@article{oai:nitech.repo.nii.ac.jp:00005571,
 author = {Kida, T and Honda, S and Itoh, H and Inoue, J and Yanagihara, H and Kita, E and Mibu, Ko},
 issue = {10},
 journal = {Physical Review B},
 month = {Sep},
 note = {The exchange coupling (EC) observed recently in Fe/Fe3O4(001) junctions is comparable in magnitude to that in Co/Ru/Co trilayers and has potential applications in spintronic devices. To clarify the EC mechanism, the electronic and magnetic states of Fe/Fe3O4 junctions are calculated via a first-principles method by assuming four structures of bcc Fe layers stacked on Fe3O4 (001) layers. We show that the local magnetic moment m of bcc Fe atoms increases at the interface, whereas that of Fe ions at the Fe3O4 layer decreases at the inferface. The total energy of the junctions is plotted as a function of the distance between Fe and Fe3O4 layers. The EC energy between the Fe and Fe3O4 layers with flat interfaces is calculated to be two orders of magnitude larger than the experimentally determined EC energy. The large energy is attributed to the interatomic exchange interactions at the interface. To explain the experimental results, we propose a mechanism of EC mediated by the impurity-like states of bcc Fe atoms that possess reversed m at the interface. Frustration effects in the EC between Fe and Fe3O4 layers are also discussed., application/pdf},
 pages = {104407-1--104407-10},
 title = {Electronic and magnetic structure at the Fe/Fe 3 O 4 interface},
 volume = {84},
 year = {2011}
}