|
Anomalous spin-orbit torques in magnetic single-layer films
点击次数：
论文类型：期刊论文
论文编号：4156501905040
发表刊物：Nature Nanotechnology
收录刊物：SCI
学科门类：物理学
文献类型：J
卷号：14
期号：9
页面范围：819-824
ISSN号：1748-3387
关键字：Spintronics, Spin-orbit torque, Spin Hall effect, Magneto-optic Kerr Effect
DOI码：10.1038/s41565-019-0504-0
发表时间：2019-07-22
影响因子：38.2
摘要：The spin Hall effect couples charge and spin transport, enabling electrical control of magnetization. A quintessential example of spin-Hall-related transport is the anomalous Hall effect (AHE), first observed in 1880, in which an electric current perpendicular to the magnetization in a magnetic film generates charge accumulation on the surfaces. Here, we report the observation of a counterpart of the AHE that we term the anomalous spin–orbit torque (ASOT), wherein an electric current parallel to the magnetization generates opposite spin–orbit torques on the surfaces of the magnetic film. We interpret the ASOT as being due to a spin-Hall-like current generated with an efficiency of 0.053 ± 0.003 in Ni80Fe20, comparable to the spin Hall angle of Pt7. Similar effects are also observed in other common ferromagnetic metals, including Co, Ni and Fe. First-principles calculations corroborate the order of magnitude of the measured values. This work suggests that a strong spin current with spin polarization transverse to the magnetization can be generated within a ferromagnet, despite spin dephasing. The large magnitude of the ASOT should be taken into consideration when investigating spin–orbit torques in ferromagnetic/non-magnetic bilayers.