Observation of topological Hall torque exerted on a domain wall in the ferromagnetic oxide SrRuO<sub>3</sub>.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 35427155.
- Also identified by DOI 10.1126/sciadv.abl6192 and PMC identifier 9012465.
- Licence recorded as CC BY-NC.
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Abstract
In a ferromagnetic Weyl metal SrRuO<sub>3</sub>, a large effective magnetic field <i>H</i><sub>eff</sub> exerted on a magnetic domain wall (DW) by current has been reported. We show that the ratio of <i>H</i><sub>eff</sub> 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 <i>H</i><sub>eff</sub> 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.