Yan Cheng Zhaomeng Gao Kun Hee Ye Hyeon Woo Park Yonghui Zheng Yunzhe Zheng Jianfeng Gao Min Hyuk Park Jung-Hae Choi Kan-Hao Xue Cheol Seong Hwang Hangbing Lyu 2024-01-19T13:00:25Z 2024-01-19T13:00:25Z 2022-02-17 2022-02 2041-1723 https://pubs.kist.re.kr/handle/201004/115774 Atomic-resolution Cs-corrected scanning transmission electron microscopy revealed local shifting of two oxygen positions (OI and OII) within the unit cells of a ferroelectric (Hf0.5Zr0.5)O2 thin film. A reversible transition between the polar Pbc21 and antipolar Pbca phases, where the crystal structures of the 180° domain wall of the Pbc21 phase and the unit cell structure of the Pbca phase were identical, was induced by applying appropriate cycling voltages. The critical field strength that determined whether the film would be woken up or fatigued was ~0.8 MV/cm, above or below which wake-up or fatigue was observed, respectively. Repeated cycling with sufficiently high voltages led to development of the interfacial nonpolar P42/nmc phase, which induced fatigue through the depolarizing field effect. The fatigued film could be rejuvenated by applying a slightly higher voltage, indicating that these transitions were reversible. These mechanisms are radically different from those of conventional ferroelectrics. ？ 2022, The Author(s). English Nature Publishing Group Reversible transition between the polar and antipolar phases and its implications for wake-up and fatigue in HfO2-based ferroelectric thin film Article 10.1038/s41467-022-28236-5 1 Nature Communications, v.13, no.1 Nature Communications 13 1 Y scie scopus 000752207900018 2-s2.0-85123974122 Multidisciplinary Sciences Science & Technology - Other Topics Article TOTAL-ENERGY CALCULATIONS FIELD-CYCLING BEHAVIOR HAFNIUM OXIDE POLARIZATION ferroelectric Reversible transition HfO2 wake-up fatigue