Dynamical Magnetic Field Accompanying the Motion of Ferroelectric Domain Walls
Dynamical Magnetic Field Accompanying the Motion of Ferroelectric Domain Walls
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DOI：
10.1103/physrevlett.123.127601
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发表时间：
2019-09-17
影响因子：
8.6
通讯作者：
Spaldin, Nicola A.
中科院分区：
文献类型：
--
作者：
Juraschek, Dominik M.;Meier, Quintin N.;Spaldin, Nicola A.
最近提出的动态多铁性效应描述了由时间变化的电极化产生的磁化。在这里，我们证明了这种效应可以在移动的铁电畴壁上产生磁场，其中离子的重排对应于铁电极化在时间上的旋转。利用密度泛函理论和唯象模型相结合的方法，推导出了BaTiO_3中动态磁场的表达式，并计算了BaTiO_3中90度和180度磁畴壁的有关参数，以及极天子的相关参数。我们发现在壁中心的磁场达到数量级，并且我们提出了两个实验用氮空位中心磁测量来测量这种影响。
The recently proposed dynamical multiferroic effect describes the generation of magnetization from temporally varying electric polarization. Here, we show that the effect can lead to a magnetic field at moving ferroelectric domain walls, where the rearrangement of ions corresponds to a rotation of ferroelectric polarization in time. We develop an expression for the dynamical magnetic field, and calculate the relevant parameters for the example of 90 degrees and 180 degrees domain walls, as well as for polar skyrmions, in BaTiO3, using a combination of density functional theory and phenomenological modeling. We find that the magnetic field reaches the order of several mu T at the center of the wall, and we propose two experiments to measure the effect with nitrogen-vacancy center magnetometry.