Abstract
The strength of ferromagnetic (FM) coupling as a function of the spacer thickness of Al2O3 was investigated by means of the Kerr microscopy used for analysis of magnetic domains. It was found that strong FM-coupling, strong uniaxial anisotropy and coherent rotation of the magnetization have been observed for the spacer thickness in the range of 0.2 nm ≤ t ≤ 1 nm, however weak FM-coupling, patch domains and 360°-walls occur for the spacer thickness of t = 2.5 nm. At a spacer thickness of t ≥ 5 nm transition takes place from weak FM-coupling to the decoupled state where complex interlayer interactions and different types of the domain walls were observed.
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