Phase transition and enhanced magneto-dielectric response in BiFeO3-DyMnO3 multiferroics
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We report systematic studies on crystal structure and magneto-dielectric properties of (1 − x) BiFeO3-x DyMnO3 (0.0 ≤ x ≤ 0.2) nanoceramics synthesized by auto-combustion method. Rietveld refinement of X-ray diffraction data indicates a structural transition from R3c to R3c + Pn21a at x = 0.1. Field emission scanning electron micrographs display a decrease in grain size with increase in x. The presence of dielectric anomalies around antiferromagnetic transition temperature implies the magnetoelectric coupling. Dielectric measurements showed decrease in magnetic ordering temperature with increasing x in agreement with differential scanning calorimetry results. A significant increase in magnetization has been found with increasing DyMnO3 substitution. Magneto-impedance spectroscopy reveals a significant change (∼18%) in dielectricpermittivity at H = 2 T for x = 0.2.
Tripathy , S N , Pradhan , D K , Mishra , K K , Sen , S , Palai , R , Paulch , M , Scott , J F , Katiyar , R S & Pradhan , D K 2015 , ' Phase transition and enhanced magneto-dielectric response in BiFeO 3 -DyMnO 3 multiferroics ' Journal of Applied Physics , vol 117 , no. 14 , 144103 . DOI: 10.1063/1.4916927
Journal of Applied Physics
© 2015 AIP Publishing LLC. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at https://dx.doi.org/10.1063/1.4916927
This work is partially supported by DST fast track Project No. SR/FTP/PS-16/2009. Dhiren K. Pradhan acknowledges IFN (NSF Grant No. EPS—01002410) for fellowship. The work at UPR was supported by National Science Foundation (NSF DMR 1410869) and Institute for Functional Nanomaterials (IFN).