| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances and Discoveries in Non-equilibrium Driven Nanomaterials and Thin Films
|
| Presentation Title |
Transient Laser Heating Induced Nanoscopic Surface Reconstruction in VO2 Thin Film |
| Author(s) |
Soumya Mandal, Adele Moatti, Jagdish Narayan, Ritesh Sachan |
| On-Site Speaker (Planned) |
Soumya Mandal |
| Abstract Scope |
This work presents a detailed study on atomic rearrangements and structural transformations via ultrafast melting and quenching in VO2 thin film by nanosecond pulsed laser irradiation. Using atomic-resolution electron microscopy, we observe that laser irradiation induces a surface reconstruction in VO2. Interestingly, the change in stoichiometry-induced orbital occupancy causes the reduction in relative resistivity of recrystallized VO2 by one order of magnitude. By performing atomic distance mapping with atomic-resolution images, we estimate ~0.031 nm and ~0.013 nm atomic displacement as compared to the pristine lattice along the out-of-plane and in-plane direction, respectively. Electron energy-loss spectroscopy analysis confirms the shift in O-K and O-prepeak and change in V-L2,3 ratios (~1.06 to 1.12) across the interface. These results explain the systematic modification of orbital occupancy, which attributes to the metallic characteristics in VO2. Overall, this study offers a critical understanding of structure-property correlations in VO2 through surface modification via pulsed laser irradiation. |
| Proceedings Inclusion? |
Planned: |