Superelastic Magnetic Aerogel Valve Modulates Infrared‐Radar Stealth

The transparency of modern battlefields, dominated by multispectral surveillance, demands adaptive camouflage that can dynamically evade both infrared and radar detection. However, the fundamental conflict between the high electromagnetic loss required for radar stealth and the low emissivity essential for infrared stealth has long impeded progress toward such intelligent and compatible systems. Herein, we break this limitation through superelastic magnetic nanofiber aerogels (MNFAs) featuring a semi‐honeycomb cellular architecture. Such a design enables on‐demand, synchronous switching between “on” and “off” states for dual‐band stealth, while maintaining outstanding mechanical robustness, as evidenced by stable performance over 500 compression cycles at 50% strain. In the released state, the MNFAs exhibit exceptional radar wave absorption (reflection loss of –42 dB) and outstanding thermal insulation (the thermal conductivity of 51 mW m −1 K −1 ), providing simultaneous stealth against both spectra. Upon 70% compressive strain, the effective absorption bandwidth vanishes while the surface temperature rises dramatically, simultaneously disabling both the radar and infrared stealth functions. This study elucidates the mechanism of mechanically driven multispectral synergistic intelligent regulation through multi‐scale analysis, providing a new paradigm for the design of next‐generation adaptive camouflage materials.