Abstract
The synthesis and characterization of Ba0.6Sr0.4Fe12O19/LaMnO3 composite material has been successfully carried out by mechanical alloying method using high energy milling. Crystal structure and surface morphology were characterized using x-ray diffraction and scanning electron microscopy. While the value of magnetization and the ability to absorb microwaves, vibrating sample magnetization and vector network analyzing were used, respectively. With variations in weight, does not change the crystal structure. The Ba0.6Sr0.4Fe12O19phase has a hexagonal structure and the LaMnO3 phase has an orthorhombic structure. Surface morphology has a heterogeneous size in the range of 200-450 nm with the form of platelets. The composite material Ba0.6Sr0.4Fe12O19/LaMnO3 is a hard-soft magnetic material with a magnetic saturation of Ms ~ 46.83 emu/g, Mr ~ 28.8 emu/g, and a coercive field of Hc ~ 3.88 kOe. The minimum reflection loss value is – 13.0 dB at 11.2 GHz frequency and 1.52 GHz bandwidth.
Highlights
IntroductionAt room temperature type-M hexaferrite material is hard magnetic, has high magnetic saturation Ms, wide Hc coercivity field, strong uniaxial magnetic anisotropy, high curie temperature, and good chemical stability
Hexaferrite-based materials, especially M-type hexaferrite (MFe12O19, M = Ba or Sr) are still a concern of researchers [1,2,3]
To increase the capability of M-type hexaferrite material as a microwave absorber, several methods were carried out, for example combining Ba2+ and Sr2+ ions (Ba1-xSrxFe12O19) [6], substituting Mn2+ ions on Fe3+ ions (Ba0.6Sr0.4Fe12-zMnzO19) [4], making hexaferrite composites with perovskite (SrFe12O19–La1-xSrxMnO3) [7], BaFe12O19-NiFe2O4 composites [8], or making multiple layers consisting of BaFe12O19-BaCoZnFe10O19 composites [9]
Summary
At room temperature type-M hexaferrite material is hard magnetic, has high magnetic saturation Ms, wide Hc coercivity field, strong uniaxial magnetic anisotropy, high curie temperature, and good chemical stability. This material is very applicable in technology, for example as a recording medium [1], ceramic color pigments [2], photocatalysts [3], and microwave absorbers at a frequency of 8-12 GHz [4]. To increase the capability of M-type hexaferrite material as a microwave absorber, several methods were carried out, for example combining Ba2+ and Sr2+ ions (Ba1-xSrxFe12O19) [6], substituting Mn2+ ions on Fe3+ ions (Ba0.6Sr0.4Fe12-zMnzO19) [4], making hexaferrite composites with perovskite (SrFe12O19–La1-xSrxMnO3) [7], BaFe12O19-NiFe2O4 composites [8], or making multiple layers consisting of BaFe12O19-BaCoZnFe10O19 composites [9]
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