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Cobalt ferrite ultrathin films with inverse spinel structure are among thebest candidates for spin-filtering at room temperature. We have fabricatedhigh-quality epitaxial ultrathin CoFe2O4 layers on Ag(001) following athree-step method: an ultrathin metallic CoFe2 alloy was first grown incoherent epitaxy on the substrate, and then treated twice with O2, first at RTand then during annealing. The epitaxial orientation, the surface, interfaceand film structure were resolved combining LEED, STM, Auger and in situ GIXRD.A slight tetragonal distortion was observed, that should drive the easymagnetization axis in plane due to the large magneto-elastic coupling of such amaterial. The so-called inversion parameter, i.e. the Co fraction occupyingoctahedral sites in the ferrite spinel structure, is a key element for itsspin-dependent electronic gap. It was obtained through in-situ x-ray resonantdiffraction measurements collected at both the Co and Fe K edges. The dataanalysis was performed using the FDMNES code and showed that Co ions arepredominantly located at octahedral sites with an inversion parameter of 0.88+- 0.05. Ex-situ XPS gave an estimation in accordance with the values obtainedthrough diffraction analysis.

High quality cobalt ferrite ultrathin films with large inversion parameter grown in epitaxy on Ag(001)