Magnetism is a classical topic in the new field of nanomaterials and can be integrated easily. Electrospinning is a means of preparing continuous nanofibers, which can be applied for large-scale...

Flexible inorganic functional materials have received extensive attention in recent years due to their unique properties and potential application prospects. Among various flexible materials, ceramic fiber membranes have great application prospects due to their functional original structure. Unlike other materials, such as one-dimensional flexible ice, two-dimensional BaTiO 3 , and threedimensional α-Ag 2 S, ceramic fiber membranes are high-performance materials with a functional unit structure. In the field of electrospinning, electrospinning technology can effectively control the microstructure of ceramic fibers, allowing for multileveled structure design, such as ordered electrospinning technology and disordered electrospinning technology, which can effectively control the functional primitive structure. However, the mechanical behavior of these structures is still poorly understood. In this groundbreaking study, we investigated the functional original structure of CaTiO 3 :Eu 3+ electrospinning fiber membranes from the bottom-up and explored the effect of grain diameter ratio on mechanical behavior and studied the effect of Eu 3+ ions on the luminescent properties of CaTiO 3 functional fiber membranes. By controlling the electrospinning parameters and avoiding inherent mechanical property differences between the microcrystals, we realized the stress concentration design from the perspective of functional element structure. Our results show that the stress concentration design at the bottom of the multileveled structure significantly affects