Fast nanoscale imaging of strain in a multi-segment heterostructured nanowire with 2D Bragg ptychography

Hammarberg, S.; Dzhigaev, D.; Marcal, L.A.B.; Dagyte, V.; Björling, A.; Borgström, M.T.; Wallentin, J.

doi:10.1107/S1600576723010403

Figure 3
Strain in the InP segments. (a) Axial strain $[\varepsilon_{xx}]$ from FEM averaged along k_f. (b) Axial strain $[\varepsilon_{xx}]$ from scanning XRD. Note the deviating color scale. (c) Axial strain $[\varepsilon_{xx}]$ calculated from the phase of the experimental BPP reconstruction at the Bragg angle of segment 5, $[\theta_{\rm B}^5]$ . (d) Axial strain $[\varepsilon_{xx}]$ calculated from the phase of the simulated BPP reconstruction at the Bragg angle of segment 5, $[\theta_{\rm B}^5]$ . (e) Axial strain $[\varepsilon_{xx}]$ composed from the experimental BPP reconstructions at the respective Bragg angle of each segment $[\theta_{\rm B}^{1 - 5}]$ , as displayed in Fig. 1

(c). The Bragg angles for segment 2 and segment 3 are the same, $[\theta_{\rm B}^{2} = \theta_{\rm B}^3]$ , and hence these are from the same BPP reconstruction. (f) Axial strain $[\varepsilon_{xx}]$ composed from the simulated BPP reconstructions at the respective Bragg angle of each segment $[\theta_{\rm B}^{1 - 5}]$ , as displayed in Fig. 1

(d). Since the bending of the nanowire is not present in the FEM simulation, the Bragg angles are different from the experimental ones. Here, $[^{\rm FEM}\theta_{\rm B}^4 = {}^{\rm FEM}\theta_{\rm B}^5]$ . Note that the color scales in (a) and (c)–(f) are the same, but differ from (b). (g) Outline of (e) and (f), at the center of the nanowire. All strains are given as percentages.

JOURNAL OF
APPLIED
CRYSTALLOGRAPHY

ISSN: 1600-5767

Volume 57| Part 1| February 2024| Pages 60-70

https://doi.org/10.1107/S1600576723010403

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