我国新成果有望让器件“存得更多，占得更少”

Core Viewpoint - The research team at the Chinese Academy of Sciences has developed self-supporting ferroelectric thin films with a fluorite structure and has observed and manipulated one-dimensional charged domain walls at the atomic scale using advanced electron microscopy techniques. The findings were published in the journal "Science" on January 23 [1]. Group 1: Ferroelectric Materials - Ferroelectric materials consist of tiny "electrical compass" structures that spontaneously separate positive and negative charges, indicating a direction of spontaneous polarization even without an external electric field [3]. - These materials have significant potential applications in information storage, sensing, and artificial intelligence due to their ability to attract charges from nearby materials [3]. Group 2: Domain Walls and Their Properties - In ferroelectric materials, the "compasses" are not all aligned in the same direction, leading to the formation of ferroelectric domains with consistent polarization directions, separated by domain walls [4]. - The stability of these domain walls is influenced by charge accumulation, requiring a special "glue" (charge compensation mechanism) to keep them together, which results in distinct physical properties compared to the ferroelectric domains [4]. Group 3: Research Findings - The fluorite-structured ferroelectric material ZrO2 (zirconium dioxide) presents opportunities for constructing ultra-small ferroelectric domain walls, potentially enhancing storage density [6]. - The research team discovered that these charged domain walls are confined within polar lattice layers, with dimensions on the order of angstroms, and are stabilized by excess oxygen ions or vacancies acting as "glue" [6]. - The team demonstrated the artificial manipulation of these one-dimensional charged domain walls using localized electric fields generated by electron irradiation, challenging traditional understandings of domain wall structures and providing a scientific basis for developing high-density artificial intelligence devices [6].