New multiferroics based on EuxSr1-xTiO3 nanotubes and nanowires

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

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
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.