ANTIFERROMAGNETISM OF GAMMA FE-MN ALLOYS
ANTIFERROMAGNETISM OF GAMMA FE-MN ALLOYS
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DOI：
10.1143/jpsj.21.1281
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发表时间：
1966-01-01
影响因子：
1.7
通讯作者：
ISHIKAWA, Y
中科院分区：
文献类型：
--
作者：
UMEBAYASHI, H;ISHIKAWA, Y
用磁天平、灵敏转矩磁强计和中子衍射研究了Mn含量在20 ~ 50at%之间的无序γ Fe-Mn合金的多晶和单晶样品的反铁磁性。Mn含量为20 ~ 27at%的合金在与磁性转变相同的温度范围内发生ε-Participy-γ转变。研究了磁性转变与晶体学转变之间的关系，得到了该成分区的Fe-Mn合金相图。单晶样品的中子衍射研究证实了Kouvel和Kasper的粉末中子衍射研究提出的广义反铁磁自旋结构。对在强磁场中通过内尔点冷却的单晶进行的扭矩测量表明，自旋结构本质上是立方的，四个子晶格上的自旋指向不同的立方对角线。结果进行了讨论的观点的分子场理论的基础上本地化的电子模型。然而，Néel点以下和以上的磁化率的温度依赖性不能基于局域电子模型来解释，尽管后者可以解释所提出的自旋结构。
The antiferromagnetism of polycrystalline and single crystal samples of disordered γ Fe-Mn alloys containing between 20 to 50 at% Mn was investigated by means of a magnetic balance, a sensitive torque magnetometer and neutron diffraction. The alloys with 20 to 27 at% Mn exhibited ε↔ γ trans-formation in the same temperature range as the magnetic transformation. The relation between the magnetic and the crystallographic transformations was investigated and a phase diagram of Fe-Mn alloys in this composition region was obtained. A neutron diffraction study of single crystal samples confirmed the generalized antiferromagnetic spin structure proposed by the powder neutron diffraction study of Kouvel and Kasper. The torque measurements, made on single crystals which had been cooled through the Néel point in a strong magnetic field, indicated that the spin structure is intrinsically cubic, the spins on the four sublattices being directed toward the different cube diagonals. The results are discussed from the viewpoint of a molecular field theory based on the localized electron model. However, the temperature dependence of the susceptibility below and above the Néel point cannot be interpreted on the basis of a localized electron model, although the latter can account for the proposed spin structure.