Simple surface nanocrystallization approach to prepare Fe3O4/Fe-phthalocyanine@Nd2Fe14B composite as an excellent absorber

Fe3O4/Fe-phthalocyanine decorated Nd2Fe14B composites (Fe3O4/FePc@Nd2Fe14B) are prepared for the improvement of the microwave absorption of absorbers. Fe3O4/Fe-phthalocyanine, obtained from the solvent-thermal method, coated with Nd2Fe14B bulks sequentially to form Fe3O4/FePc@Nd2Fe14B. The as-prepared Fe3O4/FePc@Nd2Fe14B composites are confirmed by SEM observation, XRD and EDS analysis. SEM images show that Fe3O4/FePc@Nd2Fe14B composites possess rough surfaces. The micronanostructure with nanoscale Fe3O4/FePc microspheres sticking on the surface of micro-scale Nd2Fe14B was confirmed. Due to the optimal magnetic properties of Nd2Fe14B and Fe3O4/FePc, the composites show good saturation magnetization (M-s) and coercivity (H-c). In addition, compared with that of the Nd2Fe14B, the absorption bandwidth less than -10 dB of the Fe3O4/FePc@Nd2Fe14B is obviously improved. For the N-30%, an outstanding RL value of -54.3 dB is found at 10.6 GHz with a thickness of 2.5 mm, indicating that it's expected to obtain an excellent absorber for military and civil applications by incorporating Fe3O4/FePc@Nd2Fe14B presented in this work. (C) 2018 Elsevier B.V. All rights reserved.