Cr_(75)Fe_(16)Mn_9合金的低频内耗  

LOW\|FREQUENCY INTERNAL FRICTION IN Cr 75 Fe 16 Mn\-9 

作　　者：吴柏枚[1] 杨东升[1] 盛松[1] 刘卫[2] 徐未名[3] 

机构地区：[1]中国科学技术大学物理系,合肥230026 [2]中国科学技术大学内耗与固体缺陷开放研究实验室,合肥230026 [3]中国科学院北京低温技术实验中心,北京100080

出　　处：《物理学报》1999年第8期1503-1508,共6页Acta Physica Sinica

基　　金：高等学校博士学科点专项科研基金

摘　　要：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 in Cr 75 Fe 16 Mn 9 alloy has been measured in temperature range of 100—600?K and at frequencies lower than 10?Hz. It is found that an internal fraction peak at 450?K and corresponding jump of modules exist in the paramagnetic phase.This indicates there is a disorder\|order transition on coupling states between individual spins for the Cr and Fe components. There is a broad internal friction peak in the temperature range from 200 to 300?K,which consists of a peak at 280?K and the extended broad peak at 220—270?K. We suggest that this effect is the reflection of the spin density wave antiferromagnetic transition and the coexistence of different magnetic phases in the alloy. Our results reflect the fact that internal friction method would be a sensitive and effective probe for investigating the change of microstructure including electric structure. PACC: 6240; 7530F; 7550E

关 键 词：铬铁锰合金 自旋密度波材料 低频内耗 

分 类 号：TG111.7[金属学及工艺—物理冶金]