09:30 〜 11:30
▲ [6a-PA3-19] Terahertz Emission Based on Spin Current from Ferromagnetic Heterostructures
キーワード：THz emission, spin current, ferromagnetic heterostructure
Modern spin-based electronics (spintronics) store and process the information via the spin degree of the freedom. The processing of spin dynamics in spintronic devices is frequently relevant to the spin currents. The femtosecond laser pulse provides a novel stimulus for exciting ultrafast spin current transient on subpicosecond timescales in metallic magnetic heterostructures. In this work, we demonstrate the terahertz (THz) emission related with spin current in ferromagnetic heterostructures which contains a ferromagnetic metal layer and a non-magnetic layer. The spin current transient is temporally probed in a contactless way on the basis of inverse spin Hall effect and electric dipole radiation, which give rise to a terahertz emission. The non-magnetic layer thickness dependence of the emission amplitude is studied. This research provides new insights in excitation and detection of spin currents in terahertz regime.