In this model, the carriers localized around defects couples strongly with the doped magnetic ions forming a BMP in the inner sphere and can only itinerate with no spin coherence in the outer shell.

• 在理论中，当载子被局域在特定的缺陷时，它与样品中所掺杂的磁性离子产生交互作用而形成束缚磁性极子于内层同心半径里，而其中不具有相同自旋方向的载子也可同时巡游于外层的同心半径中；