School of Materials Science and Engineering, Xiangtan University, Hunan 411105, China.
Department of Physics, College of Science, National University of Defense Technology, Hunan 410073, China.
Phys Chem Chem Phys. 2019 Oct 14;21(38):21381-21388. doi: 10.1039/c9cp04194j. Epub 2019 Sep 18.
In multiferroics, electromagnons have been recognized as a noticeable topic due to their indispensable role in magnetoelectric, magnetodielectric, and magnetocapacitance effects. Here, the electromagnons of BiNdFeO (x = 0-0.2) nanoparticles are studied via terahertz time-domain spectroscopy, and the impacts of doping concentrations on electromagnons have been discussed. We found that the electromagnons in BiNdFeO nanoparticles are associated with their phase transition. The total coupling weight of electromagnons is gradually increased in polar R3c structures and then reduces in the antipolar Pbam phase, and the weight in the antipolar phase is less than that of the pure R3c phase. Interestingly, a colossal electromagnon is observed at polar-antipolar and antiferromagnetic-ferromagnetic phase boundaries. Our work offers an avenue for designing and choosing materials with better magnetodielectric and magnetocapacitance properties.
在多铁性材料中，电磁振子因其在磁电、磁介电和磁电容效应中的不可或缺作用而备受关注。本工作通过太赫兹时域光谱研究了 BiNdFeO（x = 0-0.2）纳米粒子的电磁振子，并讨论了掺杂浓度对电磁振子的影响。我们发现，BiNdFeO 纳米粒子中的电磁振子与其相转变有关。在极性 R3c 结构中，电磁振子的总耦合权重逐渐增加，然后在反铁磁 Pbam 相中降低，反铁磁相中的权重小于纯 R3c 相。有趣的是，在极性-反极性和反铁磁-铁磁相界处观察到了巨大的电磁振子。本工作为设计和选择具有更好磁介电和磁电容性能的材料提供了途径。
