Strain engineering of epitaxial oxide heterostructures beyond substrate limitations

Deng, Xiong; Chen, Chao; Chen, Deyang; Cai, Xiangbin; Yin, Xiaozhe; Xu, Chao; Sun, Fei; Li, Caiwen; Li, Yan; Xu, Han; Ye, Mao; Tian, Guo; Fan, Zhen; Hou, Zhipeng; Qin, Minghui; Chen, Yu; Luo, Zhenlin; Lu, Xubing; Zhou, Guofu; Chen, Lang; Wang, Ning; Zhu, Ye; Gao, Xingsen; Liu, Jun‐Ming

doi:10.1016/j.matt.2021.02.006

Cited by 25 publications

(37 citation statements)

References 70 publications

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“…Here, we use Al 2 O 3 (10)(11)(12) wafers as the substrates to grow a-ZnO epitaxial films, and the results are shown in Figure S1 in the Supporting Information. One of the most striking findings is that the ZnO lattice exhibits an out-of-plane tilt with respect to the substrate surface, as revealed by the V-shaped pattern in the contour plotting of the ZnO (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) ω−ϕ scan (Figure 1a). At azimuthal angles of 0 and 360°, ω is centered at 28.5°; at ϕ = 180°, it peaks at 28.0°.…”

Section: Resultsmentioning

confidence: 96%

“…13 On the other hand, a Ca 0.96 Ce 0.04 MnO 3 interlayer that has similar in-plane lattice constants with T-BFO was used and the highly elongated phase can be formed on arbitrary ABO 3 substrates. 14 Very recently, defect engineering by helium implantation was proposed to modify the structure of BFO in a continuous manner. 15 Experimentally, this scheme not only stabilizes the T-like phase but also enables a flexible control on tetragonality and polarization symmetry.…”

Section: Introductionmentioning

confidence: 99%

“…Although a M C -M A -T phase transition with elevated temperature was reported by different groups, 17,18 both the M A and true tetragonal BFO can be stabilized at room temperature through chemical engineering or thermal management. 14,19,20 Despite these efforts, it still remains a great challenge to precisely control the structure of BFO. nm due to the metastable nature, 4,12 hindering its possible applications.…”

Section: Introductionmentioning

confidence: 99%

“…Although anisotropic strain is powerful in tuning charge and spin phases, 21,22 it was seldom utilized to manipulate the structural phase transitions due to the limited anisotropies of the commonly used substrates. Herein, a strongly anisotropic template−nonpolar (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)-faceted ZnO (abbreviated as a-ZnO) was employed to exert highly anisotropic strains on BFO. The hexagonal ZnO unit cell corresponds to an orthogonal one through index transformation, 23 with ZnO (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) as one of the basal planes.…”

Section: Introductionmentioning

confidence: 99%

“…Herein, a strongly anisotropic template−nonpolar (11)(12)(13)(14)(15)(16)(17)(18)(19)(20)-faceted ZnO (abbreviated as a-ZnO) was employed to exert highly anisotropic strains on BFO. The hexagonal ZnO unit cell corresponds to an orthogonal one through index transformation, 23 with ZnO (11)(12)(13)(14)(15)(16)(17)(18)(19)(20) as one of the basal planes. Large compressive and tensile strains are respectively imposed along two orthogonal ⟨110⟩ directions of BFO, shifting the energy balance between competing phases.…”

Section: Introductionmentioning

confidence: 99%

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Metastable Tetragonal BiFeO₃ Stabilized on Anisotropic a-Plane ZnO

Zhao

Yin

et al. 2021

Crystal Growth & Design

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The stabilization of the metastable tetragonal phase of BiFeO3 on the highly anisotropic ZnO(11-20) surface is reported. X-ray reciprocal space maps reveal that the BiFeO3 layer possesses true tetragonal symmetry rather than the monoclinic MC or MA structures. Heteroepitaxy generates strongly anisotropic misfit strains of 2.4 and −5.3% along two orthogonal ⟨110⟩ directions of tetragonal BiFeO3. Our analysis shows that such anisotropic strains are very powerful in tailoring the energy balance of competing phases, favoring the formation of tetragonal BiFeO3. Tetragonal BiFeO3 can be stabilized on the ZnO template up to a critical thickness of 110 nm, much larger than that of its monoclinic counterparts. The integration of such thick tetragonal BiFeO3 films with ZnO has important implications for future applications, as exemplified by the demonstration of a prototype metal/ferroelectric/semiconductor capacitor and the preparation of flexible tetragonal BiFeO3 nanomembranes. Additionally, the heteroepitaxial growth was also transposed to the integration of other perovskite oxides with ZnO. Our findings not only shed new light into the strain phase diagram of BiFeO3 but also open up a possible avenue toward oxide electronics.

