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Type: Artigo de periódico
Title: Robust Perpendicular Exchange Coupling In An Ultrathin Coo/ptfe Double Layer: Strain And Spin Orientation
Author: Lamirand A.D.
Soares M.M.
Ramos A.Y.
Tolentino H.C.N.
De Santis M.
Cezar J.C.
De Siervo A.
Jamet M.
Abstract: 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 Néel antiferromagnetic ordering temperature of T 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. © 2013 American Physical Society.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.88.140401
Date Issue: 2013
Appears in Collections:Unicamp - Artigos e Outros Documentos

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