic anisotropy, and magneto-dielectric coupling near 130K, with insights into spin-lattice interactions.

Contribution

It demonstrates the synthesis of high-quality epitaxial LaBiMn4/3Co2/3O6 films and uncovers their magnetic and dielectric coupling properties.

Findings

Ferromagnetic behavior with magnetic anisotropy observed.

Dielectric anomaly at 130K indicating magneto-dielectric coupling.

Weak spin-lattice interaction around magnetic transition.

Abstract

High quality epitaxial thin films of LaBiMn4/3Co2/3O6 perovskite were fabricated on (001)-oriented SrTiO3 and LaAlO3 substrates by the pulsed laser deposition technique. Magnetization measurements reveal a strong magnetic anisotropy and a ferromagnetic behavior that is in agreement with a super-exchange interaction between Mn4+ and Co2+ ions, which are randomly distributed in the B-site. A distinct anomaly is observed in the dielectric measurements at 130K corresponding to the onset of the magnetic ordering, suggesting a coupling. Above this temperature, the extrinsic Maxwell-Wagner effect is dominating. Theses results are explained using the Raman spectroscopic studies indicating a weak spin-lattice interaction around this magnetic transition.