Untilting BiFeO3: The influence of substrate boundary conditions in ultra-thin BiFeO3 on SrTiO3

Yang, Yongsoo; Adamo, Carolina; Schlom, Darrell G.; Clarke, Roy

doi:10.1063/1.4827596

Cited by 22 publications

(20 citation statements)

References 27 publications

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“…A piezomagnetic coupling of these phases has also been suspected to enhance the magnetization of the samples [13,14]. Very recently, * frederic.pailloux@univ-poitiers.fr the influence of the octahedra rotation coupling at the film BiFeO 3 //SrTiO 3 interface has been reported [15] in line with the antiferrodistortive coupling previously observed [16] and theoretically predicted [17].…”

Section: Introductionsupporting

confidence: 67%

“…Indeed, elemental profiles do not show any stoichiometric fluctuations. The AlO 6 octahedra geometry in the LAO could constrain the first layers of BFO to adopt a specific organization by limiting the pyramidal tilts as already proposed for similar systems [15][16][17]. The influence of such antiferrodistortive coupling across the interface was demonstrated in Ref.…”

Section: Eels Analysismentioning

confidence: 79%

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Atomic structure and microstructures of supertetragonal multiferroicBiFeO3thin films

et al. 2014

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Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Atomic structure and microstructures of supertetragonal multiferroic BiFeO 3 thin films Pailloux, F.; Couillard, M.; Fusil, S.; Bruno, F.; Saidi, W.; Garcia, V.; Carrétéro, C.; Jacquet, E.; Bibes, M.; Barthélémy, A.; Botton, G. A.; Pacaud, J.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=fr L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21272873&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=21272873&lang=fr READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1103/PhysRevB.89.104106 Physics, 89, 10, 2014-03-12 We revisit the atomic structure and microstructure of the so-called supertetragonal phases of highly strained epitaxial BiFeO 3 thin films. Quantitative atomic resolution scanning transmission electron microscopy is used to directly image the atomic positions. A crystallographic phase suggested by electron diffraction and predicted by ab initio calculations is evidenced. Microtwins are reported in thickest films. Electron energy loss spectroscopy is further employed to reveal subtle electronic structure features, which, interpreted in a framework of antiferrodistortive distortions coupling with the substrate, point towards a phase closer to the P 4mm purely tetragonal phase. Physical Review B -Condensed Matter and Materials

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Section: Introductionsupporting

confidence: 67%

Section: Eels Analysismentioning

confidence: 79%

Atomic structure and microstructures of supertetragonal multiferroicBiFeO3thin films

et al. 2014

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“…In these latter cases, a domain pattern emerges as the material is cooled through the transition temperature, and the domain configuration is such as to minimize the electrostatic and elastic energies, typically in the absence of mobile charges. For BiFeO 3 it is known that ultrathin films are tetragonal, and therefore we can assume that during the growth of the first few monolayers, a tetragonal material is formed. Adsorbed species at the surface of the LSMO electrode (i.e., the surface onto which BiFeO 3 nucleates), oxygen vacancies in the LSMO and in BiFeO 3 , and adsorbed species at the top surface of the BiFeO 3 film, can easily result in a uniformly poled material (the effects of chemically absorbed species at the surface of a film on its polarization orientation are well reported in the literature).…”

Section: Resultsmentioning

confidence: 99%

Ferroelectric Self‐Poling, Switching, and Monoclinic Domain Configuration in BiFeO₃ Thin Films

Beekman

Siemons

Chi

et al. 2016

Adv Funct Materials

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Self‐poling of ferroelectric films, i.e., a preferred, uniform direction of the ferroelectric polarization in as‐grown samples is often observed yet poorly understood despite its importance for device applications. The multiferroic perovskite BiFeO3, which crystallizes in two distinct structural polymorphs depending on applied epitaxial strain, is well known to exhibit self‐poling. This study investigates the effect of self‐poling on the monoclinic domain configuration and the switching properties of the two polymorphs of BiFeO3 (R′ and T′) in thin films grown on LaAlO3 substrates with slightly different La0.3Sr0.7MnO3 buffer layers. This study shows that the polarization state formed during the growth acts as “imprint” on the polarization and that switching the polarization away from this self‐poled direction can only be done at the expense of the sample's monoclinic domain configuration. The observed reduction of the monoclinic domain size is largely reversible; hence, the domain size is restored when the polarization is switched back to its original orientation. This is a direct consequence of the growth taking place in the polar phase (below Tc). Switching the polarization away from the preferred configuration, in which defects and domain patterns synergistically minimize the system's energy, leads to a domain state with smaller (and more highly strained and distorted) monoclinic domains.

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“…23 The phase purity and high epitaxy quality of the samples were verified by the X-ray reciprocal space mapping where the 4 nm film is tetragonal and the thicker films are monoclinic. 24 All samples have a single domain in the sample normal direction with an in-plane domain size of 400, 40, and 40 nm for the 4, 20, and 35 nm thick samples, respectively. The pump photon energy is below the bandgaps of STO (3.2 eV) and LSAT (5 eV), thus the photo response of the substrates is negligible.…”

confidence: 99%

Nanoscale excitonic photovoltaic mechanism in ferroelectric BiFeO3 thin films

Adamo

Rowland

et al. 2018

APL Materials

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We report an electrode-free photovoltaic experiment in epitaxial BiFeO3 thin films where the picosecond optical absorption arising from carrier dynamics and piezoelectric lattice distortion due to the photovoltaic field are correlated at nanoscale. The data strongly suggest that the photovoltaic effect in phase-pure BiFeO3 originates from diffusion of charge-neutral excitons and their subsequent dissociation localized at sample interfaces. This is in stark contrast to the belief that carrier separation is uniform within the sample due to the lack of center of symmetry in BiFeO3. This finding is important for formulating strategies in designing practical photovoltaic ferroelectric devices.

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Untilting BiFeO3: The influence of substrate boundary conditions in ultra-thin BiFeO3 on SrTiO3

Cited by 22 publications

References 27 publications

Atomic structure and microstructures of supertetragonal multiferroicBiFeO3thin films

Atomic structure and microstructures of supertetragonal multiferroicBiFeO3thin films

Ferroelectric Self‐Poling, Switching, and Monoclinic Domain Configuration in BiFeO₃ Thin Films

Nanoscale excitonic photovoltaic mechanism in ferroelectric BiFeO3 thin films

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Untilting BiFeO3: The influence of substrate boundary conditions in ultra-thin BiFeO3 on SrTiO3

Cited by 22 publications

References 27 publications

Atomic structure and microstructures of supertetragonal multiferroicBiFeO3thin films

Atomic structure and microstructures of supertetragonal multiferroicBiFeO3thin films

Ferroelectric Self‐Poling, Switching, and Monoclinic Domain Configuration in BiFeO3 Thin Films

Nanoscale excitonic photovoltaic mechanism in ferroelectric BiFeO3 thin films

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Product

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Ferroelectric Self‐Poling, Switching, and Monoclinic Domain Configuration in BiFeO₃ Thin Films