Theoretical saturation magnetization and magnetocrystalline anisotropy energy ͑MAE͒ of -phase ͑face-centered tetragonal͒ Mn 50 Al 50 alloy were obtained by first principles calculations, and the alloy was fabricated to compare the experimental values with the theoretical predictions. The calculated magnetic moment and MAE for -phase Mn 50 Al 50 were 2.37 B / f.u. and 0.259 meV/f.u. ͑1.525ϫ 10 6 J / m 3 ͒, respectively, which result in the maximum energy product ͑BH͒ max of 12.64 MG Oe and the magnetocrystalline anisotropy field of 38 kOe. The saturation magnetization for -phase Mn 54 Al 46 alloy was measured to be 98.3 emu/g, which gives 4.7 MG Oe of ͑BH͒ max . The magnetization is about 70% of the theoretical value of 144 emu/g.
Magnetic properties of sol-gel and conventional ceramic processed Ba3Co2Fe2O41 hexaferrite were investigated and compared for terrestrial digital multimedia broadcasting (T-DMB) antenna application. All of the synthesized powder and sintered body showed almost single Z-phase. The loss tan δ of sol-gel processed and sintered Co2Z hexaferrite was 0.010 at 200 MHz, while conventional ceramic processed and sintered Co2Z showed 0.068. The ωd (resonance frequency of domain wall) and ωs (resonance frequency of spin components) of sol-gel and ceramic processed hexaferrites were estimated to be 10 and 1160 MHz and 17 and 1025 MHz, respectively. The frequency difference between ωd and ωs (1150 MHz) for the sol-gel processed hexaferrite is wider than that (1008 MHz) for the ceramic processed hexaferrite. The permeabilities of sol-gel and ceramic processed hexaferrites were 6.91 and 9.23 at 200 MHz, respectively. Both permeabilities are higher than 6.88 and 7.64 of corresponding permittivities at the same frequency, respectively. It is found that the sol-gel processed and sintered Z-type hexaferrite meet desired low-loss tan δ and broadband for T-DMB antenna.
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