Abstract
The field of magnetism has gained significant interest during the past few years, due to the tremendous experimental efforts in the realization of the theoretically proposed new class of magnetism, the altermagnetism. Among the candidate materials, the ruthenium dioxide (RuO2), which was considered as the prototypical d-wave altermagnet, has experienced intensive and ongoing debates on whether it is an altermagnet or not. In this talk, I will present our comprehensive understanding of the altermagnetism in RuO2 from the transport point of view [1, 2]. In addition, I will also briefly introduce several related results from our recent works, including the efficient heat to spin conversion in a 3d alloy [3], the magnon spin current generation from a non-collinear ferrimagnet [4], and the interfacial spin-orbit coupling at the ferromagnet/nonmagnet interface [5]. Together, these studies advance our understanding of spin-dependent transport across different magnetic states and provide a foundation for designing future spintronic devices.