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Fe3O4 possesses unique properties such as high Curie temperature and half-metallic nature and therefore can function as a high-spin-polarized electrode in spintronic devices. In order to use this compound in such devices, the magnetic characteristics of multilayers used in these devices, which include Fe3O4, should be highly controllable. In this study, we fabricated Fe3O4/Pt or Cr (0–10 nm)/Fe systems through epitaxial growth on MgO(110) substrates in order to investigate the magnetic coupling in Fe3O4 and metallic hybrid systems. We found that these two systems show a marked difference in the dependence of the coercive field (Hc) of the Fe layer on the nonmagnetic-metal-layer thickness. Hc for the system with Pt showed variation characteristics of interlayer exchange coupling in metal systems, while Hc increased monotonically with the thickness of the Cr layer.

The magnetic properties of Fe3O4/nonmagnetic metal/Fe hybrid systems