Antiferromagnetic transitions in `T-like' BiFeO3

Abstract

Recent studies have reported the existence of an epitaxially-stabilized tetragonal-like ('T-like') monoclinic phase in BiFeO3 thin-films with high levels of compressive strain. While their structural and ferroelectric properties are different than those of rhombohedral-like ('R-like') films with lower levels of strain, little information exists on magnetic properties. Here, we report a detailed neutron scattering study of a nearly phase-pure film of T-like BiFeO3. 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 TN = 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 TN = 260 K. The co-existence of the two magnetic phases in T-like BiFeO3 and the difference in ordering temperatures between R-like and T-like systems is explained through simple Fe-O-Fe bond distance considerations.

9 pages, 7 figures. Slight modifications to introductory text and presentation of data. Supplementary Material section added

References in corpus (10)

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Cited by in corpus (7)

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• Structure and spin dynamics of multiferroric BiFeO${}_3$
• Phase transition close to room temperature in BiFeO3 thin films
• Strain engineering magnetic frustration in perovskite oxide thin films
• Periodic elastic nanodomains in ultrathin tetrogonal-like BiFeO3 films
• Giant Thermal Enhancement of the Electric Polarization in Ferrimagnetic BiFe${}_{1-x}$Co${}_x$O${}_3$ Solid Solutions Near Room Temperature
• The Magnetoelastic Distortion of Multiferroic BiFeO${}_3$ in the Canted Antiferromagnetic State