Dynamically assembled magnetic nanoparticles in a phase transitional matrix for reconfigurable electronics.

The structure of an electronic device is predetermined at its birth, necessitating new designs and fabrication processes for alternative functions. The advent of reconfigurable electronics, modifying its circuits after manufacture, has unlocked the potential for devices to perform adaptive roles as needed. However, the trade-off between the degree of freedom to reform its structure and electrical stability restricts its potential roles, diminishing the system's significance. Here, we present a reconfigurable assembly of magnetic nanoparticles in a phase transitional matrix (RAMP) system capable of seamlessly transforming their structure with robust electrical junctions. Nanoparticles form conductive percolation under a precisely patterned magnetic field. Within a phase transitional matrix, junctions between nanoparticles are tightened, enhancing electrical performance during transitions. We demonstrated in situ electrical switching and high-resolution alternating current electroluminescence display using the RAMP system. With enhanced reconfigurability and electrical reliability, we anticipate that the RAMP system will suggest a previously unexplored approach to on-demand electronics.