New multiferroics based on EuxSr1-xTiO3 nanotubes and nanowires

Victoria V. Khist,
Chan-Woo Lee,
Chaitanya S. Deo,
Rakesh K. Behera,
Anna N. Morozovska

Інститут проблем матеріалознавства ім. І. М. Францевича НАН України , вул. Кржижановського 3, Київ, 03142, Україна
Journal of Applied Physics - Melville, USA: American Institute of Physics, 2013, #113


Using Landau-Ginzburg-Devonshire theory, we have addressed the complex interplay between structural antiferrodistortive order parameter (oxygen octahedron rotations), polarization and magnetization in EuxSr1-xTiO3 nanosystems. We have calculated the phase diagrams of EuxSr1-xTiO3 bulk, nanotubes and nanowires, which include the antiferrodistortive, ferroelectric, ferromagnetic, and antiferromagnetic phases. For EuxSr1-xTiO3 nanosystems, our calculations show the presence of antiferrodistortive-ferroelectric-ferromagnetic phase or the triple phase at low temperatures (≤10 K). The polarization and magnetization values in the triple phase are calculated to be relatively high (∼50 μC/cm2 and ∼0.5 MA/m). Therefore, the strong coupling between structural distortions, polarization, and magnetization suggests the EuxSr1-xTiO3 nanosystems as strong candidates for possible multiferroic applications.