The article by Kimel et al. (2005) demonstrates the use of circularly polarized femtosecond laser pulses to non-thermally excite and coherently control spin dynamics in magnets through the inverse Faraday effect. This method, which is instantaneous and limited by the pulse width (~200 fs), offers a new mechanism for ultrafast coherent spin control. The study focuses on dysprosium orthoferrite (DyFeO3), a material with a strong spin-orbit interaction and a giant Faraday rotation. The researchers observed that the optical control of magnetization is most efficient in materials with high Faraday rotation per unit magnetization. The findings suggest that ultrafast lasers can be used to manipulate magnetic properties, potentially opening new avenues for applications in magnetic devices. The experimental results show that the optically induced magnetization is equivalent to a 200 fs magnetic field pulse up to 5 T, and the effect is feasible below the damage threshold of DyFeO3. This work provides insights into the understanding of ultrafast magnetic excitation and highlights the potential of ultrafast photomagnetic phenomena in various magnetic materials.The article by Kimel et al. (2005) demonstrates the use of circularly polarized femtosecond laser pulses to non-thermally excite and coherently control spin dynamics in magnets through the inverse Faraday effect. This method, which is instantaneous and limited by the pulse width (~200 fs), offers a new mechanism for ultrafast coherent spin control. The study focuses on dysprosium orthoferrite (DyFeO3), a material with a strong spin-orbit interaction and a giant Faraday rotation. The researchers observed that the optical control of magnetization is most efficient in materials with high Faraday rotation per unit magnetization. The findings suggest that ultrafast lasers can be used to manipulate magnetic properties, potentially opening new avenues for applications in magnetic devices. The experimental results show that the optically induced magnetization is equivalent to a 200 fs magnetic field pulse up to 5 T, and the effect is feasible below the damage threshold of DyFeO3. This work provides insights into the understanding of ultrafast magnetic excitation and highlights the potential of ultrafast photomagnetic phenomena in various magnetic materials.