Investigation of Magnetic and Electromagnetic Properties of Cobalt Substituted M-type Barium Hexaferrite in X-band.

Abstract

In the present investigation, the magnetic and electromagnetic character of cobalt substituted M-type barium hexaferrite with composition BaCoxFe12-xO19 (x = 0.0 to1.0 in the steps of 0.2) by co-precipitation method has been studied. After the appropriate heat treatments, the structural, magnetic and electromagnetic properties at X band ranging from 8-12 GHz are thoroughly examined. XRD confirmed the formation of M phase and revealed that with an increase in the content of cobalt ions the average crystallite size is found to be increased from 28 to 45 nm whereas the morphology examined from FESEM and TEM confirmed the formation of high quality and densely packed nano ferrites. From all the six samples the composition BaCo0.8Fe11.2O19 exhibit remarkable magnetic and electromagnetic properties and found to be one of the best compositions. For this particular composition very higher value of coercivity of the order of 3789 Oe along with good saturation magnetisation value of 65 emu/g is observed. Similar kinds of results are observed form electromagnetic properties of the same composition. Again the composition BaCo0.8Fe11.2O19 showed some excellent and sustainable values of complex permittivity and tangent losses i.e 11, 0.024 and 0.035. So based on the magnetic and electromagnetic performances, the composition BaCo0.8Fe11.2O19 may emerge as an ideal candidate for high-speed recording, permanent magnet applications, microwave absorption at high-frequency applications ranges from 8-12 GHz and many more.