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Report No.

Observation of topological Hall torque exerted on a domain wall in the ferromagnetic oxide SrRuO$$_3$$

Yamanouchi, Michihiko*; Araki, Yasufumi   ; Sakai, Takaki*; Uemura, Tetsuya*; Ota, Hiromichi*; Ieda, Junichi   

In a ferromagnetic Weyl metal SrRuO$$_3$$, a large effective magnetic field $$H_mathrm{eff}$$ exerted on a magnetic domain wall (DW) by current has been reported. We show that the ratio of $$H_mathrm{eff}$$ to current density exhibits nonmonotonic temperature dependence and surpasses those of conventional spin-transfer torques and spin-orbit torques. This enhancement is described well by topological Hall torque (THT), which is exerted on a DW by Weyl electrons emerging around Weyl points when an electric field is applied across the DW. The ratio of the $$H_mathrm{eff}$$ arising from the THT to current density is over one order of magnitude higher than that originating from spin-transfer torques and spin-orbit torques reported in metallic systems, showing that the THT may provide a better way for energy-efficient manipulation of magnetization in spintronics devices.



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Category:Multidisciplinary Sciences



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