γ-Fe2O3@Poly(sucrose allyl ether) magnetic microspheres for tumor enhanced magnetic resonance imaging and high-efficiency cooperative magnetothermal therapy

•Visualization and targeting can be achieved.•Photopolymerization can prepare magnetic polymer materials at room temperature, avoiding the phenomenon of high temperature demagnetization caused by thermal polymerization.•Inert allylic monomer materials are activated by light, which is expected to be widely used in the field of biomedical materials.•Sucrose Allyl Ether monomers have polyhydroxy functional groups and enhanced polarity, which can disperse nano-magnetic inorganic substances.