Department of Physics and Astronomy, Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, NE 68588-0299, USA.
J Phys Condens Matter. 2012 Jun 6;24(22):226003. doi: 10.1088/0953-8984/24/22/226003. Epub 2012 May 2.
Density-functional calculations are employed to investigate the effect of ferroelectric polarization of BaTiO(3) on the magnetocrystalline anisotropy of the Fe /BaTiO(3)(001) interface. It is found that the interface magnetocrystalline anisotropy energy changes from 1.33 to 1.02 erg cm (-2) when the ferroelectric polarization is reversed. This strong magnetoelectric coupling is explained in terms of the changing population of the Fe 3d orbitals at the Fe/BaTiO(3) interface driven by polarization reversal. Our results indicate that the electronically assisted magnetoelectric effects at the ferromagnetic/ferroelectric interfaces may be a viable alternative to the strain mediated coupling in related heterostructures and the electric field-induced effects on the interface magnetic anisotropy in ferromagnet/dielectric structures.
密度泛函计算被用来研究 BaTiO(3) 的铁电极化对 Fe / BaTiO(3)(001) 界面磁晶各向异性的影响。结果发现，当铁电极化反转时，界面磁晶各向异性能从 1.33 变为 1.02 erg cm(-2)。这种强的磁电耦合可以用极化反转驱动的 Fe/BaTiO(3) 界面 Fe 3d 轨道的电子占据数的变化来解释。我们的结果表明，在铁磁/铁电界面处的电子辅助磁电效应可能是相关异质结构中应变介导耦合的一种可行替代方案，以及铁磁/介电结构中界面磁各向异性对电场的感应效应。
