Magnetic domain-walls (DWs) with a preferred chirality exhibit very efficient current-driven motion. Since structural inversion asymmetry (SIA) is required for their stability, the observation of chiral domain walls in highly symmetric Pt/Co/Pt is intriguing. Here, we tune the layer asymmetry in this system and observe, by current-assisted DW depinning experiments, a small chiral field which sensitively changes. Moreover, we convincingly link the observed efficiency of DW motion to the DW texture, using DW resistance as a direct probe for the internal orientation of the DW under the influence of in-plane fields. The very delicate effect of capping layer thickness on the chiral field allows for its accurate control, which is important in designing novel materials for optimal spin-orbit-torque-driven DW motion.
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机译：具有优选手性的磁畴壁（DW）表现出非常有效的电流驱动运动。由于结构反转不对称性（SIA）是其稳定性所必需的，因此在高度对称的Pt / Co / Pt中手性畴壁的观察很有趣。在这里，我们调整了该系统中的层不对称性，并通过电流辅助DW脱钉实验观察了一个灵敏变化的小手征场。此外，我们令人信服地将观察到的DW运动效率与DW纹理联系起来，使用DW电阻作为直接探查DW在面内场的内部定向的内部方向的方法。覆盖层厚度对手性场的非常微妙的影响使其可以精确控制，这对于设计新型材料以实现最佳自旋轨道转矩驱动的DW运动非常重要。
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