论文部分内容阅读
测量了自旋密度波材料 Ｃｒ７５ Ｆｅ１６ Ｍｎ９ 的低频内耗，实验温区为１００ —６００ Ｋ，测量频率低于１０ Ｈｚ ．在高于 Ｎéｅｌ 温度的顺磁相中观察到４５０ Ｋ 附近的内耗峰和相应的总模量的跳变，反映了合金中各组分的自旋状态在微区内的无序有序转变．在２００ —３００ Ｋ 之间观察到一个宽的内耗峰区，它是由２８０ Ｋ 的单峰和２７０ —２２０ Ｋ 延展的宽峰组成，其相对应的总模量表现为宽范围的少量减小．此宽峰可能与该合金中自旋密度波反铁磁转变以及磁多相共存有关．实验表明，内耗在探测固体中包括电子结构在内的微结构的改变中将是灵敏和有效的．
The low frequency internal friction of the spin-density wave material Cr75Fe16Mn9 was measured. The experimental temperature range was 100-600 K and the measurement frequency was lower than 10 Hz. The transition of internal friction peak near 450 K and the corresponding total modulus was observed in the paramagnetic phase above the Néel temperature, which reflects the disorder-ordered transition of the spin states of the components in the micro-zone . A broad internal friction peak is observed between 200 and 300 K, consisting of a broad peak of 280 K and a broad peak of 270-220 K, with a corresponding total modulus exhibiting a small, wide range of decreases . This broad peak may be related to the antiferromagnetic transition of spin-density wave and the coexistence of magnetic multiphase in this alloy. Experiments have shown that internal friction will be sensitive and effective in detecting microstructural changes in solids, including electronic structures.