GIANT MAGNETOSTRICTION MATERIALS
GIANT MAGNETOSTRICTION MATERIALS
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DOI：
10.1016/0304-8853(91)90819-v
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发表时间：
1991-11-01
影响因子：
2.7
通讯作者：
DAS, BN
中科院分区：
文献类型：
--
作者：
KOON, NC;WILLIAMS, CM;DAS, BN
20世纪70年代初S在磁学方面的重大技术进展之一是发现了一类新的稀土金属间化合物RFe2Laves相，它的室温磁致伸缩应变接近2×10(-3)，比以往任何已知的磁致伸缩应变都大一个数量级。从那时起，这些材料的基本性质和技术性质一直引起人们的浓厚兴趣，直到今天，它们仍然是活跃研究的主题。现有的大应变可用于在水中产生高振幅、低频率的声波、某些类型的应变计、振动补偿和大型激光反射镜中的温度感应应变补偿。由于这些材料的性能关键取决于材料的磁各向异性、磁化强度和颗粒取向等基本性质，所以基础研究和应用之间存在着很强的相互作用。在本文中，我们简要回顾了RFe2 Laves相的基本磁性和磁致伸缩性质，重点讨论了各向异性的复杂行为和晶场理论对其解释的成功。我们还提供了磁激发谱的中子测量，并解释了它们如何为这些系统提供对平均场理论显着成功的理解。
One of the significant technical developments in magnetism of the early 1970's was the discovery of a new class of rare earth intermetallic compounds, the RFe2 Laves phases, which were found to exhibit room temperature magnetostrictive strains approaching 2 x 10(-3), an order of magnitude larger than any previously known. Since that time both the fundamental and technical properties of these materials have been of intense interest, and they remain the subject of active research even today. The large strains available are useful in such applications as production of high amplitude, low frequency sound waves in water, certain types of strain gages, vibration compensation and compensation for temperature induced strains in large laser mirrors. Because the performance of these materials depends critically on such fundamental properties as the magnetic anisotropy, magnetization and grain orientation of the material, there has been a very strong interplay between fundamental studies and applications. In this article we briefly review the fundamental magnetic and magnetostrictive properties of the RFe2 Laves phases, focusing especially on the complex behavior of the anisotropy and the success of crystal field theory in explaining it. We also present neutron measurements of magnetic excitation spectra and explain how they provide an understanding of the remarkable success of mean field theory for these systems.