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Article Dans Une Revue Journal of Magnetism and Magnetic Materials Année : 2017

Growth and properties of CoO/Fe perpendicular exchange coupled ultra-thin films

Résumé

We investigated the molecular beam epitaxy growth, the structure and the magnetic properties of the exchange coupled CoO/Fe bilayers on Ag(0 0 1). In situ X-ray scattering shows that Fe grows in registry with Ag(0 0 1) with an out-of-plane lattice parameter that varies with the Fe layer total thickness. The growth of CoO to build an exchange coupled CoO/Fe system impacts the Fe layer even at room temperature. Two different bilayers grown under close conditions are studied. They differ by the ratio of the oxidized Fe layers over the 7 initial Fe monolayers (30% and 40% respectively). Low temperature exchange magnetic coupling with a blocking temperature T B of about 180 K–150 K and similar thermal behavior are observed for the two samples. We studied one sample with synchrotron X-ray resonant magnetic scattering confirming that the magnetization was perpendicular to the surface below T B. Noteworthy, we found that the magnetic easy axis was lying in-plane at room temperature, above T B. These results point to another example of perpendicular ferromagnetism in an ultra-thin film due to an exchange mechanism with an antiferromagnetic layer that rotates the magnetic easy axis from in-plane to perpendicular below T B .
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Dates et versions

hal-01575635 , version 1 (21-08-2017)

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Anne Lamirand, Stéphane Grenier, Aline Y. Y. Ramos, Maurizio de Santis, Aude Bailly, et al.. Growth and properties of CoO/Fe perpendicular exchange coupled ultra-thin films. Journal of Magnetism and Magnetic Materials, 2017, 443, pp.195 - 201. ⟨10.1016/j.jmmm.2017.07.079⟩. ⟨hal-01575635⟩
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