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Section: Resultsmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Metastable Tetragonal BiFeO₃ Stabilized on Anisotropic a-Plane ZnO

Zhao

Yin

et al. 2021

Crystal Growth & Design

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Observation of Uniaxial Strain Tuned Spin Cycloid in a Freestanding BiFeO₃ Film

Ding

Sun

Zheng

et al. 2023

Adv Funct Materials

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Bismuth ferrite (BiFeO3) possesses a non‐collinear spin order while the ferroelectric order breaks space inversion symmetry. This allows efficient electric‐field control of magnetism and makes it a promising candidate for applications in low‐power spintronic devices. Epitaxial strain effects have been intensively studied and exhibit significant modulation of the magnetic order in bismuthBiFeO3, but tuning its spin structure with continuously varied uniaxial strain is still lacking at this moment. Herein, in situ uniaxial tensile strain is applied to a freestanding BiFeO3 film by mechanically stretching an organic substrate. A scanning nitrogen‐vacancy (NV) microscopy is applied to image the nanoscale magnetic order in real space. The strain is continuously increased from 0% to 1.5% and four images under different strains are acquired during this period. The images show that the spin cycloid tilts by ≈12.6° when strain approaches 1.5%. A first principle calculation is processed to show that the tilting is energetically favorable under such strain. The in situ strain applying method in combination with scanning NV microscope real‐space imaging ability paves a new way in studying the coupling between magnetic order and strain in BiFeO3 films.

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Co‐Polarized Second Harmonic Generation Induced by Ferroelectric Domains and Domain Wall Arrays

Gao

Chen

You

et al. 2022

Advanced Optical Materials

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Optical second harmonic generation (SHG) is a sensitive and powerful technique to probe various symmetry breaking, especially ferroelectric/magnetic domains, in artificial thin films or heterostructures. In a wide range of ferroelectric crystals, a non‐trivial broken symmetry will emerge at domain boundaries, however, the contribution of such symmetry breaking to SHG is often neglected due to its random orientation. Here, a co‐polarized SHG effect from the well‐aligned domain wall arrays is observed in BiFeO3 thin films. This SHG component is highly dependent on the local orientation of the wall arrays, and its polarization feature reveals the Néel‐like evolution of electric polar vectors in the wall region. Based on this intriguing effect, mixed‐phase patches with four possible orientations in the quasi‐tetragonal stripes are identified by polarization‐sensitive SHG mapping. These findings not only clarify a critical SHG contribution in this multiferroic material, but also demonstrate an optical approach for exploring phase‐determined function unit.

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Strain engineering of epitaxial oxide heterostructures beyond substrate limitations

Cited by 25 publications

References 70 publications

Metastable Tetragonal BiFeO₃ Stabilized on Anisotropic a-Plane ZnO

Metastable Tetragonal BiFeO₃ Stabilized on Anisotropic a-Plane ZnO

Observation of Uniaxial Strain Tuned Spin Cycloid in a Freestanding BiFeO₃ Film

Co‐Polarized Second Harmonic Generation Induced by Ferroelectric Domains and Domain Wall Arrays

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Strain engineering of epitaxial oxide heterostructures beyond substrate limitations

Cited by 25 publications

References 70 publications

Metastable Tetragonal BiFeO3 Stabilized on Anisotropic a-Plane ZnO

Metastable Tetragonal BiFeO3 Stabilized on Anisotropic a-Plane ZnO

Observation of Uniaxial Strain Tuned Spin Cycloid in a Freestanding BiFeO3 Film

Co‐Polarized Second Harmonic Generation Induced by Ferroelectric Domains and Domain Wall Arrays

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Metastable Tetragonal BiFeO₃ Stabilized on Anisotropic a-Plane ZnO

Metastable Tetragonal BiFeO₃ Stabilized on Anisotropic a-Plane ZnO

Observation of Uniaxial Strain Tuned Spin Cycloid in a Freestanding BiFeO₃ Film