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