Micromagnetic Model (IMAGE) Forschungszentrum Juelich Caption This micromagnetic model shows the three-dimensional vortex structure of magnetite nanocrystals. Credit University of Edinburgh Usage Restrictions Image may only be used with appropriate credit. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.