化学的共沈法による高保磁力Co-Ni-Mnスピネルフェライト微粒子の諸特性(薄膜)

概要

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An experiment was carried out to investigate the effect of Mn substitution on Co-Ni spinel ferrite prepared by the chemical coprecititation method without post-annealing. The chemical coprecipitation compositions were chosen according to the formula (CoO)_<0.5>(NiO)_<0.5-y>(MnO)_y・n/2(Fe_2O_3), where y varied between 0 and 0.5 and n between 2.0 and 2.5. Optimum magnetic properties were achieved with materials whose composition was (CoO)_<0.5>(NiO)_<0.4>(MnO)_<0.1>・1.125(Fe_2O_3). The typical magnetic and physical properties are saturation magnetization σ_s=55.5×10^<-6>Wb・m/kg (44.2 emu/g), coercivity H_<cJ>=567.2 kA/m (7.12 kOe), average particle size D=43 nm, anisotropy constant K_1=+1.36×10^5 J/m^3 (+1.36×10^6 erg/cm^3), K_2=-11.3×10^5J/m^3 (-11.3×10^6 erg/cm^3), anisotropy field H_A≒3.56 MA/m (44.7 kOe). The rotational hysteresis integral Rh, which is related to the magnetization mechanism of these fine particles, is 1.62, and it was found that the magnetization mechanism is an incoherent one.
社団法人日本磁気学会の論文
2005-03-01