Multiferroic BaTiO3-CoFe2O4Nanostructures

作者：Zheng, H.; Wang, J.; Lofland, S.E.; Ma, Z.; Mohaddes-Ardabili, L.; Zhao, T.; Salamanca-Riba, L.; Shinde, S.R.; Ogale, S.B.; Bai, F.; Viehland, D.; Jia, Y.; Schlom, D.G.; Wuttig, M.; Roytburd, A.; Ramesh, R.

来源：Science, 2004, 303(5658): 661-663.

DOI：10.1126/science.1094207

• Magnetic order

We report on the coupling between ferroelectric and magnetic order parameters in a nanostructured BaTiO3-CoFe2O4ferroelectromagnet. This facilitates the interconversion of energies stored in electric and magnetic fields and plays an important role in many devices, including transducers, field sensors, etc. Such nanostructures were deposited on single-crystal SrTiO3(001) substrates by pulsed laser deposition from a single Ba-Ti-Co-Fe-oxide target. The films are epitaxial in-plane as well as out-of-plane with self-assembled hexagonal arrays of CoFe 2O4nanopillars embedded in a BaTiO3matrix. The CoFe2O4nanopillars have uniform size and average spacing of 20 to 30 nanometers. Temperature-dependent magnetic measurements illustrate the coupling between the two order parameters, which is manifested as a change in magnetization at the ferroelectric Curie temperature. Thermodynamic analyses show that the magnetoelectric coupling in such a nanostructure can be understood on the basis of the strong elastic interactions between the two phases.

• 出版日期2004-1-30
• 单位pennsylvania State University; Rowan University; 美国弗吉尼亚理工大学(Virginia Tech); University of Maryland; The Pennsylvania State University; The University of Maryland