title: Tailoring surface phase transition and magnetic behaviors in BiFeO3 via doping engineering.
abstract: The charge-spin interactions in multiferroic materials (e.g., BiFeO3) have attracted enormous attention due to their high potential for next generation information electronics. However, the weak and deficient manipulation of charge-spin coupling notoriously limits their commercial applications. To tailor the spontaneous charge and the spin orientation synergistically in BiFeO3 (BFO), in this report, the 3d element of Mn doping engineering is employed and unveils the variation of surface phase transition and magnetic behaviors by introducing chemical strain. The spontaneous ferroelectric response and the corresponding domain structures, magnetic behaviors and spin dynamics in Mn-doped BFO ceramics have been investigated systematically. Both the surface phase transition and magnetization were enhanced in BFO via Mn doping. The interaction between the spontaneous polarization charge and magnetic spin reorientation in Mn-doped BFO are discussed in detail. Moreover, our extensive electron paramagnetic resonance (EPR) results demonstrate that the 3d dopant plays a paramount role in the surface phase transition, which provides an alternative route to tune the charge-spin interactions in multiferroic materials.
authors.affiliation: School of Engineering and Applied Sciences, Harvard University, Cambridge, MA. 02138, USA.
authors.forename: Feng
authors.initials: F
authors.lastname: Yan
authors.affiliation: School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, PR China.
authors.forename: Guozhong
authors.initials: G
authors.lastname: Xing
authors.affiliation: School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, PR China.
authors.forename: Rongming
authors.initials: R
authors.lastname: Wang
authors.affiliation: Department of Metallurgical and Materials Engineering, University of Alabama, Tuscaloosa, AL. 35408.
authors.forename: Lin
authors.initials: L
authors.lastname: Li