講演情報
[10p-PB3-39]Post-Fabrication Engineering of Laser-Defined Multi-Lane Magnetic Channels in a Single Ferrimagnetic Nanowire
〇(PC)Mojtaba Mohammadi1, Satoshi Sumi1, Kenji Tanabe1, Hiroyuki Awano1 (1.Toyota Technological Institute, Nagoya, Japan)
キーワード：
Racetrack memory、Laser-defined multi-lane architecture、Domain wall motion
Current-driven domain wall (DW) devices, including racetrack memories and spintronic logic architectures, require precise control of DW trajectories to ensure reliable operation at high speed. Conventionally, multiple DW propagation channels are defined through lithographic patterning, increasing fabrication complexity and limiting post-fabrication reconfigurability. Here, we demonstrate an all-optical approach for generating multiple DW transport channels within a single ferrimagnetic nanowire through localized laser annealing (LA). Building on our previous work showing that edge-selective LA stabilizes ultrafast DW motion in Pt/GdFe-based nanowires, we extend the concept by sequentially scanning a focused laser beam across the wire width to create multiple parallel laser-defined tracks. The position, spacing, and number of these tracks can be programmed without any additional lithographic processing. The locally modified regions act as engineered magnetic pathways that spatially guide DW propagation, enabling the formation of multiple independent transport lanes within a continuous magnetic wire. In principle, the creation of N laser-defined tracks can partition a wide wire into N + 1 DW propagation channels, providing a scalable route toward high-density multi-lane racetrack memory architectures. These results establish localized laser process as a versatile post-fabrication tool for engineering reconfigurable magnetic landscapes and controlling DW transport in spintronic devices.