Strain control of phase transition and magnetic property in multiferroic BiFeO3 thin films
KAUST DepartmentMaterial Science and Engineering Program
Physical Science and Engineering (PSE) Division
KAUST Grant NumberCRF-2015-SENSORS-2709
Online Publication Date2019-12-09
Print Publication Date2020-02
Embargo End Date2021-12-09
Permanent link to this recordhttp://hdl.handle.net/10754/660918
MetadataShow full item record
AbstractBiFeO3 (BFO), a room-temperature antiferromagnetic-ferroelectric multiferroic, is widely researched due to its potential applications for electric-field control of the magnetism. In this work, the strain control of the phase transition and magnetic properties in the BFO/LaAlO3 heterostructures were investigated. The O K edge polarization-dependent X-ray absorption spectroscopy (XAS) spectra show that the Fe 3d level splits into five levels, which proves that the FeO5 pyramid is asymmetric in the highly strained tetragonal-like BFO. The spin canting induced by the asymmetric structure leads to the magnetic moment. Thus, an obvious magnetic signal in the 17-nm-thick BFO thin films was observed by the Quantum Design magnetic property measurement system. With the increase of the BFO film thickness, the clamping effect induced by the substrate becomes weak, further leading to the BFO phase transition. The O K edge polarization-dependent XAS spectra demonstrate that the orbital reconstruction exists at the mixed BFO phase boundaries. Since the orbital reconstructions can induce the strong magnetic coupling, the magnetic order of the different BFO phases will be coupled with each other. It causes a variation of the magnetic property at the phase boundaries or in the BFO phases.
CitationZheng, W., Zheng, D., Li, D., Li, P., Zhang, L., Gong, J., … Bai, H. (2020). Strain control of phase transition and magnetic property in multiferroic BiFeO3 thin films. Thin Solid Films, 695, 137741. doi:10.1016/j.tsf.2019.137741
SponsorsH.L.B. was supported by the National Natural Science Foundation of China (51772207 & 11434006). D.X.Z. was supported by the National Natural Science Foundation of China (11704278). P.L. and X.X.Z. acknowledge the financial support from King Abdullah University of Science and Technology (KAUST), Office of Sponsored Research (OSR) under the Award No. CRF-2015-SENSORS-2709 (KAUST). The authors acknowledge Professor Huanhua Wang and Associate Professor Yu Chen for valuable discussions. The authors acknowledge the Beijing Synchrotron Radiation Facility (1W1A and 4B9B beamlines, China), Shanghai Synchrotron Radiation Facility (08U1A beamline, China) and the National Synchrotron Radiation Laboratory (12B-a beamline, China) of the Chinese Academy of Sciences.
JournalThin Solid Films