We propose a metamaterial-based scheme for light-induced static magnetic field generation by rectifying the dynamic magnetic field. The dynamic magnetoelectric coupling localized in the metamaterials drives the electrons to drift unidirectionally, generating static magnetic fields. Explicit theoretical models and numerical simulations demonstrate that the established static magnetic field is in subtesla field strength at deep-subwavelength scale with ultrafast response, and its properties can be artificially designed and manipulated by tuning the structure of metamaterials or the pumping light. Such strategy offers a superior platform for studying and controlling magnetizations and spin effects with a high degree of precision and freedom.

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• Faraday effect
• Light-induced magnetic effects
• Light-matter interaction
• Magnetism
• Metamaterials
• Spin optoelectronics
• Classical electromagnetism
• Finite-element method