Jülich/Garching, 29 July 2020 - Magnetic nanoparticles react differently to an external magnetic field than was previously expected. This has been shown in a study by an international research team which included Forschungszentrum Jülich and its neutron scattering facilities. To the surprise of the researchers, the magnetic core of the particles is seen to grow as a result of the exposure. The scientists’ investigations enable a more precise understanding to be gained of the structure and behaviour of particles in a magnetic field. This is an important step in the realization of sophisticated technical applications using such particles, for example, in achieving higher storage density in the computers of the future, or developing better battery technologies. The medical field is also interested in magnetic nanoparticles: with their help, specific areas of the body can be targeted with heat therapy in order to treat cancer.