Structures and electronic properties of domain walls in BiFeO3 thin films

Huyan, Huaixun; Li, Linze; Addiego, Christopher; Gao, Wenpei; Pan, Xiaoqing

doi:10.1093/nsr/nwz101

Title: Structures and electronic properties of domain walls in BiFeO3 thin films

Journal Article · Wed Jul 10 00:00:00 EDT 2019 · National Science Review

DOI:https://doi.org/10.1093/nsr/nwz101· OSTI ID:1562604

Huyan, Huaixun ^[1]; Li, Linze ^[1]; Addiego, Christopher ^[2]; Gao, Wenpei ^[1]; Pan, Xiaoqing ^[3]

Department of Materials Science and Engineering, University of California, Irvine, CA 92697, USA
Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA
Department of Materials Science and Engineering, University of California, Irvine, CA 92697, USA, Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA, Irvine Materials Research Institute, University of California, Irvine, CA 92697, USA

Abstract Domain walls (DWs) in ferroelectrics are atomically sharp and can be created, erased, and reconfigured within the same physical volume of ferroelectric matrix by external electric fields. They possess a myriad of novel properties and functionalities that are absent in the bulk of the domains, and thus could become an essential element in next-generation nanodevices based on ferroelectrics. The knowledge about the structure and properties of ferroelectric DWs not only advances the fundamental understanding of ferroelectrics, but also provides guidance for the design of ferroelectric-based devices. In this article, we provide a review of structures and properties of DWs in one of the most widely studied ferroelectric systems, BiFeO3 thin films. We correlate their conductivity and photovoltaic properties to the atomic-scale structure and dynamic behaviors of DWs.

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Research Organization:: Univ. of California, Irvine, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0014430

OSTI ID:: 1562604

Alternate ID(s):: OSTI ID: 1545176; OSTI ID: 1612196

Journal Information:: National Science Review, Journal Name: National Science Review Vol. 6 Journal Issue: 4; ISSN 2095-5138

Publisher:: Oxford University PressCopyright Statement

Country of Publication:: China

Language:: English

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Cited by: 13 works

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References (79)

