Improved magnetic and electromagnetic absorption properties of xSrFe 12 O 19 /(1− x )NiFe 2 O 4 composites

xSrFe 12 O 19 /(1− x )NiFe 2 O 4 composites (0 ≤  x  ≤ 1.0) were synthesized by using a conventional solid‐state synthetic route. The results show that magnetic hysteresis loops of the xSrFe 12 O 19 /(1− x )NiFe 2 O 4 composites are similar to those of individual component ferrites, except for the 0.1SrFe 12 O 19 /0.9NiFe 2 O 4 and 0.3SrFe 12 O 19 /0.7NiFe 2 O 4 , suggesting that the hard/soft magnetic phases are well exchange‐coupled. The saturation magnetization, coercivity, and remanent magnetization of the xSrFe 12 O 19 /(1− x )NiFe 2 O 4 composites are increased with increasing content of SrFe 12 O 19 , with maximal values of 42.1 Am 2  kg −1 , 78.7 kA m −1 , 17.2 Am 2  kg −1 , respectively, as the content x is about 0.5. They are higher than those of the individual components, implying that interface coupling is present in the magnetic composites. The coercivity and remanent magnetization of the composites are increased initially with increasing sintering temperature and then show a downward tendency. For the component SrFe 12 O 19 and NiFe 2 O 4 , the minimum reflection losses are −12.5 dB and −18.3 dB at match thicknesses of 2.5 mm and 2 mm, respectively. Compared with those of the component SrFe 12 O 19 and NiFe 2 O 4 , the microwave absorption performances of the xSrFe 12 O 19 /(1− x )NiFe 2 O 4 composites are improved remarkably, especially for the samples of x  = 0.3 and x  = 0.9. The minimum reflection losses values of the 0.3SrFe 12 O 19 /0.7NiFe 2 O 4 composite are −31.6 dB (12.7 GHz) and −20.2 dB (13 GHz), while those of the 0.9SrFe 12 O 19 /0.1NiFe 2 O 4 composites are −23.7 dB (16.3 GHz) and −33.5 dB (15.8 GHz), as the matching thicknesses are 2.5 mm and 2 mm, respectively. Therefore, the xSrFe 12 O 19 /(1− x )NiFe 2 O 4 composites could be used as potential microwave absorption materials.