Previously we have demonstrated that sputter deposited (Ni₈₀Fe₂₀/Au/Co/Au)_N multilayers (N-repetition number) exhibit easy-in-plane and out-of-plane magnetic anisotropy for permalloy and Co layers, respectively. Such structures are interesting because of possible applications as recording media or in magnetoresistive sensors with linear R(H) dependence. The perpendicular anisotropy of cobalt layers and the coupling between Co and Ni-Fe layers play a crucial role in both applications.

Two types of samples were studied: (i) sandwich structures with wedge shaped Au spacer and Co layers, (ii) multilayers with different thickness of Co (0.2 < t_Co < 2 nm), Au (0.5 < t_Au < 3 nm) layers and 5 < N < 15. The sandwich structures were investigated using multiscale magneto-optical methods based on the polar Kerr effect, whereas multilayers with VSM and magnetoresitance measurements (in our samples magnetoresistance effect of the GMR-type is observed). We have found that the Co layers exhibit perpendicular anisotropy in thickness range of 0.3 < t_Co < 1.2 nm. For the Au spacer layer thickness t_Au > 1 nm the interlayer coupling is weak and magnetization reversal of ferromagnetic layers is nearly independent. However, for multilayers exhibiting dense stripe domains structure (confirmed by MFM measurements) the ferromagnetic coupling strongly increases in the field range corresponding to the existence the domains structure.

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