Negative magnetostrictive magnetoelectric coupling of BiFeO3
Sanghyun Lee, M. T. Fernandez-Diaz, H. Kimura, Y. Noda, D. T. Adroja,, Seongsu Lee, Junghwan Park, V. Kiryukhin, S-W. Cheong, M. Mostovoy, and, Je-Geun Park
TL;DR
This study uses high-resolution neutron diffraction to reveal that in BiFeO3, magnetostrictive effects suppress electric polarization at Fe sites below the Néel temperature, demonstrating a negative magnetoelectric coupling.
Contribution
It provides the first microscopic evidence of negative magnetoelectric coupling in BiFeO3 due to magnetostriction, clarifying the underlying mechanism.
Findings
Magnetostrictive coupling suppresses electric polarization at Fe sites below TN
Negative magnetoelectric coupling outweighs spin current effects
High-resolution neutron diffraction effectively probes microscopic interactions
Abstract
How the magnetoelectric coupling actually occurs on a microscopic level in multiferroic BiFeO3 is not well known. By using the high-resolution single crystal neutron diffraction techniques, we have determined the electric polarization of each individual elements of BiFeO3, and concluded that the magnetostrictive coupling suppresses the electric polarization at the Fe site below TN. This negative magnetoelectric coupling appears to outweigh the spin current contributions arising from the cycloid spin structure, which should produce a positive magnetoelectric coupling.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.