Duan Chun-Gang, Jaswal S S, Tsymbal E Y
Department of Physics and Astronomy, Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588, USA.
Phys Rev Lett. 2006 Jul 28;97(4):047201. doi: 10.1103/PhysRevLett.97.047201. Epub 2006 Jul 25.
An unexplored physical mechanism which produces a magnetoelectric effect in ferroelectric-ferromagnetic multilayers is studied based on first-principles calculations. Its origin is a change in bonding at the ferroelectric-ferromagnet interface that alters the interface magnetization when the electric polarization reverses. Using Fe/BaTiO3 multilayers as a representative model, we show a sizable difference in magnetic moments of Fe and Ti atoms at the two interfaces dissimilar by the orientation of the local electric dipole moments. The predicted magnetoelectric effect opens a new direction to control magnetic properties of thin-film layered structures by electric fields.
基于第一性原理计算，研究了一种在铁电 - 铁磁多层膜中产生磁电效应的未被探索的物理机制。其起源是铁电 - 铁磁界面处键合的变化，当电极化反转时，这种变化会改变界面磁化强度。以Fe/BaTiO₃多层膜作为代表性模型，我们展示了在两个界面处，Fe和Ti原子的磁矩因局部电偶极矩方向不同而存在显著差异。预测的磁电效应为通过电场控制薄膜层状结构的磁性开辟了一个新方向。
