Hopfion ring (clean) (IMAGE) Forschungszentrum Juelich Caption The illustrationschematically shows the magnetization of the hopfion ring around a skyrmion string. Credit Forschungszentrum Jülich / Nikolai Kiselev Usage Restrictions Please give credit. License Original 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.