Abstract
Mg1.3-xMnxAlyFe1.8-yO4 (x = 0.1–0.2, y = 0.15–0.3) spinel ferrites were prepared using conventional ceramic technique. Highly densified Mg–Mn–Al ferrites (with 99% theoretical density) were obtained, and the influence of Mn and Al substitution on the characteristics of these ferrites has been systematically studied. The microstructure, magnetic properties, and ferromagnetic resonance linewidth (ΔH) of the Mg–Mn–Al ferrites have been analyzed by X-ray diffraction, B-H analyzer, and ferromagnetic resonance (FMR) spectrometer. The results showed that all of the samples were single spinel phase. As Mn content increases and Al content decreases, both saturation magnetization (4πMs) and squareness ratio increase, while the coercivity (Hc) first increases and then decreases. In addition, good ferromagnetic resonance linewidth properties were also obtained as 143.8 Oe at 9.3 GHz for the sample with x = 0.17 and y = 0.20. The results imply that Mg1.3-xMnxAlyFe1.8-yO4 ferrites may be applicable for X-band (8–12 GHz) microwave devices.
Highlights
A ferrite material is a type of ceramic compound that consists of iron oxide and one or more other metals in a chemical combination
Each type of microwave device was developed by using the gyromagnetic effect, nonlinear effect, and unique electromagnetic characteristics of the microwave ferrite under a magnetic field and microwave signal.[4,5]
The X-ray diffractometer (XRD) patterns of all the samples exhibit a well-defined reflection without any extra phases and shows the formation of a single-phase spinel structure
Summary
A ferrite material is a type of ceramic compound that consists of iron oxide and one or more other metals in a chemical combination. Ferrites are typically used in microwave applications for various non-reciprocal devices such as isolators, circulators, diplexers, filters, and phase shifters.[1,2,3] Each type of microwave device was developed by using the gyromagnetic effect, nonlinear effect, and unique electromagnetic characteristics of the microwave ferrite under a magnetic field and microwave signal.[4,5] The properties of microwave ferrite were improved through appropriate chemical substitution to achieve different band demands. An Mg–Mn–Al composite microwave ferrite, which performed excellently was obtained, and is applicable to the X-band latching phase shifter devices
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