Nanoscale Domain Control in Multiferroic BiFeO₃ Thin Films Chu, Y.-H.; Zhan, Q.; Martin, L. W. Advanced Materials, Vol. 18, Issue 17, p. 2307-2311 https://doi.org/10.1002/adma.200601098	journal	September 2006
Tuning of the Depolarization Field and Nanodomain Structure in Ferroelectric Thin Films Lichtensteiger, Céline; Fernandez-Pena, Stéphanie; Weymann, Christian Nano Letters, Vol. 14, Issue 8 https://doi.org/10.1021/nl404734z	journal	July 2014
Giant photovoltaic effect of ferroelectric domain walls in perovskite single crystals Inoue, Ryotaro; Ishikawa, Shotaro; Imura, Ryota Scientific Reports, Vol. 5, Issue 1 https://doi.org/10.1038/srep14741	journal	October 2015
A Strain-Driven Morphotropic Phase Boundary in BiFeO₃ Zeches, R. J.; Rossell, M. D.; Zhang, J. X. Science, Vol. 326, Issue 5955, p. 977-980 https://doi.org/10.1126/science.1177046	journal	November 2009
Multiferroic BiFeO ₃ films: domain structure and polarization dynamics Zavaliche, F.; Yang, S. Y.; Zhao, T. Phase Transitions, Vol. 79, Issue 12 https://doi.org/10.1080/01411590601067144	journal	December 2006
Elastic strain engineering of ferroic oxides Schlom, Darrell G.; Chen, Long-Qing; Fennie, Craig J. MRS Bulletin, Vol. 39, Issue 2 https://doi.org/10.1557/mrs.2014.1	journal	February 2014
Nanoscale Control of Domain Architectures in BiFeO ₃ Thin Films Chu, Ying-Hao; He, Qing; Yang, Chan-Ho Nano Letters, Vol. 9, Issue 4 https://doi.org/10.1021/nl900723j	journal	April 2009
Role of domain walls in the abnormal photovoltaic effect in BiFeO3 Bhatnagar, Akash; Roy Chaudhuri, Ayan; Heon Kim, Young Nature Communications, Vol. 4, Issue 1 https://doi.org/10.1038/ncomms3835	journal	November 2013
Advances in the growth and characterization of magnetic, ferroelectric, and multiferroic oxide thin films Martin, L. W.; Chu, Y. -H.; Ramesh, R. Materials Science and Engineering: R: Reports, Vol. 68, Issue 4-6 https://doi.org/10.1016/j.mser.2010.03.001	journal	May 2010
Surface Space-Charge Layers in Barium Titanate Chynoweth, A. G. Physical Review, Vol. 102, Issue 3 https://doi.org/10.1103/PhysRev.102.705	journal	May 1956
Giant Ferroelectric Polarization Beyond 150 µC/cm ² in BiFeO ₃ Thin Film Yun, Kwi Young; Ricinschi, Dan; Kanashima, Takeshi Japanese Journal of Applied Physics, Vol. 43, Issue No. 5A https://doi.org/10.1143/JJAP.43.L647	journal	April 2004
Conduction at domain walls in oxide multiferroics Seidel, J.; Martin, L. W.; He, Q. Nature Materials, Vol. 8, Issue 3 https://doi.org/10.1038/nmat2373	journal	January 2009
Effect of Epitaxial Strain on the Spontaneous Polarization of Thin Film Ferroelectrics Ederer, Claude; Spaldin, Nicola A. Physical Review Letters, Vol. 95, Issue 25 https://doi.org/10.1103/PhysRevLett.95.257601	journal	December 2005
Effect of biaxial strain on the electrical and magnetic properties of (001) La0.7Sr0.3MnO3 thin films Adamo, C.; Ke, X.; Wang, H. Q. Applied Physics Letters, Vol. 95, Issue 11 https://doi.org/10.1063/1.3213346	journal	September 2009
Anisotropic polarization-induced conductance at a ferroelectric–insulator interface Zhang, Yi; Lu, Haidong; Xie, Lin Nature Nanotechnology, Vol. 13, Issue 12 https://doi.org/10.1038/s41565-018-0259-z	journal	September 2018
Domain patterns in epitaxial rhombohedral ferroelectric films. I. Geometry and experiments Streiffer, S. K.; Parker, C. B.; Romanov, A. E. Journal of Applied Physics, Vol. 83, Issue 5 https://doi.org/10.1063/1.366632	journal	March 1998
