Exchange-biased SiO2/Co/CoO granular multilayers deposited by sequential sputtering

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:439

Article

Gamino, M.^1,2  Michea, S.³  Denardin, J. C.³  Schelp, L. F.²  Correa, M. A.⁴  Bohn, F.⁴  Dorneles, L. S.² 

[1] Univ Fed Pernambuco, Dept Fis, BR-50670901 Recife, PE, Brazil

[2] Univ Fed Santa Maria, Dept Fis, Av Roraima 1000, BR-97105900 Santa Maria, RS, Brazil

[3] Univ Santiago Chile, Avda Ecuador 3493, Santiago, Chile

[4] Univ Fed Rio Grande do Norte, Dept Fis, BR-59078900 Natal, RN, Brazil

关键词: Magnetic properties;    Exchange bias;    Extraordinary Hall effect;    Granular multilayers;   

DOI  :  10.1016/j.jmmm.2017.04.095

来源: Elsevier

【 摘 要 】

We investigate the magnetic properties in a system engineered to present Co grains laterally surrounded by a CoO matrix. By considering ferromagnetic SiO2/Co/CoO granular multilayers produced by sequential sputtering deposition, we verify that the Co grains present strong interfacial exchange coupling with the CoO matrix, assigned by the exchange bias effect as well as the raise of the Co blocking temperature. Morever, through magnetization and Hall resistivity experiments, we observe that the antiferromagnetic ordering temperature and exchange bias are dependent on the thickness of the antiferromagnetic material, attributed to finite size effects, as well as we find that the Co blocking temperature is raised as the CoO layer becomes thicker. We discuss the experimental results in terms of the growth mode of the layers, morphological properties of the multilayers, and temperature dependence of the magnetic behavior. The results place the sequential sputtering deposition as a promising alternative technique to produce Co/CoO granular multilayers. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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