Credit: IKBFU To achieve target delivery of drugs to cells and organs, scientists have to be able to transport the molecules of pharmaceutical substances to targets using a controllable carrier. The role of such a carrier can be played by special particles, such as lipid droplets or magnetic nanoparticles. Among the latter, the most popular are the ones based on iron oxides. Their sizes range from 1 to 100 nm, which is dozens of times smaller than animal cells, and they can be moved within a body using an external magnetic field. However, in practice, it is quite difficult to control nanoparticles with magnets, as the magnetic field quickly becomes weaker when the distance from the magnet increases. This problem is usually solved by superconducting magnets with very high magnetic field intensity. However, they are extremely expensive and difficult to work with. A team of scientists from Immanuel Kant Baltic Federal University (Kaliningrad) and the University of Genoa (Italy) suggested a new approach to regular permanent magnets.