Substantial bulk photovoltaic effect enhancement via nanolayering Wang, Fenggong; Young, Steve M.; Zheng, Fan Nature Communications, Vol. 7, Issue 1 https://doi.org/10.1038/ncomms10419	journal	January 2016
Temporary formation of highly conducting domain walls for non-destructive read-out of ferroelectric domain-wall resistance switching memories Jiang, Jun; Bai, Zi Long; Chen, Zhi Hui Nature Materials, Vol. 17, Issue 1 https://doi.org/10.1038/nmat5028	journal	November 2017
Direct Observations of Retention Failure in Ferroelectric Memories Gao, Peng; Nelson, Christopher T.; Jokisaari, Jacob R. Advanced Materials, Vol. 24, Issue 8 https://doi.org/10.1002/adma.201103983	journal	February 2012
Large Scale Two-Dimensional Flux-Closure Domain Arrays in Oxide Multilayers and Their Controlled Growth Liu, Ying; Wang, Yu-Jia; Zhu, Yin-Lian Nano Letters, Vol. 17, Issue 12 https://doi.org/10.1021/acs.nanolett.7b02615	journal	November 2017
Ferroelectric Random Access Memories Ishiwara, Hiroshi Journal of Nanoscience and Nanotechnology, Vol. 12, Issue 10 https://doi.org/10.1166/jnn.2012.6651	journal	October 2012
Domain Control in Multiferroic BiFeO₃ through Substrate Vicinality Chu, Y.-H.; Cruz, M. P.; Yang, C.-H. Advanced Materials, Vol. 19, Issue 18, p. 2662-2666 https://doi.org/10.1002/adma.200602972	journal	September 2007
Nanoscale design of polarization in ultrathin ferroelectric heterostructures De Luca, Gabriele; Strkalj, Nives; Manz, Sebastian Nature Communications, Vol. 8, Issue 1 https://doi.org/10.1038/s41467-017-01620-2	journal	November 2017
Double-tilt in situ TEM holder with ultra-high stability Xu, Mingjie; Dai, Sheng; Blum, Thomas Ultramicroscopy, Vol. 192 https://doi.org/10.1016/j.ultramic.2018.04.010	journal	September 2018
Enhancement of Ferroelectricity in Strained BaTiO₃ Thin Films Choi, K. J.; Biegalski, M.; Li, Y. L. Science, Vol. 306, Issue 5698, p. 1005-1009 https://doi.org/10.1126/science.1103218	journal	November 2004
Domain Wall Roughness in Epitaxial Ferroelectric ${PbZr}_{0.2} {Ti}_{0.8} O_{3}$ Thin Films Paruch, P.; Giamarchi, T.; Triscone, J. -M. Physical Review Letters, Vol. 94, Issue 19 https://doi.org/10.1103/PhysRevLett.94.197601	journal	May 2005
Observation of a periodic array of flux-closure quadrants in strained ferroelectric PbTiO3 films Tang, Y. L.; Zhu, Y. L.; Ma, X. L. Science, Vol. 348, Issue 6234 https://doi.org/10.1126/science.1259869	journal	April 2015
Exploring Topological Defects in Epitaxial BiFeO ₃ Thin Films Vasudevan, Rama K.; Chen, Yi-Chun; Tai, Hsiang-Hua ACS Nano, Vol. 5, Issue 2 https://doi.org/10.1021/nn102099z	journal	January 2011
180° Ferroelectric Stripe Nanodomains in BiFeO ₃ Thin Films Chen, Zuhuang; Liu, Jian; Qi, Yajun Nano Letters, Vol. 15, Issue 10 https://doi.org/10.1021/acs.nanolett.5b02031	journal	September 2015
Enhancement of the anisotropic photocurrent in ferroelectric oxides by strain gradients Chu, Kanghyun; Jang, Byung-Kweon; Sung, Ji Ho Nature Nanotechnology, Vol. 10, Issue 11 https://doi.org/10.1038/nnano.2015.191	journal	August 2015
High dielectric constant ceramics von Hippel, A.; Breckenridge, R. G.; Chesley, F. G. Industrial & Engineering Chemistry, Vol. 38, Issue 11 https://doi.org/10.1021/ie50443a009	journal	November 1946
Head-to-head and tail-to-tail $180^{°}$ domain walls in an isolated ferroelectric Gureev, M. Y.; Tagantsev, A. K.; Setter, N. Physical Review B, Vol. 83, Issue 18 https://doi.org/10.1103/PhysRevB.83.184104	journal	May 2011
