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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2013

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

Résumé

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 N'eel antiferromagnetic ordering temperature of TN = 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.
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Dates et versions

hal-00869637 , version 1 (03-10-2013)

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Anne Lamirand, Marcio Soares, Aline Y. Ramos, Hélio Tolentino, Maurizio de Santis, et al.. Robust perpendicular exchange coupling in an ultrathin CoO/PtFe double layer: Strain and spin orientation. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2013, 88 (14), pp.140401(R). ⟨10.1103/PhysRevB.88.140401⟩. ⟨hal-00869637⟩
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