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High antiferromagnetic domain wall velocity induced by Néel spin-orbit torques

机译:Néel自旋轨道转矩引起的高反铁磁畴壁速度

摘要

We demonstrate the possibility to drive an antiferromagnetic domain wall at high velocities by fieldlike Néel spin-orbit torques. Such torques arise from current-induced local fields that alternate their orientation on each sublattice of the antiferromagnet and whose orientation depends primarily on the current direction, giving them their fieldlike character. The domain wall velocities that can be achieved by this mechanism are 2 orders of magnitude greater than the ones in ferromagnets. This arises from the efficiency of the staggered spin-orbit fields to couple to the order parameter and from the exchange-enhanced phenomena inudantiferromagnetic texture dynamics, which leads to a low domain wall effective mass and the absence of a Walker breakdown limit. In addition, because of its nature, the staggered spin-orbit field can lift the degeneracy between two 180° rotated states in a collinear antiferromagnet, and it provides a force that can move such walls and control the switching of the states.
机译:我们证明了通过像场一样的Néel自旋轨道扭矩以高速度驱动反铁磁畴壁的可能性。这种转矩来自电流感应的局部磁场,这些局部磁场在反铁磁体的每个子晶格上交替改变其方向,并且其取向主要取决于电流方向,从而赋予它们类似场的特性。通过这种机制可以实现的畴壁速度比铁磁体中的大2个数量级。这是由于交错的自旋轨道场耦合到阶数参数的效率以及来自反铁磁磁性纹理动力学的交换增强现象而引起的,这导致了低畴壁有效质量并且没有沃克击穿极限。另外,由于其性质,交错的自旋轨道场可以在共线反铁磁体中提升两个180°旋转状态之间的简并性,并且提供可以移动此类壁并控制状态切换的力。

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