论文标题
偶极簇中的磁电效应
Magnetoelectric effect in dipolar clusters
论文作者
论文摘要
我们将磁相互作用的各向异性和有限固体的点对称性结合在一起，在偶性簇的研究中，作为多效化材料超材料的新基本单元。磁性偶极子的哈密顿量在多边形和多面体的顶点上易于轴，将与对称和反对称交换耦合齐全地映射到哈密顿量。最后一个产生了负责系统及其对称基团的磁模式的dzyaloshinskii-moriya，这与晶体场中具有自旋轨道相互作用的粒子的磁性组相吻合。我们发现该簇带有自旋电流，并且表现出磁电效应。我们希望我们的结果为室温下磁电设备的合理设计铺平了道路。
We combine the anisotropy of magnetic interactions and the point symmetry of finite solids in the study of dipolar clusters as new basic units for multiferroics metamaterials. The hamiltonian of magnetic dipoles with an easy axis at the vertices of polygons and polyhedra, maps exactly into a hamiltonian with symmetric and antisymmetric exchange couplings. The last one gives rise to a Dzyaloshinskii-Moriya contribution responsible for the magnetic modes of the systems and their symmetry groups, which coincide with those of a particle in a crystal field with spin-orbit interaction. We find that the clusters carry spin current and that they manifest the magnetoelectric effect. We expect our results to pave the way for the rational design of magnetoelectric devices at room temperature.
