Room-Temperature Creation and Spin Orbit Torque Manipulation of Skyrmions in Thin Films with Engineered Asymmetry
Room-Temperature Creation and Spin Orbit Torque Manipulation of Skyrmions in Thin Films with Engineered Asymmetry
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DOI：
10.1021/acs.nanolett.5b05257
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发表时间：
2016-03-01
期刊：
影响因子：
10.8
通讯作者：
Wang, Kang L.
中科院分区：
文献类型：
--
作者：
Yu, Guoqiang;Upadhyaya, Pramey;Wang, Kang L.
磁性Skyrmions是一种受拓扑保护的自旋织构，是超低能和超高密度磁数据存储和计算应用的潜在候选者。到目前为止，大多数关于Skyrmions的实验都是在低温下进行的。可用材料的选择有限，而且缺乏控制设备中的Skyrmions的电气手段。在这项工作中，我们展示了一种新的方法，通过设计铁磁层的界面垂直磁各向异性，在室温下在CoFeB-MgO材料系统中产生稳定的Skyrmion泡沫相。重要的是，我们还证明了人工设计的对称破缺除了电流诱导的自旋轨道扭矩外，还会产生一个作用力作用于Skyrmions，这可以用来驱动Skyrmions的运动。这种在室温下创造和操纵Skyrmions为设计Skyrmions设备提供了新的可能性。这些结果使Skyrmionic存储器和逻辑概念更接近于在工业相关和可制造的薄膜材料系统中实现。
Magnetic skyrmions, which are topologically protected spin textures, are promising candidates for ultralow-energy and ultrahigh-density magnetic data storage and computing applications. To date, most experiments on skyrmions have been carried out at low temperatures. The choice of available materials is limited, and there is a lack of electrical means to control skyrmions in devices. In this Work, we demonstrate a new method for creating a stable skyrmion bubble phase in the CoFeB-MgO material system at room temperature, by engineering the interfacial perpendicular magnetic anisotropy of the ferromagnetic layer. Importantly, we also demonstrate that artificially engineered symmetry breaking gives rise to a force acting on the skyrmions, in addition to the current-induced spin orbit torque, which can be used to drive their motion. This room-temperature creation and manipulation of skyrmions offers new possibilities to engineer skyrmionic devices. The results bring skyrmionic memory and logic concepts closer to realization in industrially relevant and manufacturable thin film material systems.