(Fe_1-xNi_x)₇₇Si₁₀B₁₃非晶質合金のスピン−グラス

抄録

The magnetic phase diagram was determined for amorphous (Fe_1-xNi_x)₇₇Si₁₀B₁₃, 0.8≤x≤1, alloys by measuring the temperature dependence of ac susceptibility χ_ac. The magnetic field dependence of χ_ac was studied for an amorphous (Fe_0.1Ni_0.9)₇₇Si₁₀B₁₃ alloy to clarify the origin of the inflection in χ_ac-T curve observed at low temperatures. The field dependence of χ_ac was analyzed into linear susceptibility χ₀ and nonlinear susceptibility χ₂. The value of χ₀ and χ₂ exhibited an inflection and a peak at T_f, respectively. The physical properties such as saturation magnetization, magnetic anisotropy and electrical resistivity changed smoothly at T_f while the coercive force began to increase at T_f with decreasing temperature. The origin of the inflection in χ_ac-T curve at T_f was discussed by taking into account the increase of the magnetic anisotropy of the assumed magnetic clusters.