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Strong effects of magnetic anisotropy on exchange coupling and magnetotransport properties of ferromagnetic/NiO/ferromagnetic trilayers

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6 Author(s)
Liu, X.H. ; Shenyang National Laboratory for Materials Science and International Centre for Materials Physics, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, People’s Republic of China ; Liu, W. ; Guo, S. ; Gong, W.J.
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Strong effects of the magnetic anisotropy on the exchange coupling are observed in FM1/NiO(6 nm)/FM2 trilayers with ferromagnetic (FM) layers Co or Fe. Different magnetic properties are found for Co/NiO/Fe and Fe/NiO/Co trilayers with Ag sublayer and cover layer. The Ag sublayer strongly affects the magnetic anisotropy of FM/antiferromagnetic (FM/AF) bilayers and further influences the exchange coupling in FM1/NiO/FM2 trilayers. In particular, the sign of the magnetoresistance changes from negative after zero-field cooling to positive after field cooling, which is due to a reversal of the Co spin polarization. Furthermore, the interfacial coupling between FM and NiO enhances the blocking temperature of NiO.

Published in:

Applied Physics Letters  (Volume:97 ,  Issue: 7 )

Date of Publication:

Aug 2010

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