Morphotropic Phase Boundaries in Ferromagnets: Tb1-xDyxFe2 Alloys
Morphotropic Phase Boundaries in Ferromagnets: Tb1-xDyxFe2 Alloys
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DOI：
10.1103/physrevlett.111.017203
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发表时间：
2013-07-03
影响因子：
8.6
通讯作者：
Laver, Mark
中科院分区：
文献类型：
--
作者：
Bergstrom, Richard, Jr.;Wuttig, Manfred;Laver, Mark
通过准同型相界（MPB）分离不同对称性的铁相，研究了铁磁体Tb_（1-x）Dy_xFe_（2-x）的结构和性质。我们的同步加速器数据支持一级结构转变，在更高的温度下，MPB宽度变宽。磁力机械应用的最佳点不是集中在MPB上，而是位于菱形侧，其中菱形主体相的高收缩与MPB的软化各向异性相结合。我们比较了我们的研究结果与单离子晶体场理论和铁电MPBs，其中控制能量是不同的。
The structure and properties of the ferromagnet Tb1-xDyxFe2 are explored through the morphotropic phase boundary (MPB) separating ferroic phases of differing symmetry. Our synchrotron data support a first order structural transition, with a broadening MPB width at higher temperatures. The optimal point for magnetomechanical applications is not centered on the MPB but lies on the rhombohedral side, where the high striction of the rhombohedral majority phase combines with the softened anisotropy of the MPB. We compare our findings with single ion crystal field theory and with ferroelectric MPBs, where the controlling energies are different.