Tunable magnetic coupling and dipole polarization of core-shell Magnéli Ti4O7 ceramic/magnetic metal possessing broadband microwave absorption properties

There are few reports on the application of Magnéli Ti 4 O 7 in the field of electromagnetic wave absorption. Herein, we designed and prepared a Ti 4 O 7 /magnetic metal composite via an electrostatic assembly with in-situ reduction reaction. This system utilized distinct magnetic coupling deriving from the subtle designed structures and magnetic-dielectric synergy. The core-shell magnetic metallic nanoparticles/oxygen deficient Ti 4 O 7 are useful microwave absorbers in terms of wide broadband, strong absorption and ultra-low filler amount. The optimal reflection loss of Ti 4 O 7 @CoNi composite was −43.6 dB at 2.5 mm, meanwhile the effective absorbing band could reach over 5.12 GHz at only a 2.7 mm thickness. The results confirm that the dependence of the electromagnetic characteristics of the absorber on the filler ratio, frequency, and absorber thickness. Therefore, this work may be beneficial in constructing core-shell structured magnetic metal/Magnéli Ti 4 O 7 composites to tune electromagnetic parameters and strengthen electromagnetic absorption.