Room‐Temperature Glassy Phenomena in Polycrystalline Mn₃Sn Induced by Uniaxial Stress

Spin glass (SG) typically arises from frustrated magnetoresistance, which confines SG behavior to low temperatures. This characteristic results in notably low glass transition temperatures, posing significant challenges for research and practical applications of SG materials. This article reports the discovery of the SG state at room temperature in noncoplanar polycrystalline Mn 3 Sn, exhibiting an exceptionally high freezing temperature of 430 K, accompanied by significant relaxation phenomena at 300 K and memory effect. These phenomena are attributed to the interplay between in‐plane antiferromagnetic and out‐of‐plane ferromagnetic interactions within its structure. This noncoplanar structure is achieved by applying high uniaxial stress ( σ ) to the noncollinear polycrystalline Mn 3 Sn. This discovery renders it feasible to stabilize the SG state at room temperature through the manipulation of σ and holds great promise for the practical application of SG in spintronics.