biostudies-literatureWang WIntramural NIST DOC819-824https://www.ebi.ac.uk/biostudies/studies/S-EPMC11566720biostudies-literatureUnknown14(9)The spin Hall effect couples charge and spin transport^1-3, enabling electrical control of magnetization^4,5. A quintessential example of spin-Hall-related transport is the anomalous Hall effect (AHE)⁶, 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 spiNature nanotechnologyAnomalous spin-orbit torques in magnetic single-layer films.PMC115667209999-NISTOhldag HZink BLFan XAmin VPRadhakrishnan ADavidson ALorenz VOAllen SRSilva TJXiao JQWang TCahill DGBalzar DHaney PMWang WWang YfalseAnomalous spin-orbit torques in magnetic single-layer films.The spin Hall effect couples charge and spin transport^1-3, enabling electrical control of magnetization^4,5. A quintessential example of spin-Hall-related transport is the anomalous Hall effect (AHE)⁶, 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 spi2019-01-01T00:00:00Z2019 Sep2025-04-21T22:18:07.198Z2025-04-05T18:41:00.275ZS-EPMC115667203133234610.1038/s41565-019-0504-0