Abstract
We investigated the effects of Mn doping on the crystal structure, phonon vibration, and magnetic properties of Bi0.88Sm0.12FeO3 ceramics. Mn doping effectively modified the rhombohedral symmetry and induced a structural transition from an R3c rhombohedral to Pnam orthorhombic structure. Magnetic measurements revealed a weak ferromagnetic behavior, which was related to the canted antiferromagnetic order of the Pnam structure. The cycloidal spin structure of the R3c phase could not be suppressed by substitution of Mn at the Fe site. Studies on the self-phase transition and electric field-induced structural transition revealed many changes in coercivity and remanent magnetization, which are believed to originate from the R3c/Pnam phase switching along with spin frustration. Observations of the field step-dependent hysteresis loop and the ferromagnetic-like hysteresis loop after poling in an electric field provided direct evidence of phase boundary (PB) ferromagnetism and magnetic coupling at the PB.
Highlights
IntroductionPaper ferroelectric/ferromagnetic properties of Mn doping on Bi1ÀySmyFeO3 compounds
The coexistence of energetically equivalent phases has recently received much interest in relation to BiFeO3-based multiferroics.[1,2,3] The coexistence of phases with differences in lattice strain, magnetic anisotropy, and antiferroelectric orderings o en offers extraordinary properties such as high electromechanical response, double and pinched ferroelectric hysteresis loops,[4,5] vertical magnetic hysteresis loop shi,[6,7,8] and the self-change of magnetization with time.[9]
It is accepted that Bi1ÀySmyFeO3 mother compounds show coexistence of the R3c rhombohedral and PbZrO3-type orthorhombic structures in the composition range of 0.1 # y < 0.14.29,30 in the present paper, we investigate the crystal structure and magnetic properties of Bi0.88Sm0.12Fe1ÀxMnxO3 (0.02 # x # 0.1) compounds at the polymorphs of the polar R3c rhombohedral and antipolar Pnam orthorhombic structures
Summary
Paper ferroelectric/ferromagnetic properties of Mn doping on Bi1ÀySmyFeO3 compounds. Zhou et al reported the crystal structure and multiferroic properties of Bi1ÀySmyFe0.95Mn0.05O3 (y 1⁄4 0.08 and 0.16) ceramics.[27] Pandey et al studied the structural evolution of Bi1ÀySmyFe1ÀyMnyO3 (0 # y # 0.15) compounds and observed maximum magnetization at the PB, where the percentage of two phases has a comparable value.[25] these investigations do not answer the question of how Mn can induce structure transition and whether the existence of two structural phases can enhance ferroelectric/ferromagnetic properties in the vicinity of an MPB. It is accepted that Bi1ÀySmyFeO3 mother compounds show coexistence of the R3c rhombohedral and PbZrO3-type orthorhombic structures in the composition range of 0.1 # y < 0.14.29,30 in the present paper, we investigate the crystal structure and magnetic properties of Bi0.88Sm0.12Fe1ÀxMnxO3 (0.02 # x # 0.1) compounds at the polymorphs of the polar R3c rhombohedral and antipolar Pnam orthorhombic structures. Through the electric eld-induced structural transition, we showed evidence of contribution of PB ferromagnetism to the magnetic properties of Bi0.88Sm0.12Fe1ÀxMnxO3 ceramic compounds
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