Core–sheath FeCo@vertically aligned carbon fiber arrays for integrated ultrahigh through-plane thermal conductivity and absorption-dominant electromagnetic interference shielding

and 41.6 dB, respectively, while the reflection effectiveness was only 1.5 dB. This work demonstrates that the FeCo@VACF/PDMS composite can simultaneously achieve ultrahigh through-plane thermal conductivity and absorption-dominant EMI shielding, providing a novel approach for designing high-performance, multifunctional thermal interface materials.