$Mn_{0.05}Mg_{11.9-2x}Fe_{4x}O_{4+r}$+2wt%$Al_{2}O_{3}$ 조성내 Fe량 변화에 따른 마이크로파 손실 특성 연구

A study on the properties of microwave loss of ferrite with various Fe contents in $Mn_{0.05}Mg_{11.9-2x}Fe_{4x}O_{4+r}+2wt%$Al_{2}O_{3}$

In order to study the effect of D.C resistivity of sample on electromagnetic loss of ferrite at microwave frequency, samples were prepared for having differences in resistivity of an order of two. Microwave permeability($\mu$), permitivity($\varepsilon$) and effective linewidth(${\Delta}H_{eff}$), and ferromagnetic resonance linewidth(${\Delta}$H) were characterized. Tan${\delta}{\mu}$, tan${\delta}{\varepsilon}$ and ${\Delta}H_{eff}$ were decreased with increasing the resistivity and (${\Delta}$H) was increased with increasing Fe concentration, which was due to an increase of anisotropy magnetic field (=Ha).