Observation of room-temperature magnetic skyrmions and their current-driven dynamics in ultrathin metallic ferromagnets
Observation of room-temperature magnetic skyrmions and their current-driven dynamics in ultrathin metallic ferromagnets
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DOI：
10.1038/nmat4593
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发表时间：
2016-05-01
期刊：
影响因子：
41.2
通讯作者：
Beach, Geo Rey S. D.
中科院分区：
文献类型：
--
作者：
Woo, Seonghoon;Litzius, Kai;Beach, Geo Rey S. D.
磁性斯格明子 (1,2) 是受拓扑保护的自旋纹理，表现出令人着迷的物理行为 (1-6) 和在高能效自旋电子器件应用中的巨大潜力 (7-13)。迄今为止的主要障碍是仅在少数奇异材料和低温下（1-4,6-8）观察到斯格明子，并且尚未实现单个斯格明子的快速电流驱动运动。在这里，我们报告了利用磁透射软 X 射线显微镜在室温下观察到超薄过渡金属铁磁体中稳定的磁性斯格明子。我们展示了生成稳定的斯格明子晶格并通过短电流脉冲沿磁跑道以超过 100m s(-1) 的速度驱动单个斯格明子的能力，以满足应用的需要。我们的研究结果为最近的预测提供了实验证据 (10-13)，并为稳健薄膜异质结构中的室温斯格明子自旋电子学打开了大门。
Magnetic skyrmions(1,2) are topologically protected spin textures that exhibit fascinating physical behaviours(1-6) and large potential in highly energy-efficient spintronic device applications(7-13). The main obstacles so far are that skyrmions have been observed in only a few exotic materials and at low temperatures(1-4,6-8), and fast current-driven motion of individual skyrmions has not yet been achieved. Here, we report the observation of stable magnetic skyrmions at room temperature in ultrathin transition metal ferromagnets with magnetic transmission soft X-ray microscopy. We demonstrate the ability to generate stable skyrmion lattices and drive trains of individual skyrmions by short current pulses along a magnetic racetrack at speeds exceeding 100m s(-1) as required for applications. Our findings provide experimental evidence of recent predictions(10-13) and open the door to room-temperature skyrmion spintronics in robust thin-film heterostructures.