Epitaxial films of Bi7 Mn3.75 Ti2.25 O21 were prepared to yield a previously unsynthesized material. The superlattice phase is produced by incorporating the magnetoelectric BiMn O3 into the perovskite substructure of the ferroelectric Bi4 Ti3 O12, a strategy which is hoped to yield previously undiscovered multiferroic materials. X-ray diffraction and transmission electron microscopy (TEM) confirm synthesis of an epitaxial n=6 Aurivillius phase. Magnetization measurements show ferromagnetic behavior with a Curie point of 55 K, but electronic polarization measurements show no remanent polarization. Rutherford backscattering spectrometry indicates a channeling minimum min of 22%, consistent with the high density of out-of-phase domain boundaries observed by TEM.
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)