铁磁准同型相界与Laves相稀土合金磁致伸缩效应  

Ferromagnetic Morphotropic Phase Boundary and Magnetostrictive Effect of Laves Phase Rare-Earth Alloys

作　　者：杨森[1] 周超[1] 任晓兵[2] 宋晓平[1] 

机构地区：[1]西安交通大学理学院物质非平衡合成与调控教育部重点实验室,陕西西安710049 [2]西安交通大学前沿科学技术研究院,陕西西安710049

出　　处：《中国材料进展》2016年第6期434-441,共8页Materials China

基　　金：国家自然科学基金资助项目(51371134;51471125;51431007);国家重点基础研究发展计划("973"计划)资助项目(2012CB619401)

摘　　要：磁致伸缩材料是制造换能器和传感器的重要磁性功能材料。此前,在铁电材料中,通过将材料成分控制在准同型相界,获得了大压电效应。因此根据铁磁与铁电材料表现出的物理效应的相似性,可以期待在铁磁材料中构建准同型相界,获得磁场导致的奇异应变特性。本文归纳了已发现的基于准同型相界而构建的Laves相稀土合金体系Tb_(1-x)Dy_xCo_2,Tb_(1-x)Gd_xCo_2和Tb_(1-x)Gd_xFe_2,总结了其磁致伸缩效应和其他物理性能与准同型相界的关系,3个体系在MPB处表现出3种不同的磁致伸缩效应:Tb_(1-x)Dy_xCo_2表现出大磁致伸缩、大磁导率,Tb_(1-x)Gd_xCo_2表现出弱磁致伸缩、大磁导率,而Tb_(1-x)Gd_xFe_2在MPB并没有发现特殊的效应。在铁电材料中,在MPB处各类场致应变效应都得到显著增强,因此铁磁材料与铁电材料的准同型相界效应还有显著不同,还需要更加深入的研究来揭示其作用机理。Magnetostrictive materials are important magnetic functional materials that are widely used in transducers and sensors. Previously, large piezoelectricity was obtained via controlling the composition of ferroelectric materials around morphotropic phase boundary （MPB）. Based on the physical parallelism between ferroelectrics and ferromagnetism, it is expected of anomalous field-induced strain effect for magentic materials at MPB. In this article, three types of recently reported ferromagnetic MPB systems are reviewed, and the relationships between various properties and MPB are summa- rized, not all three types of ferromagnetic MPB systems show large magnetostriction under magnetic field, like ferroelectric MPB systems process large piezoelectricity. The different structures and mechanisms of ferromagnetic MPB systems need to be further studied.

关 键 词：铁磁 准同型相界 磁致伸缩效应 相变 

分 类 号：TG132.27[一般工业技术—材料科学与工程]