1, different application fields: gyromagnetic is mainly used in AC motors, measuring instruments and other equipment. By applying an alternating electric field, materials are deformed and sound waves are generated. Terahertz band is widely used in many fields, such as material analysis, communication and imaging, security detection and so on. It can penetrate nonmetallic materials to reveal internal structural information, and has the potential of high-speed data transmission and good resolution.

2. Different physical characteristics: gyromagnetic is a phenomenon that a material deforms or produces sound waves under the action of an external alternating electric field, which involves lattice structure distortion and volume change. Terahertz radiation is electromagnetic radiation in the frequency range between infrared and microwave (0. 1 to 10 terahertz). Its characteristics include penetrating non-metallic substances and providing characteristic spectral analysis of substances, which has broad application prospects in communication, imaging, safety detection and so on.