My research primarily focuses on the spin-orbit torque (SOT) effect, particularly utilizing the spin-orbit coupling of rare-earth metals to modulate SOT efficiency. Additionally, I explore symmetry-breaking designs based on the composition-dependent magnetic properties of rare-earth transition metal systems to investigate the possibility of field-free switching. Recently, I have extended my SOT-based research to Terahertz emission in spintronics, with an emphasis on utilizing the strong spin-orbit coupling of rare-earth metals to control the inter-conversion among charge, spin, and orbital degrees of freedom.