DEVELOPMENT AND CHARACTERIZATION OF MAGNETIC MATERIAL BARIUM HEXAFERRITE FOR MICROWAVE ABSORPTION

Abstract

Ferrite is widely known as a material which is used as hard magnet for various applications such for magnetic data storage, computer, radio wave tools, television and microwave. In addition, ferrite is also used as electromagnetic impedance (EMI) particularly for the ultra high frequency. This research develops Type-M hexaferrite as an absorbing material through nanostructure engineering by thr method of mechanical milling route. The formation of phase BaFe12-2x(MnTi)xO19 (x varies from 0.0 to 2.5) is through a two-stage mechanism which starts with the formation of (Fe, Mn, Ti)2O3. The synthetic result is tested by X-ray Diffraction and TEM to determine its structure and formation phase. Meanwhile, the magnetic characteristic is tested by permeagraph in saturating field of up to 2.15 Tesla. Network Analyzer (1 GHz to 6 GHz) is used to compute the reflection loss in that range of frwquency. Formation through a two stage mechanism occurs perfectly at the temperature of 1200 C. The Synthetic result shows that the partial substitution of Fe+3 ions with Mn+2 ions and Ti+4 influences the change in lattice parameter from c = 23.2093 nm to c = 22.8146 nm, meanwhile the value of a tends to be constant. The research result shows that there is a change in magnetic properties particularly coercivity which significantly decreases as the number of Mn+2 and Ti+4 ions increase. Besides, there is a shift in resonance microwave absoroption in the frequency range I GHz to ~ 4GHz and it is characterized as multiband.