Exchange bias and major coercivity enhancement in strongly-coupled CuO/Co films

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:449

Article

Gamino, M.¹  de Andrade, A. M. H.¹  Salazar Cuaila, J. L.¹  Schmidt, J. E.¹  Skumryev, V.^2,3  Geshev, J.^1,2 

[1] Univ Fed Rio Grande do Sul, Inst Fis, BR-91501970 Porto Alegre, RS, Brazil

[2] Univ Autonoma Barcelona, Dept Fis, E-08193 Barcelona, Spain

[3] Inst Catalana Rec & Estudis Avancats, E-08010 Barcelona, Spain

关键词: Multiferroicity;    Magnetic anisotropy;    Exchange bias;    Exchange coupling;    Coercivity enhancement;   

DOI  :  10.1016/j.jmmm.2017.09.084

来源: Elsevier

【 摘 要 】

The exchange-bias properties of ferromagnetic, either Co or Ni, thin films deposited onto polycrystalline multiferroic CuO are investigated. After field cooling, the CuO/Co magnetization hysteresis loops show exchange bias at temperatures lower than 200 K, while the CuO/Ni system exhibits bias below about 5 K only. It is suggested that the exchange bias of CuO/Co is determined mainly by the magnetization reversal that takes place on the descending branch of the loop. Rather high values of both the interface coupling energy, 0.89 erg/cm(2), and coercivity, 2.44 kOe, of the CuO/Co film are obtained at 5 K. (C) 2017 Elsevier B.V. All rights reserved.

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