论文标题
拓扑半学EUB6的磁性域结构和域壁结合状态
Magnetic domain structure and domain wall bound states of topological semimetal EuB6
论文作者
论文摘要
电动操纵结构域壁（DW）位于旋转型领域的中心。通过利用拓扑DW绑定状态，磁性Weyl Semimetal（WSM）提供了用于对DW的电动操作的额外旋钮。使用磁WSM材料EUB6作为原型系统，我们通过磁力显微镜（MFM）研究了其DW结合状态，结合了第一原理计算和域成像。 MFM测量结果表明，具有磁化强度的域沿三个[100]方向对齐的域沿着[001]方向的小磁场在其他方向上占主导地位。因此，基于实验确定的DW类型执行第一原理计算，该类型显示出强大的DW绑定状态，该状态在DW Brillouin区域的很大一部分上具有光谱分布。此类DW结合状态应导致大量的局部电荷，这些电荷可用于通过施加在局部DW电荷上的静电力来驱动DW运动。
Electrically manipulating domain wall (DW) is at central in the field of spintronics. Magnetic Weyl semimetal (WSM) offers an additional knob for electric manipulation of DW by utilizing the topological DW bound states. Using magnetic WSM material EuB6 as a prototype system, we investigate its DW bound states combining first principles calculations and domain imaging via magnetic force microscopy (MFM). The MFM measurements reveal that domains with magnetization aligned along three [100] directions dominate over others under a small magnetic field along [001] direction. Accordingly, first principles calculations are performed based on experimentally determined DW type, which show a robust DW bound state featuring a spectral distribution over a large portion of the DW Brillouin zone. Such DW bound states should result in significant amount of localized charges which can be used to drive DW motion via the electrostatic forces exerted on the localized DW charges.
