The Effect of High Magnetic Field on Electromagnetic Response and Microwave Absorption of Cobalt Particles During Annealing Process
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The effect of high magnetic field on microwave absorption of cobalt particles, dispersed uniformly in a paraffin matrix, was investigated in microwave range of 2–18 GHz. The high magnetic field during annealing process could significantly improve the dielectric loss of cobalt particles. The maximum reflection loss of the cobalt particles annealed in high magnetic field is −25.00 dB while the coating thickness is 2.5 mm, which is raised by 62.87 % compared with the ones annealed without high magnetic field. The enhancement in microwave absorption may be ascribed to the improved dielectric loss of cobalt particles induced by high magnetic field.
KeywordsMicrowave absorption Permeability Permittivity Cobalt particles
The authors thank Yunfei Xue for his help and useful discussion. This work was supported by Postdoctoral Science Foundation of China (2015M581169), the Beijing Training Project for the Leading Talents in S & T (Grant No. Z151100000315001) and Youth Innovation Promotion Association of CAS (2014123).
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