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Ferromagnetism and magnetodielectric effect in insulating LaBiMn4∕3Co2∕3O6 thin films

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 superexchange 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. These results are explained using the Raman spectroscopic studies indicating a weak spin-lattice interaction around this magnetic transition. A.K.K. thanks the French Ministry of Education and Research for a fellowship award. This work was carried out in the frame of the NoE FAME (FP6-5001159-1), the STREP MaCoMuFi (NMP3-CT-2006-033221), and the STREP CoMePhS (NMP4-CT-2005-517039) supported by the European Community and by the CNRS, France. Partial support from the ANR (NT05-1-45177 and NT05-3-41793) is also acknowledged. The authors would also like to acknowledge Dr. L. Mechin and Mr. C. Fur for their help in the experiments and W.C. Sheets, M. Maglione, and J.F. Scott for careful reading of the manuscript.
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Submitted on : Thursday, January 27, 2022 - 9:51:15 AM
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R. Ranjith, Asish Kundu, M. Filippi, B. Kundys, Wilfrid Prellier, et al.. Ferromagnetism and magnetodielectric effect in insulating LaBiMn4∕3Co2∕3O6 thin films. Applied Physics Letters, American Institute of Physics, 2008, 92 (6), pp.062909. ⟨10.1063/1.2842409⟩. ⟨hal-03545136⟩

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