Robust perpendicular exchange coupling in an ultrathin CoO/PtFe double layer: Strain and spin orientation

We report on the exchange coupling and magnetic properties of a strained ultrathin CoO/PtFe double layer with perpendicular magnetic anisotropy. The cobalt oxide growth by reactive molecular beam epitaxy on a Pt-terminated PtFe/Pt(001) surface gives rise to a hexagonal surface and a monoclinic disto...

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Veröffentlicht in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-10, Vol.88 (14), Article 140401
Hauptverfasser: Lamirand, Anne D., Soares, Márcio M., Ramos, Aline Y., Tolentino, Hélio C. N., De Santis, Maurizio, Cezar, Julio C., de Siervo, Abner, Jamet, Matthieu
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Sprache:eng
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Zusammenfassung:We report on the exchange coupling and magnetic properties of a strained ultrathin CoO/PtFe double layer with perpendicular magnetic anisotropy. The cobalt oxide growth by reactive molecular beam epitaxy on a Pt-terminated PtFe/Pt(001) surface gives rise to a hexagonal surface and a monoclinic distorted CoO 3 nm film at room temperature. This distorted ultrathin CoO layer couples with the PtFe(001) layer establishing a robust perpendicular exchange bias shift. Soft x-ray absorption spectroscopy provides a full description of the spin orientations in the CoO/PtFe double layer. The exchange bias shift is preserved up to the Neel antiferromagnetic ordering temperature of T sub(N) = 293 K. This unique example of selfsame value for blocking and ordering temperatures, yet identical to the bulk ordering temperature, is likely related to the original strain-induced distortion and strengthened interaction between the two well-ordered spin layers.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.88.140401