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Graf M, Aramberri H, Zubko P, Íñiguez J. Giant voltage amplification from electrostatically induced incipient ferroelectric states. NATURE MATERIALS 2022; 21:1252-1257. [PMID: 36008605 PMCID: PMC9622417 DOI: 10.1038/s41563-022-01332-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 07/12/2022] [Indexed: 06/15/2023]
Abstract
Ferroelectrics subject to suitable electric boundary conditions present a steady negative capacitance response1,2. When the ferroelectric is in a heterostructure, this behaviour yields a voltage amplification in the other elements, which experience a potential difference larger than the one applied, holding promise for low-power electronics3. So far research has focused on verifying this effect and little is known about how to optimize it. Here, we describe an electrostatic theory of ferroelectric/dielectric superlattices, convenient model systems4,5, and show the relationship between the negative permittivity of the ferroelectric layers and the voltage amplification in the dielectric ones. Then, we run simulations of PbTiO3/SrTiO3 superlattices to reveal the factors most strongly affecting the amplification. In particular, we find that giant effects (up to tenfold increases) can be obtained when PbTiO3 is brought close to the so-called 'incipient ferroelectric' state.
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Affiliation(s)
- Mónica Graf
- Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST), Esch/Alzette, Luxembourg
| | - Hugo Aramberri
- Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST), Esch/Alzette, Luxembourg
| | - Pavlo Zubko
- London Centre for Nanotechnology and Department of Physics and Astronomy, University College London, London, UK
| | - Jorge Íñiguez
- Materials Research and Technology Department, Luxembourg Institute of Science and Technology (LIST), Esch/Alzette, Luxembourg.
- Department of Physics and Materials Science, University of Luxembourg, Belvaux, Luxembourg.
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Bakaul SR, Prokhorenko S, Zhang Q, Nahas Y, Hu Y, Petford-Long A, Bellaiche L, Valanoor N. Freestanding Ferroelectric Bubble Domains. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2105432. [PMID: 34541726 DOI: 10.1002/adma.202105432] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 08/17/2021] [Indexed: 06/13/2023]
Abstract
Bubble-like domains, typically a precursor to the electrical skyrmions, arise in ultrathin complex oxide ferroelectric-dielectric-ferroelectric heterostructures epitaxially clamped with flat substrates. Here, it is reported that these specially ordered electric dipoles can also be retained in a freestanding state despite the presence of inhomogeneously distributed structural ripples. By probing local piezo and capacitive responses and using atomistic simulations, this study analyzes these ripples, sheds light on how the bubbles are stabilized in the modified electromechanical energy landscape, and discusses the difference in morphology between bubbles in freestanding and as-grown states. These results are anticipated to be the starting point of a new paradigm for the exploration of electric skyrmions with arbitrary boundaries and physically flexible topological orders in ferroelectric curvilinear space.
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Affiliation(s)
- Saidur R Bakaul
- Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Sergei Prokhorenko
- Physics Department and Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, AR, 72701, USA
| | - Qi Zhang
- School of Materials Science and Engineering, The University of New South Wales, Sydney, New South Wales, 2052, Australia
| | - Yousra Nahas
- Physics Department and Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, AR, 72701, USA
| | - Yushi Hu
- Department of Computer Science, University of Chicago, 5730 S Ellis Ave, Chicago, IL, 60637, USA
| | - Amanda Petford-Long
- Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Laurent Bellaiche
- Physics Department and Institute for Nanoscience and Engineering, University of Arkansas, Fayetteville, AR, 72701, USA
| | - Nagarajan Valanoor
- School of Materials Science and Engineering, The University of New South Wales, Sydney, New South Wales, 2052, Australia
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Negative capacitance in multidomain ferroelectric superlattices. Nature 2016; 534:524-8. [DOI: 10.1038/nature17659] [Citation(s) in RCA: 225] [Impact Index Per Article: 28.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Accepted: 03/08/2016] [Indexed: 11/08/2022]
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Li B, Wang JB, Zhong XL, Wang F, Zeng YK, Zhou YC. Giant electrocaloric effects in ferroelectric nanostructures with vortex domain structures. RSC Adv 2013. [DOI: 10.1039/c3ra41252k] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
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