Magnetic Structure of Manganese Oxide (IMAGE) DOE/Brookhaven National Laboratory Caption This is the magnetic structure of manganese oxide (MnO), with Mn ions as purple spheres and O ions as red spheres. The dashed purple line labeled J1 shows a direct-exchange interaction between nearest-neighbor Mn ions; J2 shows a superexchange interaction between second-nearest neighbor Mn ions through an intermediary O ion. Credit The Billinge Group Usage Restrictions None 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.