Ferroelectric hafnia occurs only in a thin-film orthorhombic phase that needs wake-up cycling to induce ferroelectricity. Here, by growing thin-film Hf0.5Zr0.5O2 under strain, a polar rhombohedral phase is achieved that does not require cycling.
- Yingfen Wei
- Pavan Nukala
- Beatriz Noheda
