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arXiv · 1410.6833

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

Anne D. Lamirand·Maurizio De Santis·Marcio M. Soares·Aline Y. Ramos·Stephane Grenier·Helio C. N. Tolentino
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Abstract

The structure and strain of ultrathin CoO films grown on a Pt(001) substrate and on a ferromagnetic PtFe pseudomorphic layer on Pt(001) have been determined with insitu and real time surface x-ray diffraction. The films grow epitaxially on both surfaces with an in-plane hexagonal pattern that yields a pseudo-cubic CoO(111) surface. A refined x-ray diffraction analysis reveals a slight monoclinic 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 distortion leads to a stable Co2+ spin configuration within the plane of the film.

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Anne D. Lamirand, Maurizio De Santis, Marcio M. Soares, Aline Y. Ramos, Stephane Grenier, Helio C. N. Tolentino. 2014-10-24. Strain driven monoclinic distortion of ultrathin CoO films in CoO/Pt(001) and exchange-coupled CoO/PtFe/Pt(001) systems. https://doi.org/10.1088/0953-8984/27/8/085001

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