About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
2D Materials – Preparation, Properties, Modeling & Applications
|
| Presentation Title |
1D vdW Thin Films: Tunable Phase Transition and Memory Applications |
| Author(s) |
Yi Shuang, Daisuke Ando, Yuji Sutou |
| On-Site Speaker (Planned) |
Yi Shuang |
| Abstract Scope |
This work reports the discovery and control of a novel phase transition in one-dimensional van der Waals (1D vdW) material NbTe4. In such 1D vdW materials, atoms form strongly bonded chains along one crystallographic direction, with neighboring chains weakly coupled through vdW interactions. By tuning niobium content and thermal annealing, NbTe4 thin films transform from a metastable monoclinic phase to a stable tetragonal phase, confirmed by XRD, Raman spectroscopy, and TEM. The transition involves a shuffling displacement of atomic chain along vdW gaps and atomic rearrangements within chain structure. Using this phenomenon, we fabricated phase change memory devices that switch between low-resistance tetragonal and high-resistance monoclinic phases under electrical pulses. Joule heating induced by fast voltage pulses enable reversible transitions without amorphization, allowing stable, repeatable cycling. This electrical phase control in 1D vdW materials offers promising pathways for scalable, energy-efficient memory applications. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Electronic Materials, Phase Transformations, Thin Films and Interfaces |