Yuta YAMANE: Current-driven dynamics of noncollinear antiferromagnetic textures

Abstract:
Since the prediction of staggered magnetic order and its experimental observations through 1930- 50s, antiferromagnets (AFMs) have occupied a central place in the study of fundamental magnetism. The absence of macroscopic magnetization in AFMs, however, makes it difficult to effectively manipulate them by use of external magnetic field, a main reason of the limited uses of AFMs in technological applications. In this talk, I will discuss the dynamics of noncollinear- type AFMs driven by spin current injection. Our theoretical model is applicable to technologically important materials such as Mn3Ir and Mn3Sn, enabling an analytical approach to, e.g., domain wall dynamics in those materials. I will also introduce our recent experimental work where we observed continuous rotational motion of the noncollinear spin structure in Mn3Sn induced by dc spin injection.