Experimental images hopfion rings (IMAGE) Uppsala University Caption The experimental images (snapshots showing over-focused Lorentz transmission electron microscopy image of a hopfion ring in a 180 nm-thick FeGe plate at two different values of the applied magnetic field). Credit: Fengshan Zheng/Forschungszentrum Jülich. Credit Fengshan Zheng/Forschungszentrum Jülich Usage Restrictions Credit must be given to the creator. License CC BY 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.