Elmore Family School of Electrical and Computer Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.
Phys Rev Lett. 2023 Jan 20;130(3):036701. doi: 10.1103/PhysRevLett.130.036701.
We study, theoretically, domain wall (DW) magnons-elementary collective excitations of magnetic DWs-in easy-axis layered van der Waals (vdW) antiferromagnets, where they behave as normal modes of coupled spin superfluids. We uncover that, due to spin-charge coupling in vdW magnets, such DW magnons can be activated by voltage-induced torques, thereby providing a path for their low-dissipation and nanoscale excitation. Moreover, the electrical activation and the number of DW magnons at a frequency can be controlled by applying symmetry-breaking static magnetic field, adding tunability of signal transmission by them. Our results highlight that domain walls in vdW magnets provide a promising platform to route coherent spin information for a broad range of explorations in spintronics and magnetism.
我们从理论上研究了易轴层状范德瓦尔斯（vdW）反铁磁体中的畴壁（DW）磁子——磁 DW 的基本集体激发——它们表现为耦合自旋超流体的正常模式。我们揭示了，由于 vdW 磁体中的自旋-电荷耦合，这种 DW 磁子可以通过电压诱导的扭矩来激活，从而为它们的低损耗和纳米级激发提供了一种途径。此外，通过施加对称破缺的静磁场，可以控制在一个频率下 DW 磁子的电激活和数量，从而增加了它们的信号传输可调性。我们的研究结果表明，vdW 磁体中的畴壁为路由相干自旋信息提供了一个很有前途的平台，为自旋电子学和磁性的广泛探索提供了可能。
