Phase transition and enhanced magneto-dielectric response in BiFeO3-DyMnO3 multiferroics
Abstract
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.
Citation
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 . https://doi.org/10.1063/1.4916927
Publication
Journal of Applied Physics
Status
Peer reviewed
ISSN
0021-8979Type
Journal article
Description
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).Collections
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