Emergent multiferroism with magnetodielectric coupling in EuTiO3 created by a negative pressure control of strong spin-phonon coupling.
Nature Publishing Group UK
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Zhao, R., Yang, C., Wang, H., Jiang, K., Wu, H., Shen, S., Wang, L., et al. (2022). Emergent multiferroism with magnetodielectric coupling in EuTiO3 created by a negative pressure control of strong spin-phonon coupling.. Nat Commun, 13 (1) https://doi.org/10.1038/s41467-022-30074-4
Negative pressure has emerged as a powerful tool to tailor the physical properties of functional materials. However, a negative pressure control of spin-phonon coupling for engineering magnetism and multiferroicity has not been explored to date. Here, using uniform three-dimensional strain-induced negative pressure in nanocomposite films of (EuTiO3)0.5:(MgO)0.5, we demonstrate an emergent multiferroicity with magnetodielectric coupling in EuTiO3, matching exactly with density functional theory calculations. Density functional theory calculations are further used to explore the underlying physics of antiferromagnetic-paraelectric to ferromagnetic-ferroelectric phase transitions, the spin-phonon coupling, and its correlation with negative pressures. The observation of magnetodielectric coupling in the EuTiO3 reveals that an enhanced spin-phonon coupling originates from a negative pressure induced by uniform three-dimensional strain. Our work provides a route to creating multiferroicity and magnetoelectric coupling in single-phase oxides using a negative pressure approach.
Article, /639/301/119/996, /639/766/119/996, /639/766/119/997, /120, /128, /147/137, /145, /119, /147/143, article
External DOI: https://doi.org/10.1038/s41467-022-30074-4
This record's URL: https://www.repository.cam.ac.uk/handle/1810/336691