Emergent multiferroism with magnetodielectric coupling in EuTiO₃ created by a negative pressure control of strong spin-phonon coupling.

ABSTRACT: 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

SUBMITTER: Zhao R 

PROVIDER: S-EPMC9061821 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature