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研究了一种新无磁钢30Mn20Al3的磁化率(χ)和电阻率(ρ)与温度(T)的关系及相对磁导率(μ)随外磁场强度(H)的变化。30Mn20Al3无磁钢在 Néel 温度 T_N(～284K)发生顺磁-反铁磁性转变,χ-T 曲线呈现峰值。由于反铁磁有序对传导电子的散射产生磁性电阻,电阻温度系数变为负值,电阻随温度的下降而反常增大。30Mn20Al3不同于单纯的顺磁体,其μ值随 H 的增大而略有减小。
The relationship between magnetic susceptibility (χ), resistivity (ρ) and temperature (T) of a new non-magnetic steel 30Mn20Al3 and the change of relative permeability (μ) with the intensity of external magnetic field (H) The paramagnetism-antiferromagnetic transition of 30Mn20Al3 nonmagnetic steel occurs at the Néel temperature T_N (~ 284K), and the χ-T curve shows a peak value. Due to the antiferromagnetic order of the scattering of conductive electrons to produce magnetic resistance, the temperature coefficient of resistance becomes negative, the resistance increases abnormally with decreasing temperature. 30Mn20Al3 is different from pure paramagnetic. Its μ value decreases slightly with the increase of H.