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

•The magnetic properties of CuO/Co and CuO/Ni thin films are investigated.•The CuO/Co and CuO/Ni systems show exchange bias below 200 and 5K, respectively.•At 5K, the CuO/Co film present rather high interface coupling and coercivity values.•Results suggest that the bias is due to reversal on the des...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2018-03, Vol.449, p.5-9
Main Authors: Gamino, M., de Andrade, A.M.H., Salazar Cuaila, J.L., Schmidt, J.E., Skumryev, V., Geshev, J.
Format: Article
Language:English
Subjects:
Bias
Coercivity
Coercivity enhancement
Exchange bias
Exchange coupling
Exchanging
Ferromagnetic materials
Hysteresis loops
Magnetic anisotropy
Magnetic fields
Magnetization reversal
Multiferroicity
Polycrystals
Studies
Thin films
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Summary:•The magnetic properties of CuO/Co and CuO/Ni thin films are investigated.•The CuO/Co and CuO/Ni systems show exchange bias below 200 and 5K, respectively.•At 5K, the CuO/Co film present rather high interface coupling and coercivity values.•Results suggest that the bias is due to reversal on the descending loop’s branch. 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 200K, while the CuO/Ni system exhibits bias below about 5K 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, 0.89erg/cm2, and coercivity, 2.44kOe, of the CuO/Co film are obtained at 5K.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2017.09.084