Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/71182
Type: Artigo
Title: Robust perpendicular exchange coupling in an ultrathin CoO/PtFe double layer: strain and spin orientation
Author: Lamirand, Anne D.
Soares, Márcio M.
Ramos, Aline Y.
Tolentino, Hélio C. N.
De Santis, Maurizio
Cezar, Julio C.
Siervo, Abner de
Jamet, Matthieu
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 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.
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 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.
Subject: Anisotropia magnética
Magnetização
Antiferromagnetismo
Country: Estados Unidos
Editor: American Physical Society
Citation: Physical Review B. Amer Physical Soc, v. 88, n. 14, 2013.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.88.140401
Address: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.88.140401
Date Issue: 2013
Appears in Collections:IFGW - Artigos e Outros Documentos

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