[19p-E215-1~17] 4.5 Terahertz Photonics

▲ [19p-E215-8] [INVITED] Ultrafast manipulation of magnetization by terahertz pulses and terahertz devices based on magnetic materials

〇Makoto Nakajima¹ (1.ILE, Osaka Univ.)

キーワード：terahertz, spin, ultrafast control

We demonstrate our recent experimental studies that the ultrafast magnetization control in magnetic materials by terahertz (THz) pulses, and THz emitter and detection based on the magnetic materials. The THz pulses can control the direction of the macroscopic magnetization in the magnetic domain after the spin reorientation phase transition for ErFeO₃. The impulsive response of the magnetization in e-Fe₂O₃ by THz pulse excitation is observed and the fast and decay rate are ~ 400 fs which corresponds to the time duration of the THz pump pulses. The improvement of the terahertz detection in magnetic materials using metamaterial and metallic waveguide was demonstrated. Our results indicate that the usage of terahertz magnetic field has a high potential to control the magnetization and magnetic domain with the sub-picoseconds time resolution, and will open a door way to ultrafast THz spintronics.