Figure 1.

Visualization of the magnetite unit cell identified using octahedral Fe^2.5+ (dark grey), tetrahedral Fe²⁺ (light grey), and oxygen (red). The local site symmetries are shown by the octahedral and tetrahedral shapes around fully coordinated Fe sites within the unit cell. The different bond angles between the Fe sites lead to dominant antiferromagnetic coupling between the tetrahedral and octahedral sites, giving a bulk ferrimagnetic order (adapted from [34] with permission from Springer Nature).