Fig. 1. Research framework and diagram of ultrafast spin-based terahertz photonics

Fig. 2. Terahertz spin wave excitation and spin reorientation transition of RFeO₃^{［49，54］}

Fig. 3. Schematic illustrations of magnon-polariton，magnon-spin coupling，and magnon-magnon coupling

Fig. 4. Principle verification experiment of THz GMR^［67］

Fig. 5. Principle verification experiments of THz TMR and AMR ^［68］

Fig. 6. Schematic diagram of THz emission spectroscopy and ultrafast demagnetization dynamics ^［72］

Fig. 7. The spin currents and THz emission signals of magnetic insulator/Pt and Fe/Pt ^［74］

Fig. 8. THz generation based on spin-to-charge current conversion ^［83］

Fig. 9. THz radiations from W/CoFeB/Pt and Ta/CoFeB/Pt heterostructures ^［91］

Fig. 10. THz emission signals from patterned spintronic THz emitters^{［112-113］}

Fig. 11. Principle of spintronic THz detector based on THz spin-pumping and THz pump magneto-optical Kerr probe