Architectures based on a magnetic domain wall (DW) can store and process information at a high speed in a nonvolatile manner with ultra-low power consumption. Recently, transition-metal rare earth metal alloy-based ferrimagnets have attracted a considerable amount of attention for the ultrafast current-driven DW motion. However, the high-speed DW motion is subject to film inhomogeneity and device edge defects, causing challenges in controlling the DW motion and hindering practical application. In this work, we demonstrate a strategy for precisely engineering the DW energy landscape by locally modifying the compensation state in a ferrimagnet via ion irradiation by using the focused ion beam technique. A diode-like DW motion behavior is observed at the lateral junction interface, i.e., the boundary between irradiated and non-irradiated CoGd, enabling selective control over DW pinning and depinning at specific locations. Our work provides insight into the development of next-generation DW-based ferrimagnetic racetrack memory and logic devices.

中文翻译：

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铁磁体中的磁畴壁能量景观工程


基于磁畴壁 （DW） 的架构可以以非易失性方式高速存储和处理信息，并具有超低功耗。近年来，过渡金属稀土金属合金基铁磁体因其超快电流驱动的 DW 运动而受到广泛关注。然而，高速 DW 运动受到薄膜不均匀性和器件边缘缺陷的影响，给控制 DW 运动带来挑战，阻碍了实际应用。在这项工作中，我们展示了一种通过使用聚焦离子束技术通过离子照射局部改变亚铁磁体中的补偿态来精确设计 DW 能量景观的策略。在横向结界面处观察到类似二极管的 DW 运动行为，即受辐照和未受辐照 CoGd 之间的边界，从而能够选择性地控制特定位置的 DW 固定和去固定。我们的工作为下一代基于 DW 的铁磁 racetrack 存储器和逻辑器件的开发提供了见解。