Mn添加Sm_2Fe_<17>N_χ系材料の磁気特性と微細構造

概要

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The magnetic properties and microstructure of Sm_2(Fe_<0.95>Mn_<0.05>)_<17>N_χ and Sm_2(Fe_<0.84>Co_<0.11>Mn_<0.05>)_<17>N_χ powders were investigated. It was found by high-field magnetization measurement in steady fields of up to 150 kOe that the intrinsic saturation magnetizations of Sm_2(Fe_<0.95>Mn_<0.05>)_<17>N_χ and Sm_2(Fe_<0.84>Co_<0.11>Mn_<0.05>)_<17>N_χ with χ=3.3-5.5 were 130-160 emu/g. The theoretical (BH)_<max> value for Sm_2(Fe_<0.95>Mn_<0.05>)_<17>N_<3.3> is calculated to be about 60MGOe (ρ=7.70g/cm^3, M_5=15.5kG). The anisotropy fields of Sm_2(Fe_<0.95>Mn_<0.05>)_<17>N_χ and Sm_2(Fe_<0.84>Co_<0.11>Mn_<0.05>)_<17>N_χ powders were estimated to be 140-170 kOe by extrapolation of the magnetization curves. From TEM observations, it was found that the Sm_2(Fe_<0.95>Mn_<0.05>)_<17>N_<5.5> powder had a cell structure consisting of the crystals about 10nm in diameter. It is concluded that the magnetic reversal of Sm_2(Fe_<0.95>Mn_<0.05>)_<17>N_<5.5> powder is pinning-controlled, judging from the microstructure and the relationship between the coercivity and the maximum applied field.
社団法人日本磁気学会の論文
1998-04-15