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

Liu, X. H.; Liu, W.; Guo, S.; Gong, W. J.; Feng, J. N.; Zhang, Z. D.
August 2010
Applied Physics Letters;8/16/2010, Vol. 97 Issue 7, p072502
Academic Journal
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.


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