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Phase transition and enhanced magneto-dielectric response in BiFeO3-DyMnO3 multiferroics

Phase transition and enhanced magneto-dielectric response in BiFeO3-DyMnO3 multiferroics

Authors :
K. K. Mishra
Dillip K. Pradhan
Shrabanee Sen
Satya Narayan Tripathy
Marian Paulch
Ratnakar Palai
James F. Scott
Ram S. Katiyar
Dhiren K. Pradhan
University of St Andrews. School of Chemistry
University of St Andrews. School of Physics and Astronomy
Source :
Journal of Applied Physics. 117:144103
Publication Year :
2015
Publisher :
AIP Publishing, 2015.

Abstract

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). 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. Publisher PDF

Details

ISSN :
10897550 and 00218979
Volume :
117
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi.dedup.....bdfa12857e8575b61d7e0c1a463475b4
Full Text :
https://doi.org/10.1063/1.4916927