Dual‐Driven Interface Programming via Molecular Anchoring and Entropy Order for Efficient Dielectric‐Magnetic Synergy and Robust Microwave‐Absorption

ABSTRACT A superior dielectric and magnetic synergy in a conventional microwave absorber is always restained by sharp structural transitions across the heterointerfaces. Here, a Dual‐Driven programming strategy is proposed to reconstruct the heterointerfaces in entropy regulated biomass derived materials. Metal organic complexes are first anchored onto modified bamboo fibers. This step confines metal elements within localized interfacial regions and establishes a stable spatial basis for subsequent entropy evolution. During thermal treament, the interfacial elements follow differentiated pathways. Fe, Co, and Ni tend to nucleate locally and disperse along the interface, whereas Cr and, in the quinary system, Mn are more broadly distributed within the carbon matrix. Owing to a more balanced electromagnetic response, Fe 50 Co 30 Ni 15 Cr 5 ‐BFC shows weak thickness dependence of its effective absorption bandwidth, maintaining 4.0–4.5 GHz across a thickness range from 1.8 to 3.1 mm. Thermal aging tests and CST simulations further indicate stable performance under resin curing conditions, alongside a theoretical trend of multi‐angle adaptability. These features suggest promising engineering value and process compatibility. This study validates the advantages of the Dual‐Driven programming strategy and offers a reliable design route for next‐generation heterogeneous microwave absorbers.