Ferroelectric domain states of a tetragonal BiFeO3 thin film investigated by second harmonic generation microscopy

Roh, Chang Jae; Hamh, Sun Young; Woo, Chang Su; Kim, Kwang Eun; Yang, Chan−Ho; Lee, Jong Seok

doi:10.1186/s11671-017-2126-5

Cited by 11 publications

(6 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For NBT-N, one double lobe in horizontal mode and 2 double lobes in vertical mode are observed in Fig. 3 D, which indicates the presence of tetragonal phase [ 41 ]. In contrast, for NBT-L, both horizontal and vertical modes have 2 double lobes (Fig.…”

Section: Resultsmentioning

confidence: 99%

Interfacial Oxygen Octahedral Coupling-Driven Robust Ferroelectricity in Epitaxial Na _0.5 Bi _0.5 TiO ₃ Thin Films

Han

Zhang

et al. 2023

Research

View full text Add to dashboard Cite

The oxygen octahedral rotation (OOR) forms fundamental atomic distortions and symmetries in perovskite oxides and definitely determines their properties and functionalities. Therefore, epitaxial strain and interfacial structural coupling engineering have been developed to modulate the OOR patterns and explore novel properties, but it is difficult to distinguish the 2 mechanisms. Here, different symmetries are induced in Na 0.5 Bi 0.5 TiO 3 (NBT) epitaxial films by interfacial oxygen octahedral coupling rather than epitaxial strain. The NBT film grown on the Nb:SrTiO 3 substrate exhibits a paraelectric tetragonal phase, while with La 0.5 Sr 0.5 MnO 3 as a buffer layer, a monoclinic phase and robust ferroelectricity are obtained, with a remanent polarization of 42 μC cm −2 and a breakdown strength of 7.89 MV cm −1 , which are the highest record among NBT-based films. Moreover, the interfacial oxygen octahedral coupling effect is demonstrated to propagate to the entire thickness of the film, suggesting an intriguing long-range effect. This work provides a deep insight into understanding the structure modulation in perovskite heterostructures and an important avenue for achieving unique functionalities.

show abstract

Section: Resultsmentioning

confidence: 99%

Interfacial Oxygen Octahedral Coupling-Driven Robust Ferroelectricity in Epitaxial Na _0.5 Bi _0.5 TiO ₃ Thin Films

Han

Zhang

et al. 2023

Research

View full text Add to dashboard Cite

show abstract

“…At the strain-driven morphotropic phase boundary, exotic conducting states and enhanced piezoelectric coefficients have been observed [104,105]. The SHG contributions associated with the two phases have different relative intensities as a function of the angle of incidence [101][102][103]106] as shown in Figure 10c. The pseudo-tetragonal phase (in red) has a symmetric behavior similar to a genuine tetragonal structure (cf.…”

Section: Optical Second Harmonic In Domain Engineered Ferroic Thin Filmsmentioning

confidence: 90%

Probing Ferroic States in Oxide Thin Films Using Optical Second Harmonic Generation

et al. 2018

View full text Add to dashboard Cite

Forthcoming low-energy consumption oxide electronics rely on the deterministic control of ferroelectric and multiferroic domain states at the nanoscale. In this review, we address the recent progress in the field of investigation of ferroic order in thin films and heterostructures, with a focus on non-invasive optical second harmonic generation (SHG). For more than 50 years, SHG has served as an established technique for probing ferroic order in bulk materials. Here, we will survey the specific new aspects introduced to SHG investigation of ferroelectrics and multiferroics by working with thin film structures. We show how SHG can probe complex ferroic domain patterns non-invasively and even if the lateral domain size is below the optical resolution limit or buried beneath an otherwise impenetrable cap layer. We emphasize the potential of SHG to distinguish contributions from individual (multi-) ferroic films or interfaces buried in a device or multilayer architecture. Special attention is given to monitoring switching events in buried ferroic domain-and domain-wall distributions by SHG, thus opening new avenues towards the determination of the domain dynamics. Another aspect studied by SHG is the role of strain. We will finally show that by integrating SHG into the ongoing thin film deposition process, we can monitor the emergence of ferroic order and properties in situ, while they emerge during growth. Our review closes with an outlook, emphasizing the present underrepresentation of ferroic switching dynamics in the study of ferroic oxide heterostructures.

show abstract

“…SHG denotes frequency doubling of a light wave in a material, a process that in its leading order is permitted in the absence of inversion symmetry. This makes SHG an efficient tool for the investigation of ferroelectricity at sample thicknesses down to a single unit cell [28][29][30][31][32][33][34][35][36][37][38][39][40][41]. Furthermore, the insertion of the bottom electrode is not required for detecting polarization by SHG, in contrast to PFM.…”

Section: A Characterization Of Ordering Of Dipole Moments In the Pto|...mentioning

confidence: 99%

Optical second harmonic signature of phase coexistence in ferroelectric|dielectric heterostructures

et al. 2022

View full text Add to dashboard Cite

An exotic coexistence of polar states is known to occur in ferroelectric|dielectric PbTiO 3 |SrTiO 3 (PTO|STO) heterostructures. In the PTO layers with a thickness of 10-20 unit cells, in-plane-polarized regions order alongside the so-called vortex phase with a whirl-like arrangement of electric dipoles. We investigate the optical signature of these polar phases noninvasively using optical second harmonic generation (SHG) on PTO|STO-based heterostructures. We identify the phase coexistence down to a single PTO|STO bilayer. By comparing the SHG yield in dependence of the number of PTO layers, we further find that interlayer coupling plays an important role in setting the final polarization state. Our nonlinear optical experiments demonstrate the potential of this noninvasive approach for the identification and understanding of complex noncollinear ordering of dipole moments in oxide heterostructures and lays the groundwork for their operando investigation.

show abstract

Ferroelectric domain states of a tetragonal BiFeO3 thin film investigated by second harmonic generation microscopy

Cited by 11 publications

References 19 publications

Interfacial Oxygen Octahedral Coupling-Driven Robust Ferroelectricity in Epitaxial Na _0.5 Bi _0.5 TiO ₃ Thin Films

Interfacial Oxygen Octahedral Coupling-Driven Robust Ferroelectricity in Epitaxial Na _0.5 Bi _0.5 TiO ₃ Thin Films

Probing Ferroic States in Oxide Thin Films Using Optical Second Harmonic Generation

Optical second harmonic signature of phase coexistence in ferroelectric|dielectric heterostructures

Contact Info

Product

Resources

About

Ferroelectric domain states of a tetragonal BiFeO3 thin film investigated by second harmonic generation microscopy

Cited by 11 publications

References 19 publications

Interfacial Oxygen Octahedral Coupling-Driven Robust Ferroelectricity in Epitaxial Na 0.5 Bi 0.5 TiO 3 Thin Films

Interfacial Oxygen Octahedral Coupling-Driven Robust Ferroelectricity in Epitaxial Na 0.5 Bi 0.5 TiO 3 Thin Films

Probing Ferroic States in Oxide Thin Films Using Optical Second Harmonic Generation

Optical second harmonic signature of phase coexistence in ferroelectric|dielectric heterostructures

Contact Info

Product

Resources

About

Interfacial Oxygen Octahedral Coupling-Driven Robust Ferroelectricity in Epitaxial Na _0.5 Bi _0.5 TiO ₃ Thin Films

Interfacial Oxygen Octahedral Coupling-Driven Robust Ferroelectricity in Epitaxial Na _0.5 Bi _0.5 TiO ₃ Thin Films