Ferroelectric Self-Polarization Controlled Magnetic Stratification and Magnetic Coupling in Ultrathin La0.67Sr0.33MnO3 Films

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

doi:10.1021/acsami.1c02300

Title: Ferroelectric Self-Polarization Controlled Magnetic Stratification and Magnetic Coupling in Ultrathin La_0.67Sr_0.33MnO₃ Films

Journal Article · Thu Jun 17 00:00:00 EDT 2021 · ACS Applied Materials and Interfaces

DOI:https://doi.org/10.1021/acsami.1c02300· OSTI ID:1807264

^[1];

^[2]; Zhang, Bangmin ^[3]; Sun, Cheng-Jun ^[4]; Lan, Da ^[5]; Chen, Pingfan ^[5]; Wu, Xiaohan ^[5]; Yang, Ping ^[5]; Yu, Xiaojiang ^[5];

^[2];

^[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)

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 PbZr_0.2Ti_0.8O₃/La_0.67Sr_0.33MnO₃ (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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Singapore Ministry of Education Academic Research Fund

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357; R-84-000-196-114

OSTI ID:: 1807264

Alternate ID(s):: OSTI ID: 1838927

Journal Information:: ACS Applied Materials and Interfaces, Vol. 13, Issue 25; ISSN 1944-8244

Publisher:: American Chemical Society (ACS)Copyright Statement

Country of Publication:: United States

Language:: English

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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
magnetoelectric coupling
interlayer coupling
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polarization reversal
flexoelectric effect

Title: Ferroelectric Self-Polarization Controlled Magnetic Stratification and Magnetic Coupling in Ultrathin La0.67Sr0.33MnO3 Films

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Title: Ferroelectric Self-Polarization Controlled Magnetic Stratification and Magnetic Coupling in Ultrathin La_0.67Sr_0.33MnO₃ Films