Preparation and microwave absorption properties of barium ferrite nanorods

Barium hexaferrite nanorods were successfully prepared using a sol-gel technique with polymethylmethacrylate as a template. The magnetic nanorods with diameters about 60nm and lengths about 300nm are visible from FESEM images. The electromagnetic parameters of BaFe12O19 with different shapes were measured with vector network analyzer at 5-15GHz. The results show that the microwave absorption properties of rod-shaped BaFe12O19 are better than that of granular BaFe12O19. The reflection loss values less than -20dB were obtained in the frequency of 7.36-10.56GHz on rod-shaped BaFe12O19 wax composites, with thickness of 2.84-1.68mm respectively. A minimum reflection loss of -42.2dB was observed at 8.0 GHz with a thickness of 2.48mm. (C) 2007 Elsevier B.V. All rights reserved.