Magnetic and microwave absorption properties of ZnCo-substituted W-type strontium hexaferrite

• Single phase SrZn2−xCoxFe16O27 (x=0–2.0) hexaferrites were prepared by ceramic conventional method.
• The saturation magnetization increases up to a maximum of 72.8 emu/g for SrZnCoFe16O27, and then decreases.
• The coercivity decreases from 1000 Oe for x=0 to 430 Oe for x=1 and then increases up to 700 Oe for x=2.
• SrZn2−xCoxFe16O27 hexaferrite exhibited the maximum absorption of −28 dB at 10.3 GHz.

Single phase ZnCo-substituted W-type strontium hexaferrite (SrZn2−xCoxFe16O27 with x=0–2.0) were prepared by ceramic conventional method. With the Co substitution, the saturation magnetization increases up to a maximum of 72.8 emu/g for SrZnCoFe16O27, and then decreases, while the coercivity decreases from 1000 Oe for x=0 to 430 Oe for x=1 and then increases up to 700 Oe for x=2. The microwave absorption measurements in the microwave frequency range of 8–12 GHz (X-band) exhibited the maximum absorption of −28 dB at 10.3 GHz with an absorption bandwidth of more than 2.1 GHz for x=1.