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By first principles calculations, we demonstrate that when decorated withphotochromic molecules, it is possible to use light to reversibly control themagnetic properties of a nanoscale magnetic system. The combination of agraphene-based magnetic system and a photochromic azobenzene molecule is chosenas a model system. The {\it trans} and {\it cis} isomers of the azobenzenemolecule that can be converted between each other by means of photoexcitationsare found to have drastically different effects on the magnetic properties ofthe system. The results may pave the way for the future design of lightcontrollable molecular-scale spintronic devices.

Reversible magnetism switching in graphene-based systems via the decoration of photochromic molecules