Synergistic Magnetoelectric Janus Films With Hierarchical Interfaces for High‐Efficiency EMI Shielding and Multimodal Thermal Management

The development of flexible wearable films integrating high electromagnetic interference (EMI) shielding effectiveness (SE), multimodal thermal management, and adaptability to complex environments remains a major challenge. Herein, a multifunctional asymmetric ultrathin film composed of a silver nanowires (AgNWs)/waterborne polyurethane (WPU) layer, FeCoNi/polyacrylonitrile‌ fibrous layer, and FeCo@Ti 3 C 2 T x /WPU layer was successfully fabricated through electrospinning combined with a layered blade‐coating strategy. The AgNWs network and FeCo@Ti 3 C 2 T x magnetoelectric coupling yielded an average EMI SE of 78.17 dB, with absorption as the primary shielding mechanism (SE A /SE T = 93.61%). Furthermore, stable dual‐mode electrothermal/photothermal was achieved by exploiting the high conductivity of AgNWs and the excellent photothermal conversion capability of FeCo@Ti 3 C 2 T x . Saturated temperatures of 120.1°C and 76.4°C were reached under a voltage of 1.0 V and light irradiation of 300 mW cm −2 , respectively, accompanied by rapid thermal response and excellent cycling stability. Notably, typical Janus wettability characteristics were also observed, with water contact angles of 70.27° and 122.22° on the two sides. The film demonstrates significant integrated advantages in electromagnetic protection, intelligent thermal management, and complex‐environment adaptability, providing a feasible pathway for the practical development of next‐generation intelligent flexible wearable electronics.