In a perpendicularly magnetized (PM) material with the interfacial Dzyaloshinskii–Moriya interaction (iDMI), a chirality-induced effective magnetic field (EMF) acts on a magnetic domain wall, which is a naturally formed in-plane magnetized (IM) region sandwiched by perpendicular (PM) regions. In this study, we artificially created a Pt/Co/MgO system with the regions exhibiting different anisotropy, that is, IM and PM regions, and the chirality-induced EMF at the PM/IM boundary was investigated using it. The EMF in the IM region was probed using magnetoresistance (MR) measurements. When the field was applied orthogonally to the wire, a unidirectional shift of the MR curve was observed, indicating that the EMF exists in the IM region. The dependence of the EMF on the width of the IM region suggests that the EMF acts dominantly on the magnetization near the PM/IM boundary. Moreover, the sign of the shift is reversed with reversing the PM direction. The sign and magnitude of the EMF observed in this study suggest that the EMF in the present system is caused by iDMI.

中文翻译：

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具有空间各向异性调制的 Pt/Co/MgO 系统中手性诱导的有效场

在具有界面 Dzyaloshinskii-Moriya 相互作用 (iDMI) 的垂直磁化 (PM) 材料中，手性感应有效磁场 (EMF) 作用在磁畴壁上，磁畴壁是夹在中间的自然形成的面内磁化 (IM) 区域通过垂直 (PM) 区域。在这项研究中，我们人工创建了一个 Pt/Co/MgO 系统，其区域表现出不同的各向异性，即 IM 和 PM 区域，并使用它研究了 PM/IM 边界处手性诱导的 EMF。使用磁阻 (MR) 测量探测 IM 区域中的 EMF。当磁场垂直施加到导线上时，观察到 MR 曲线的单向偏移，表明 IMF 区域存在 EMF。EMF 对 IM 区域宽度的依赖性表明 EMF 主要作用于 PM/IM 边界附近的磁化。此外，随着PM方向的反转，偏移的符号也反转。本研究中观察到的 EMF 的符号和幅度表明，当前系统中的 EMF 是由 iDMI 引起的。