Spin phonon interactions and magnetodielectric effects in multiferroic BiFeO3–PbTiO3

Rajesh Katoch, C Dhana Sekhar, Venimadhav Adyam, James F Scott, Rajeev Gupta, Ashish Garg

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)

Abstract

Here, we report the observation of magneto-dielectric and magneto-structural coupling in (1  −   x )BiFeO3–x PbTiO3 i.e.(1  −   x )BF– x PT) solid solutions with compositions in the vicinity of morphotropic phase boundary, as manifested by a combination of temperature dependent magnetic, Raman and dielectric measurements. Whilst x-ray diffraction and Raman spectroscopy suggest absence of any structural phase transition between 90–300 K, temperature dependent magnetic studies reveal magnetic anomalies in the solid solutions. These results are complemented by identical observations in the dielectric measurements at similar temperatures indicating a coupling between magnetic and electric order parameters. Further, Raman studies on rhombohedral i.e. x   =  0.20 samples reveal a coupling between the magnetic structure and the lattice, causing spin-phonon interactions that are possibly responsible for observed magneto-dielectric effects. Our results illustrate that the phase transitions in BiFeO3–PbTiO3 system are fewer than expected and are attributed to a spatial averaging in an inhomogeneous albeit single-phase material due to clustering of Fe- or Ti-ions on different length scales.
Original languageEnglish
Article number075901
Pages (from-to)1-11
Number of pages11
JournalJournal of Physics: Condensed Matter
Volume28
Issue number7
DOIs
Publication statusPublished - 25 Jan 2016

Keywords

  • Multiferroics
  • Magnetodielectric
  • Spin phonon coupling
  • Morphotropic phase boundary

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