Magnetic transitions at high fields in (Fe,Mn)3Si alloys
Magnetic transitions at high fields in (Fe,Mn)3Si alloys
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(Fe,Mn)3Si 合金高场下的磁转变
DOI：
10.1063/1.358266
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发表时间：
1994
影响因子：
3.2
通讯作者：
J. Fernandez
中科院分区：
文献类型：
--
作者：
H. J. Al;J. Booth;J. Cable;J. Fernandez
在一系列有序的DO3固溶体Fe3−xMnxSi中，先前已经发现反铁磁合金在x值接近1.70时会发生场致相变。目前的工作已经确定了一个组成区域，其中反铁磁性是低场，低温状态，并给出了临界场的变化作为温度和组成的函数。临界场随温度近似二次下降，在1.6≤x≤1.8的范围内，临界场上升到6T以上。中子衍射表明，反铁磁轴从[111]方向偏移，在5T磁场下，散射的反铁磁分量比零磁场下明显减少。然而，在实验误差范围内没有观察到铁磁分量的相应增加，Arrott图表明高场状态仍然主要是反铁磁的。
In the series of ordered DO3 solid solutions Fe3−xMnxSi, field‐induced transitions have previously been found to occur for antiferromagnetic alloys with values of x near 1.70. The present work has determined a region of composition in which antiferromagnetism is the low‐field, low‐temperature state and gives the variation of the critical field as a function of temperature and composition. The critical field decreases approximately quadratically with temperature and rises to beyond 6 T in the range of composition from 1.6≤x≤1.8. Neutron diffraction indicates that the antiferromagnetic axis is shifted from the [111] direction and that in a 5 T field the antiferromagnetic component of the scattering is reduced considerably from that in zero field. However, no corresponding increase in ferromagnetic component is observed within experimental error and Arrott plots suggest the high‐field state is still largely antiferromagnetic.