Ultrafast manipulation of magnetization by terahertz pulses and terahertz devices based on magnetic materials

摘要

The approaches to investigate spin dynamics and properties using the terahertz pulse and terahertztechniques have been studied actively recently [1-15]. Especially, the usage of the magnetic fieldcomponent of the high intensity terahertz (THz) pulses [1,16-18] is recognized as a powerful tool forinvestigating spin dynamics via magnetic dipole interaction. Up to now, we have reported some studiesusing THz magnetic pulse excitation such as ultrafast spin spectroscopy, the circularly polarized THz waveemission, tunable THz absorber and wave plate, and macroscopic magnetic domain control in thenano-magnet -Fe_2O_3 and the weak ferromagnet rare-earth orthoferrites [1-15].