Tunable Metallic Conductance in Ferroelectric Nanodomains Maksymovych, Peter; Morozovska, Anna N.; Yu, Pu Nano Letters, Vol. 12, Issue 1 https://doi.org/10.1021/nl203349b	journal	December 2011
Epitaxial BiFeO₃ Multiferroic Thin Film Heterostructures Wang, J.; Neaton, J. B.; Zheng, H. Science, Vol. 299, Issue 5613, p. 1719-1722 https://doi.org/10.1126/science.1080615	journal	March 2003
Domain Engineering for Enhanced Ferroelectric Properties of Epitaxial (001) BiFeO Thin Films Jang, Ho Won; Ortiz, Daniel; Baek, Seung-Hyub Advanced Materials, Vol. 21, Issue 7 https://doi.org/10.1002/adma.200800823	journal	February 2009
Domain Dynamics During Ferroelectric Switching Nelson, C. T.; Gao, P.; Jokisaari, J. R. Science, Vol. 334, Issue 6058 https://doi.org/10.1126/science.1206980	journal	November 2011
Domain Wall Geometry Controls Conduction in Ferroelectrics Vasudevan, R. K.; Morozovska, A. N.; Eliseev, E. A. Nano Letters, Vol. 12, Issue 11 https://doi.org/10.1021/nl302382k	journal	September 2012
Effect of electrical boundary conditions on ferroelectric domain structures in thin films Li, Y. L.; Hu, S. Y.; Liu, Z. K. Applied Physics Letters, Vol. 81, Issue 3 https://doi.org/10.1063/1.1492025	journal	July 2002
Spontaneous Vortex Nanodomain Arrays at Ferroelectric Heterointerfaces Nelson, Christopher T.; Winchester, Benjamin; Zhang, Yi Nano Letters, Vol. 11, Issue 2 https://doi.org/10.1021/nl1041808	journal	February 2011
Evidence for Room-Temperature Multiferroicity in a Compound with a Giant Axial Ratio Béa, H.; Dupé, B.; Fusil, S. Physical Review Letters, Vol. 102, Issue 21 https://doi.org/10.1103/PhysRevLett.102.217603	journal	May 2009
A Thin Film Approach to Engineering Functionality into Oxides Schlom, Darrell G.; Chen, Long-Qing; Pan, Xiaoqing Journal of the American Ceramic Society, Vol. 91, Issue 8 https://doi.org/10.1111/j.1551-2916.2008.02556.x	journal	August 2008
Defect-Induced Hedgehog Polarization States in Multiferroics Li, Linze; Cheng, Xiaoxing; Jokisaari, Jacob R. Physical Review Letters, Vol. 120, Issue 13 https://doi.org/10.1103/PhysRevLett.120.137602	journal	March 2018
Observation of polar vortices in oxide superlattices Yadav, A. K.; Nelson, C. T.; Hsu, S. L. Nature, Vol. 530, Issue 7589 https://doi.org/10.1038/nature16463	journal	January 2016
Polarization charge as a reconfigurable quasi-dopant in ferroelectric thin films Crassous, Arnaud; Sluka, Tomas; Tagantsev, Alexander K. Nature Nanotechnology, Vol. 10, Issue 7 https://doi.org/10.1038/nnano.2015.114	journal	June 2015
Stripe domain structure in epitaxial (001) BiFeO3 thin films on orthorhombic TbScO3 substrate Folkman, C. M.; Baek, S. H.; Jang, H. W. Applied Physics Letters, Vol. 94, Issue 25 https://doi.org/10.1063/1.3152009	journal	June 2009
A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO₂ films O'Regan, Brian; Grätzel, Michael Nature, Vol. 353, Issue 6346, p. 737-740 https://doi.org/10.1038/353737a0	journal	October 1991
Nanoscale Bandgap Tuning across an Inhomogeneous Ferroelectric Interface Wang, Jing; Huang, Houbing; He, Wangqiang ACS Applied Materials & Interfaces, Vol. 9, Issue 29 https://doi.org/10.1021/acsami.7b05138	journal	July 2017
The origin of the photo-emf in ferroelectric and non-ferroelectric materials Ruppel, W.; Von Baltz, R.; Wurfel, P. Ferroelectrics, Vol. 43, Issue 1 https://doi.org/10.1080/00150198208210630	journal	June 1982
