raman spectroscopy setup  (JASCO Inc)

Journal: Acta Materialia

Article Title: Hierarchical domain structures in buckled ferroelectric free sheets

doi: 10.1016/j.actamat.2025.121080

Figure Lengend Snippet: FIG. 2. a) Schematic of the polarized Raman measurement. b) Optical image of the measured wrinkle (top), mapping of clusters with similar spectral features (middle) and mapping of integrated area under E(LO) Raman peak around 720 cm-1 (bottom). Dashed square in middle indicates area explored in Fig.3. c) Average spectra of the areas corresponding to the three identified clusters around a wrinkle in the BaTiO3 nm membrane on Pt/Si.

Article Snippet: Here we used a micro Raman Spectroscopy setup (RENISHAW Wire Raman microscope), which scans a laser (λ=532 nm) over the sample in steps of 150 nm while collecting and measuring the energy of the inelastic scattered photons after their interaction with the specimen’s lattice.

Techniques: Membrane

Journal: Acta Materialia

Article Title: Hierarchical domain structures in buckled ferroelectric free sheets

doi: 10.1016/j.actamat.2025.121080

Figure Lengend Snippet: FIG. 4. a) BSE image of a curved wrinkle with varying degrees of deviation from the equilibrium [010] direction. The image shows increased density of secondary (traverse) domain microstructures with increasing deviation angle. The different regions of the prototypical wrinkle are indicated at the bottom. The green window shows needles growing from domain wall steps, and yellow windows show bundles of secondary nanodomains confined within the neck and foot regions. b) Enlarged view of the upper region of a) (the yellow arrow points the same needle as in a)). Domain notations and polarization vectors (black arrows) are deduced from PFM and Raman microscopies (Figs. 2,3); the sign of vectors is arbitrary. Vertical dashed lines are a guide to the eye to show the orientation of a1/c domain-wall step ledges along the [010] direction. The inset is a magnified view of the yellow boxed area illustrating a domains-within-domain structure formed within traverse needles spanning through the wrinkle slopes. c) Left panel: schematics of needle growth from misfitting steps Right panel: BSE image of the transition from the neck to the slope region of a misoriented wrinkle, showing in detail the superposition effect of steps and needles along stepped a1/c domain-walls. False color is used to highlight fine contrast within the neck region. Straight dashed lines are guides to the eye to identify step ledges (vertical lines) and needles. Secondary a2 nano domains crossing the primary …a1/c/a1/c… domain bundle are indicated. Central panel: Schematical interpretation of the BSE image shown in the right panel.

Article Snippet: Here we used a micro Raman Spectroscopy setup (RENISHAW Wire Raman microscope), which scans a laser (λ=532 nm) over the sample in steps of 150 nm while collecting and measuring the energy of the inelastic scattered photons after their interaction with the specimen’s lattice.

Techniques: