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Tb1－x Dyx Co2， Tb1－x Gdx Co2和Tb1－xGdxFe2，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： Tb1－xDyxCo2表现出大磁致伸缩、大磁导率， Tb1－xGdxCo2表现出弱磁致伸缩、大磁导率，而Tb1－xGdxFe2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 re?ported 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.
参考文献
| [1] | Kainuma R;Imano Y;Ito W;Sutou Y;Morito H;Okamoto S;Kitakami O;Oikawa K;Fujita A;Kanomata T;Ishida K.Magnetic-field-induced shape recovery by reverse phase transformation.[J].Nature,20067079(7079):957-960. |
| [2] | JOURNAL OF APPLIED PHYSICS[J].Journal of Applied Physics,200811(11):f2,f2-0. |
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