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The non-collinear antiferromagnetic (AFM) structure makes Mn3Sn exhibitexotic properties. At present, it has been found that both the hydrostaticpressure and the strain introduced by interstitial N atoms have a greatinfluence on this magnetic structure. Here, the effect of the residual strain(RS) on it is investigated. AC and DC magnetic measurement results suggest thatMn3Sn without RS has the non-collinear AFM structure only in the temperaturerange of 285 K to 400 K; while Mn3Sn with RS has a non-coplanar AFM structurein the entire temperature range from 5 K to 400 K. Both anomalous Hall effectand topological Hall effect appears in Mn3Sn with RS, supporting theanticipated non-coplanar AFM structure. Our findings point out a method torealize the chiral non-coplanar AFM structure through the engineering, therebyproviding a path for the construction of topological antiferromagnets.

Effect of residual strain on non-collinear antiferromagnetic structure in Weyl semimetal Mn3Sn