Coexisting ferroelectric and magnetic morphotropic phase boundaries in Dy-modified BiFeO3-PbTiO3 multiferroics
Abstract
Morphotropic phase boundary (MPB) in ferroelectric solid solutions can significantly enhance the dielectric and piezoelectric performances of the materials. Similarly, magnetic MPB has been found to exist in a few ferromagnets and is proved to be greatly beneficial to the magnetostrictive response. In this letter, we report the finding of a magnetic MPB in the multiferroic 0.66Bi1−xDyxFeO3-0.34PbTiO3 system, which overlaps the structural MPB of ferroelectric phases. A (weak) ferromagnetic state is induced at room temperature by Dy for the rhombohedral compositions with x ≥ 0.10. Upon cooling down from room temperature, the tetragonal compositions (x ≤ 0.05) show only one magnetic phase transition from the paramagnetic to antiferromagnetic phase, while the rhombohedral compositions exhibit a series of magnetic phase transitions from the (weak) ferromagnetic state to an antiferromagnetic order then to another weak ferromagnetic phase. A magneto-structural phase diagram has been established that reveals the presence of a magnetic MPB and a ferroelectric MPB. More significantly, the ferroelectric and magnetic MPB regions are found to overlap with each other, pointing to interesting kinds of multiferroic couplings.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Nov 02, 2015
- Source ID
- 10.1063/1.4935097
Entities
People
- Alexei A Bokov
- Hua Wu
- Jian Zhuang
- Lun-wei Su
- Ming Liu
- Wei Ren
- Zuo-Guang Ye
Organizations
- Donghua University
- National Natural Science Foundation of China
- Natural Sciences and Engineering Research Council
- Office of Naval Research Global
- Simon Fraser University
- Xi'an Jiaotong University