Rotomagnetic coupling in fine grained multiferroic BiFeO3: Theory and experiment

Abstract

Using Landau-Ginzburg-Devonshire (LGD) theory for BiFeO3 dense fine grained ceramics with quasi spherical grains and nanosized inter grain spaces enriched by elastic defects, we calculated a surprisingly strong size-induced increase of the AFM temperature caused by the joint action of rotomagnetic and magnetostrictive coupling. Notably that all parameters included in the LGD functional have been extracted from experiments, not assumed. Complementary we performed experiments for dense BiFeO3 ceramics, which revealed that the shift of antiferromagnetic transition to 690 K instead of 645 K for a single crystal. To explain theoretically the result, we consider the possibility to control antiferromagnetic state of multiferroic BiFeO3 via biquadratic antiferrodistortive rotomagnetic, rotoelectric, magnetostrictive and magnetoelectric couplings. According to our calculations the highest is the rotostriction contribution, the magnetostrictive and electrostriction contributions appeared smaller.

arXiv comment27 pages, 5 figures in the main text and 6 figures in the supplement

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Cited by in corpus (4)

• Exploring physics of ferroelectric domain walls via Bayesian analysis of atomically resolved STEM data
• Mapping gradient-driven morphological phase transition at the conductive domain walls of strained multiferroic films
• Melting of Spatially Modulated Phases in La-doped BiFeO3 at Surfaces and Surface-Domain Wall Junctions
• Stability and low-energy orientations of interphase boundaries in multiaxial ferroelectrics: Phase-field simulations