• Proceedings of the Korean Magnestics Society Conference
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• 2014.05a
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• pp.122-124
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• 2014

• Proceedings of the Korean Vacuum Society Conference
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• 2009.02a
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• pp.173.1-173.1
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• 2009

• Proceedings of the Korean Magnestics Society Conference
• /
• 2009.05a
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• pp.92-92
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• 2009

• Proceedings of the Korean Magnestics Society Conference
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• 2013.12a
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• pp.113-113
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• 2013

• Proceedings of the Korean Magnestics Society Conference
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• 2008.12a
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• pp.66.2-66.2
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• 2008

• Korean Journal of Materials Research
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• v.13 no.6
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• pp.365-368
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• 2003

Small amounts of additives such as mol % 0.13 NiO and mol % 0.01 $CaCO_3$were added to Cu-Zn-Mg ferrites. Basic composition of the Cu-Zn-Mg ferrites was $Cu_{Cu}$X/$Fe_{0.054}$ /$Zn_{0.486}$$Mg_{0.407}$ $Fe_{1.946}$ $O_4$(group A) and $Cu_{0.263}$$Fe_{0.027}$ $Zn_{0.503}$ $Mg_{0.262}$ $Fe_{1.973}$ $O_4$(group B). Specimens were sintered at different temperatures (1010, 1030, $1050^{\circ}C$) for 2 hours in air followed by an air cooling. Then, effects of various composition and sintering temperatures on the microstructure and the magnetic properties such as inductions, coercive forces, and initial permeabilities of the Cu-Zn-Mg ferrites were investigated. The average grain size increased with the increase of sintering temperature. The magnetic properties obtained from the aforementioned Cu-Zn-Mg ferrite specimens were 1,724 gauss for the maximum induction, 1.0 oersted for the coercive force, and 802 for the initial permeability. These magnetic properties indicated that the specimens could be utilized as the core of IFT (intermediate frequency transformer) and antenna in the amplitude modulation.

• Proceedings of the Korean Magnestics Society Conference
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• 2017.05a
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• pp.106-107
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• 2017

• Proceedings of the Korean Magnestics Society Conference
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• 2013.05a
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• pp.55-56
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• 2013

• Proceedings of the Korean Magnestics Society Conference
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• 2011.06a
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• pp.25-26
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• 2011

• Journal of Magnetics
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• v.21 no.1
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• pp.61-64
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• 2016

In this study, we report the as-prepared MgO-doped $BaFe_{12}O_{19}$, which was prepared by calcination technique and high-energy ball milling process, as an electromagnetic wave absorber. The phase analysis of $BaFe_{12}O_{19}$ and the as-prepared MgO-doped $BaFe_{12}O_{19}$ was detected utilizing X-ray Diffractometer (XRD). The microstructure was characterized using Scanning Electron Microscope (SEM). By means of the transmission/reflection coaxial line method, the electromagnetic properties and microwave absorbing properties of the as-prepared electromagnetic wave absorber were studied. It is found that the electromagnetic wave absorber has a minimum reflection loss value of -41 dB at 4.27 GHz with a matching thickness of 2.6 mm. The experiment results revealed that the as-prepared electromagnetic wave absorber could find potential applications in many military as well as commercial industries.