摘要
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 temperature dependence of magnetic susceptibility and electricresistivity of non-magnetic steel 30Mn 20 Al3 was examined.A paramagetic-antiferromagnetic transition about 284K is found and a peak value is presentedat the X-T plot.Below the Néel temperature T_N,the magnetic resistivityincreases up to show a negative temperature coefficient by antiferromagneticordered scattering,an anomalous resistivity increases with decreasing tempera-ture.In addition,30Mn20Al_3 steel is different from single paramagnet in thatmagnetic permeability μ slightly decreases with increasing of magnetic field in-tensity H.
基金
国家自然科学基金
5870006
关键词
无磁钢
磁化率
电阻率
磁导率
non-magnetic steel
magnetic susceptibility
resistivity
permeability
paramagnetic-antiferromagnetic transition
