TY - JOUR
T1 - Strain control of phase transition and magnetic property in multiferroic BiFeO3 thin films
AU - Zheng, Wanchao
AU - Zheng, Dongxing
AU - Li, Dong
AU - Li, Peng
AU - Zhang, Linxing
AU - Gong, Junlu
AU - Pang, Xin
AU - Jin, Chao
AU - Zhang, Xixiang
AU - Bai, Haili
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): CRF-2015-SENSORS-2709
Acknowledgements: H.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.
PY - 2019/12/9
Y1 - 2019/12/9
N2 - BiFeO3 (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.
AB - BiFeO3 (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.
UR - http://hdl.handle.net/10754/660918
UR - https://linkinghub.elsevier.com/retrieve/pii/S0040609019307667
UR - http://www.scopus.com/inward/record.url?scp=85076843256&partnerID=8YFLogxK
U2 - 10.1016/j.tsf.2019.137741
DO - 10.1016/j.tsf.2019.137741
M3 - Article
SN - 0040-6090
VL - 695
SP - 137741
JO - Thin Solid Films
JF - Thin Solid Films
ER -