Evidence of Sharp and Diffuse Domain Walls in ${BiFeO}_{3}$ by Means of Unit-Cell-Wise Strain and Polarization Maps Obtained with High Resolution Scanning Transmission Electron Microscopy Lubk, A.; Rossell, M. D.; Seidel, J. Physical Review Letters, Vol. 109, Issue 4 https://doi.org/10.1103/PhysRevLett.109.047601	journal	July 2012
Encountering domains in ferroelectrics Vul, B. M.; Guro, G. M.; Ivanchik, I. I. Ferroelectrics, Vol. 6, Issue 1 https://doi.org/10.1080/00150197308237691	journal	January 1973
Photoconductivity in BiFeO3 thin films Basu, S. R.; Martin, L. W.; Chu, Y. H. Applied Physics Letters, Vol. 92, Issue 9 https://doi.org/10.1063/1.2887908	journal	March 2008
Conduction through 71° Domain Walls in ${BiFeO}_{3}$ Thin Films Farokhipoor, S.; Noheda, B. Physical Review Letters, Vol. 107, Issue 12 https://doi.org/10.1103/PhysRevLett.107.127601	journal	September 2011
Polar Domains in Lead Titanate Films under Tensile Strain Catalan, G.; Janssens, A.; Rispens, G. Physical Review Letters, Vol. 96, Issue 12 https://doi.org/10.1103/PhysRevLett.96.127602	journal	March 2006
First-Principles Calculation of the Bulk Photovoltaic Effect in Bismuth Ferrite Young, Steve M.; Zheng, Fan; Rappe, Andrew M. Physical Review Letters, Vol. 109, Issue 23 https://doi.org/10.1103/PhysRevLett.109.236601	journal	December 2012
Domain Selectivity in BiFeO ₃ Thin Films by Modified Substrate Termination Solmaz, Alim; Huijben, Mark; Koster, Gertjan Advanced Functional Materials, Vol. 26, Issue 17 https://doi.org/10.1002/adfm.201505065	journal	March 2016
Domain-wall conduction in ferroelectric BiFeO3 controlled by accumulation of charged defects Rojac, Tadej; Bencan, Andreja; Drazic, Goran Nature Materials, Vol. 16, Issue 3 https://doi.org/10.1038/nmat4799	journal	November 2016
Threading dislocations in epitaxial ferroelectric PbZr _0.2 Ti _0.8 O ₃ films and their effect on polarization backswitching Vrejoiu, I.; Le Rhun, G.; Zakharov, N. D. Philosophical Magazine, Vol. 86, Issue 28 https://doi.org/10.1080/14786430600728653	journal	October 2006
Atomic-Scale Compensation Phenomena at Polar Interfaces Chisholm, Matthew F.; Luo, Weidong; Oxley, Mark P. Physical Review Letters, Vol. 105, Issue 19 https://doi.org/10.1103/PhysRevLett.105.197602	journal	November 2010
Domain Wall Conductivity in La-Doped ${BiFeO}_{3}$ Seidel, J.; Maksymovych, P.; Batra, Y. Physical Review Letters, Vol. 105, Issue 19, Article No. 197603 https://doi.org/10.1103/PhysRevLett.105.197603	journal	November 2010
Ferroelectric Photodetector with High Current on–off Ratio (∼1 × 10 ⁴ %) in Self-Assembled Topological Nanoislands Wang, Jing; Ma, Ji; Yang, Yuben ACS Applied Electronic Materials, Vol. 1, Issue 6 https://doi.org/10.1021/acsaelm.9b00060	journal	May 2019
Atomic Scale Structure Changes Induced by Charged Domain Walls in Ferroelectric Materials Li, Linze; Gao, Peng; Nelson, Christopher T. Nano Letters, Vol. 13, Issue 11 https://doi.org/10.1021/nl402651r	journal	October 2013
Atomic-Scale Mechanisms of Defect-Induced Retention Failure in Ferroelectrics Li, Linze; Zhang, Yi; Xie, Lin Nano Letters, Vol. 17, Issue 6 https://doi.org/10.1021/acs.nanolett.7b00696	journal	May 2017
Thickness scaling of ferroelastic domains in PbTiO ₃ films on DyScO ₃ Nesterov, O.; Matzen, S.; Magen, C. Applied Physics Letters, Vol. 103, Issue 14 https://doi.org/10.1063/1.4823536	journal	September 2013
