Antiferromagnetic transitions in tetragonal-like BiFeO 3

G. J. MacDougall, H. M. Christen, W. Siemons, M. D. Biegalski, J. L. Zarestky, S. Liang, E. Dagotto, S. E. Nagler

Research output: Contribution to journalArticlepeer-review

Abstract

Recent studies have reported the existence of an epitaxially stabilized tetragonal-like ("T-like") monoclinic phase in BiFeO 3 thin films with high levels of compressive strain. While their structural and ferroelectric properties are different from those of rhombohedral-like ("R-like") films with lower levels of strain, little information exists on magnetic properties. Here, we report on a detailed neutron scattering study of a nearly phase-pure film of T-like BiFeO 3. By tracking the temperature dependence and relative intensity of several superstructure peaks in the reciprocal lattice cell, we confirm antiferromagnetism with largely G-type character and T N=324 K, significantly below a structural phase transition at 375 K, contrary to previous reports. Evidence for a second transition, possibly a minority magnetic phase with C-type character, is also reported with T N=260 K. The coexistence of the two magnetic phases in T-like BiFeO 3 and the difference in ordering temperatures between R-like and T-like systems is explained through simple Fe-O-Fe bond distance considerations.

Original languageEnglish (US)
Article number100406
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume85
Issue number10
DOIs
StatePublished - Mar 20 2012
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'Antiferromagnetic transitions in tetragonal-like BiFeO <sub>3</sub>'. Together they form a unique fingerprint.

Cite this