Superelastic oxide micropillars enabled by surface tension–modulated 90° domain switching with excellent fatigue resistance
Yingwei Li, Kangjie Chu, Chang Liu, Peng Jiang, Ke Qu, Peng Gao, Jie Wang, Fuzeng Ren, Qingping Sun, Long‐Qing Chen, Jiangyu Li
Abstract
(BTO) micropillars that not only are superelastic but also possess excellent fatigue resistance, lasting over 1 million cycles without accumulating residual strains or noticeable variation in stress-strain curves. Phase field simulations reveal that the large recoverable strains of BTO micropillars arise from surface tension-modulated 90° domain switching and thus are size dependent, while the small energy barrier and ultralow energy dissipation are responsible for their unprecedented cyclic stability among superelastic materials. This work demonstrates a general strategy to realize superelastic and fatigue-resistant domain switching in ferroelectric oxides for many potential applications.