Free-electron gas at charged domain walls in insulating BaTiO3 Sluka, Tomas; Tagantsev, Alexander K.; Bednyakov, Petr Nature Communications, Vol. 4, Issue 1 https://doi.org/10.1038/ncomms2839	journal	May 2013
Air-Stable All-Inorganic Nanocrystal Solar Cells Processed from Solution Gur, Ilan; Fromer, Neil A.; Geier, Michael L. Science, Vol. 310, Issue 5747, p. 462-465 https://doi.org/10.1126/science.1117908	journal	October 2005
Electrical half-wave rectification at ferroelectric domain walls Schaab, Jakob; Skjærvø, Sandra H.; Krohns, Stephan Nature Nanotechnology, Vol. 13, Issue 11 https://doi.org/10.1038/s41565-018-0253-5	journal	September 2018
Evolution of flux-closure domain arrays in oxide multilayers with misfit strain Li, S.; Wang, Y. J.; Zhu, Y. L. Acta Materialia, Vol. 171 https://doi.org/10.1016/j.actamat.2019.04.020	journal	June 2019
Nonvolatile ferroelectric domain wall memory Sharma, Pankaj; Zhang, Qi; Sando, Daniel Science Advances, Vol. 3, Issue 6 https://doi.org/10.1126/sciadv.1700512	journal	June 2017
Giant Resistive Switching via Control of Ferroelectric Charged Domain Walls Li, Linze; Britson, Jason; Jokisaari, Jacob R. Advanced Materials, Vol. 28, Issue 31 https://doi.org/10.1002/adma.201600160	journal	May 2016
Local polarization dynamics in ferroelectric materials Kalinin, Sergei V.; Morozovska, Anna N.; Chen, Long Qing Reports on Progress in Physics, Vol. 73, Issue 5, Article No. 056502 https://doi.org/10.1088/0034-4885/73/5/056502	journal	April 2010
Deterministic control of ferroelastic switching in multiferroic materials Balke, N.; Choudhury, S.; Jesse, S. Nature Nanotechnology, Vol. 4, Issue 12, p. 868-875 https://doi.org/10.1038/nnano.2009.293	journal	October 2009
Stress-induced $R - M_{A} - M_{C} - T$ symmetry changes in BiFeO $_{3}$ films Christen, H. M.; Nam, J. H.; Kim, H. S. Physical Review B, Vol. 83, Issue 14 https://doi.org/10.1103/PhysRevB.83.144107	journal	April 2011
Controllable conductive readout in self-assembled, topologically confined ferroelectric domain walls Ma, Ji; Ma, Jing; Zhang, Qinghua Nature Nanotechnology, Vol. 13, Issue 10 https://doi.org/10.1038/s41565-018-0204-1	journal	July 2018
Above-bandgap voltages from ferroelectric photovoltaic devices Yang, S. Y.; Seidel, J.; Byrnes, S. J. Nature Nanotechnology, Vol. 5, Issue 2 https://doi.org/10.1038/nnano.2009.451	journal	January 2010
Bridging Multiferroic Phase Transitions by Epitaxial Strain in ${BiFeO}_{3}$ Infante, I. C.; Lisenkov, S.; Dupé, B. Physical Review Letters, Vol. 105, Issue 5 https://doi.org/10.1103/PhysRevLett.105.057601	journal	July 2010
Tip-enhanced photovoltaic effects in bismuth ferrite Alexe, Marin; Hesse, Dietrich Nature Communications, Vol. 2, Issue 1 https://doi.org/10.1038/ncomms1261	journal	March 2011
Control of Domain Structures in Multiferroic Thin Films through Defect Engineering Li, Linze; Jokisaari, Jacob R.; Zhang, Yi Advanced Materials, Vol. 30, Issue 38 https://doi.org/10.1002/adma.201802737	journal	August 2018
Strain Tuning of Ferroelectric Thin Films Schlom, Darrell G.; Chen, Long-Qing; Eom, Chang-Beom Annual Review of Materials Research, Vol. 37, Issue 1 https://doi.org/10.1146/annurev.matsci.37.061206.113016	journal	August 2007
Formation of charged ferroelectric domain walls with controlled periodicity Bednyakov, Petr S.; Sluka, Tomas; Tagantsev, Alexander K. Scientific Reports, Vol. 5, Issue 1 https://doi.org/10.1038/srep15819	journal	October 2015

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