Orthorhombic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>BiFeO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Yang, Jinn‐Chuang; He, Qing; Suresha, S. J.; Kuo, Chang Yang; Peng, Chun; Haislmaier, Ryan; Motyka, M. A.; Gao, Sheng; Adamo, Carolina; Lin, Hong Ji; Hu, Zhiwei; Chang, Li; Tjeng, L. H.; Arenholz, Elke; Podraza, Nikolas J.; Bernhagen, M.; Uecker, R.; Schlom, D. G.; Gopalan, Venkatraman; Chen, L. Q.; Chen, C. T.; Ramesh, R.; Chu, Ying Hao

doi:10.1103/physrevlett.109.247606

Cited by 123 publications

(110 citation statements)

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“…28 Recent studies show a pathway to stabilize this new orthorhombic phase in BFO films via strain engineering. 29,30 Moreover, an orthorhombic-like-rhombohedral-like (O-R) phase boundary has also been investigated in rare-earth-substituted bismuth ferrite films that exhibit an enhanced piezoelectric and dielectric response. 31,32 Lee et al 33 recently investigated tensile-strained BFO thin films, revealing their magnetic properties of R and O phases and associated electrical switchability.…”

Section: Introductionmentioning

confidence: 99%

Enhanced conductivity at orthorhombic–rhombohedral phase boundaries in BiFeO3 thin films

et al. 2016

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Enhanced properties in modern functional materials can often be found at structural transition regions, such as morphotropic phase boundaries (MPB), owing to the coexistence of multiple phases with nearly equivalent energies. Strain-engineered MPBs have emerged in epitaxially grown BiFeO 3 (BFO) thin films by precisely tailoring a compressive misfit strain, leading to numerous intriguing phenomena, such as a massive piezoelectric response, magnetoelectric coupling, interfacial magnetism and electronic conduction. Recently, an orthorhombic-rhombohedral (O-R) phase boundary has also been found in tensile-strained BFO. In this study, we characterise the crystal structure and electronic properties of the two competing O and R phases using X-ray diffraction, scanning probe microscope and scanning transmission electron microscopy (STEM). We observe the temperature evolution of R and O domains and find that the domain boundaries are highly conductive. Temperature-dependent measurements reveal that the conductivity is thermally activated for R-O boundaries. STEM observations point to structurally wide boundaries, significantly wider than in other systems. Therefore, we reveal a strong correlation between the highly conductive domain boundaries and structural material properties. These findings provide a pathway to use phase boundaries in this system for novel nanoelectronic applications. INTRODUCTIONMultiferroic BiFeO 3 (BFO) has attracted great interest as a promising lead-free functional material owing to its key properties, including electromechanical and magnetoelectric coupling, domain wall conductance, bias-induced semiconductor-insulator transitions and photovoltaic effects. 1-7 Bismuth ferrite is a room temperature multiferroic perovskite exhibiting antiferromagnetism that is coupled with ferroelectric order. 8 Below the Curie temperature, bulk BFO is considered to have a rhombohedral R3c space group structure that allows antiphase octahedral tilting and ionic displacements from the center of symmetry along the [111] pseudocubic direction. 9,10 The recent discovery of a strain-induced morphotropic phase boundary in BFO films grown on (001) LaAlO 3 has attracted further interest with the compressive strain imposed by an underlying substrate stabilizing a tetragonally distorted phase. 11-17 Mixed-phase regions exhibit the coexistence of both R-and T-like phases with the ability to selectively switch between the two phases by an external electric field and force. [18][19][20][21][22] Interestingly, the strong correlation between T-R interfaces and their enhanced properties, such as the finding of a large electric-field-induced strain 23 and a giant piezoelectric d 33 coefficient, led to extensive studies of bismuth ferrite films under compressive strain by both experimental and theoretical approaches. Moreover, a correlation between the elasticity at the T-R interfaces and electronic conduction was also reported. 24 Triggered by

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Section: Introductionmentioning

confidence: 99%

Enhanced conductivity at orthorhombic–rhombohedral phase boundaries in BiFeO3 thin films

et al. 2016

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“…highly-elongated tetragonal-like metastable phase (T-phase, T N ~ 380 K) [22][23][24][25][26], a rhombohedral-like monoclinic phase [27][28][29][30] and an orthorhombic phase [31][32][33] [11].…”

Section: Introductionmentioning

confidence: 99%

Strain-gradient-induced magnetic anisotropy in straight-stripe mixed-phase bismuth ferrites: Insight into flexomagnetism

et al. 2017

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Implementation of antiferromagnetic compounds as active elements in spintronics has been hindered by their insensitive nature against external perturbations which causes difficulties in switching among different antiferromagnetic spin configurations. Electrically-controllable strain gradient can become a key parameter to tune the antiferromagnetic states of multiferroic materials. We have discovered a correlation between an electrically-written straight-stripe mixed-phase boundary and an in-plane antiferromagnetic spin axis in highly-

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“…[1][2][3][4][5][6][7][8] Recently, through an assistance of strain engineering in thin film process, BFO exhibits a rich variety of phases including rhombohedral, monoclinic, and orthorhombic structures. [9][10][11][12][13][14] Numerous efforts have also been made to reveal the fundamental understanding of correlation between structure and electric/magnetic order parameters. In the past decade, a great research interest has notably focused on discovering the pseudo-tetragonal phase with large axial ratio (c/a) of ∼1.25 that can be only epitaxially stabilized on the substrate with compressive misfit strain greater than 4.5%.…”

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Tetragonal BiFeO₃ on yttria-stabilized zirconia

Liu

Gao

et al. 2015

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OrthorhombicBiFeO3

Cited by 123 publications

References 29 publications

Enhanced conductivity at orthorhombic–rhombohedral phase boundaries in BiFeO3 thin films

Enhanced conductivity at orthorhombic–rhombohedral phase boundaries in BiFeO3 thin films

Strain-gradient-induced magnetic anisotropy in straight-stripe mixed-phase bismuth ferrites: Insight into flexomagnetism

Tetragonal BiFeO₃ on yttria-stabilized zirconia

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OrthorhombicBiFeO3

Cited by 123 publications

References 29 publications

Enhanced conductivity at orthorhombic–rhombohedral phase boundaries in BiFeO3 thin films

Enhanced conductivity at orthorhombic–rhombohedral phase boundaries in BiFeO3 thin films

Strain-gradient-induced magnetic anisotropy in straight-stripe mixed-phase bismuth ferrites: Insight into flexomagnetism

Tetragonal BiFeO3 on yttria-stabilized zirconia

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Tetragonal BiFeO₃ on yttria-stabilized zirconia