This project will establish a novel class of smart biohybrid structures and devices based on magnetic nanoparticles and self-assembled supramolecular structures composed of DNA.The developments made within the project will lay the foundation for novel magneticmetamaterials with numerous potential applications ranging from fundamental physical studies over (bio)sensing to reconfigurable hardware and nanorobotics. On a fundamental level, we will gain more understanding of the local behaviour and interactions of magnetic dipoles by the precise control of their nanoscopic geometry and distances. These fundamental insights will then be used to direct the assembly of magnetic nanoparticles into large-scale ordered lattices and crystals, resulting in "meta-ferromagnetism" or relatedphenomena. Integration of magnetic nanoaparticles into DNA-based molecular devices will result in smart, switchable, magnetic coatings and sensors. On the long run, magnetic biohybrid structures may be utilized as components of nanorobotic and reconfigurable molecular systems.