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The structure and strain of ultrathin CoO films grown on a Pt(001) substrateand on a ferromagnetic PtFe pseudomorphic layer on Pt(001) have been determinedwith insitu and real time surface x-ray diffraction. The films grow epitaxiallyon both surfaces with an in-plane hexagonal pattern that yields a pseudo-cubicCoO(111) surface. A refined x-ray diffraction analysis reveals a slightmonoclinic distortion at RT induced by the anisotropic stress at the interface.The tetragonal contribution to the distortion results in a ratio c/a > 1,opposite to that found in the low temperature bulk CoO phase. This distortionleads to a stable Co2+ spin configuration within the plane of the film.

Strain driven monoclinic distortion of ultrathin CoO films in CoO/Pt(001) and exchange-coupled CoO/PtFe/Pt(001) systems