Ferroelectric Self-Polarization Controlled Magnetic Stratification and Magnetic Coupling in Ultrathin La0.67Sr0.33MnO3 Films
Abstract
Multiferroic oxide heterostructures consisting of ferromagnetic and ferroelectric components hold the promise for nonvolatile magnetic control via ferroelectric polarization, advantageous for the low-dissipation spintronics. Modern understanding of the magnetoelectric coupling in these systems involves structural, orbital, and magnetic reconstructions at interfaces. Previous works have long proposed polarization-dependent interfacial magnetic structures; however, direct evidence is still missing, which requires advanced characterization tools with near-atomic-scale spatial resolutions. Here, extensive polarized neutron reflectometry (PNR) studies have determined the magnetic depth profiles of PbZr0.2Ti0.8O3/La0.67Sr0.33MnO3 (PZT/LSMO) bilayers with opposite self-polarizations. When the LSMO is 2–3 nm thick, the bilayers show two magnetic transitions on cooling. However, temperature-dependent magnetization is different below the lower-temperature transition for opposite polarizations. PNR finds that the LSMO splits into two magnetic sublayers, but the inter-sublayer magnetic couplings are of opposite signs for the two polarizations. Near-edge X-ray absorption spectroscopy further shows contrasts in both the Mn valences and the Mn–O bond anisotropy between the two polarizations. Finally, this work completes the puzzle for the magnetoelectric coupling model at the PZT/LSMO interface, showing a synergic interplay among multiple degrees of freedom toward emergent functionalities at complex oxide interfaces.
- Authors:
-
[1];
[2];
[2];
[2];
[5];
[5];
[5]
- National Univ. of Singapore (Singapore); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sun Yat-Sen Univ., Guangzhou (China)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- National Univ. of Singapore (Singapore)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Singapore Ministry of Education Academic Research Fund
- OSTI Identifier:
- 1807264
- Alternate Identifier(s):
- OSTI ID: 1838927
- Grant/Contract Number:
- AC05-00OR22725; AC02-06CH11357; R-84-000-196-114
- Resource Type:
- Accepted Manuscript
- Journal Name:
- ACS Applied Materials and Interfaces
- Additional Journal Information:
- Journal Volume: 13; Journal Issue: 25; Journal ID: ISSN 1944-8244
- Publisher:
- American Chemical Society (ACS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; magnetoelectric coupling; interlayer coupling; two magnetic transitions; polarization reversal; flexoelectric effect
Citation Formats
Liu, Chao, Liu, Yaohua, Zhang, Bangmin, Sun, Cheng-Jun, Lan, Da, Chen, Pingfan, Wu, Xiaohan, Yang, Ping, Yu, Xiaojiang, Charlton, Timothy, Fitzsimmons, Michael R., Ding, Jun, Chen, Jingsheng, and Chow, Gan Moog. Ferroelectric Self-Polarization Controlled Magnetic Stratification and Magnetic Coupling in Ultrathin La0.67Sr0.33MnO3 Films. United States: N. p., 2021.
Web. doi:10.1021/acsami.1c02300.
Liu, Chao, Liu, Yaohua, Zhang, Bangmin, Sun, Cheng-Jun, Lan, Da, Chen, Pingfan, Wu, Xiaohan, Yang, Ping, Yu, Xiaojiang, Charlton, Timothy, Fitzsimmons, Michael R., Ding, Jun, Chen, Jingsheng, & Chow, Gan Moog. Ferroelectric Self-Polarization Controlled Magnetic Stratification and Magnetic Coupling in Ultrathin La0.67Sr0.33MnO3 Films. United States. https://doi.org/10.1021/acsami.1c02300
Liu, Chao, Liu, Yaohua, Zhang, Bangmin, Sun, Cheng-Jun, Lan, Da, Chen, Pingfan, Wu, Xiaohan, Yang, Ping, Yu, Xiaojiang, Charlton, Timothy, Fitzsimmons, Michael R., Ding, Jun, Chen, Jingsheng, and Chow, Gan Moog. Thu .
"Ferroelectric Self-Polarization Controlled Magnetic Stratification and Magnetic Coupling in Ultrathin La0.67Sr0.33MnO3 Films". United States. https://doi.org/10.1021/acsami.1c02300. https://www.osti.gov/servlets/purl/1807264.
@article{osti_1807264,
title = {Ferroelectric Self-Polarization Controlled Magnetic Stratification and Magnetic Coupling in Ultrathin La0.67Sr0.33MnO3 Films},
author = {Liu, Chao and Liu, Yaohua and Zhang, Bangmin and Sun, Cheng-Jun and Lan, Da and Chen, Pingfan and Wu, Xiaohan and Yang, Ping and Yu, Xiaojiang and Charlton, Timothy and Fitzsimmons, Michael R. and Ding, Jun and Chen, Jingsheng and Chow, Gan Moog},
abstractNote = {Multiferroic oxide heterostructures consisting of ferromagnetic and ferroelectric components hold the promise for nonvolatile magnetic control via ferroelectric polarization, advantageous for the low-dissipation spintronics. Modern understanding of the magnetoelectric coupling in these systems involves structural, orbital, and magnetic reconstructions at interfaces. Previous works have long proposed polarization-dependent interfacial magnetic structures; however, direct evidence is still missing, which requires advanced characterization tools with near-atomic-scale spatial resolutions. Here, extensive polarized neutron reflectometry (PNR) studies have determined the magnetic depth profiles of PbZr0.2Ti0.8O3/La0.67Sr0.33MnO3 (PZT/LSMO) bilayers with opposite self-polarizations. When the LSMO is 2–3 nm thick, the bilayers show two magnetic transitions on cooling. However, temperature-dependent magnetization is different below the lower-temperature transition for opposite polarizations. PNR finds that the LSMO splits into two magnetic sublayers, but the inter-sublayer magnetic couplings are of opposite signs for the two polarizations. Near-edge X-ray absorption spectroscopy further shows contrasts in both the Mn valences and the Mn–O bond anisotropy between the two polarizations. Finally, this work completes the puzzle for the magnetoelectric coupling model at the PZT/LSMO interface, showing a synergic interplay among multiple degrees of freedom toward emergent functionalities at complex oxide interfaces.},
doi = {10.1021/acsami.1c02300},
journal = {ACS Applied Materials and Interfaces},
number = 25,
volume = 13,
place = {United States},
year = {Thu Jun 17 00:00:00 EDT 2021},
month = {Thu Jun 17 00:00:00 EDT 2021}
}
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