Abstract
The magnetic and transport properties of high quality synthetic spin-valves with the structure of $\mathrm{Ta}∕\mathrm{Ni}\mathrm{Fe}∕\mathrm{Ir}\mathrm{Mn}∕\mathrm{Co}\mathrm{Fe}∕\mathrm{Ru}∕\mathrm{Co}\mathrm{Fe}∕\mathrm{NOL}∕\mathrm{Co}\mathrm{Fe}∕\mathrm{Cu}∕\mathrm{Co}\mathrm{Fe}∕\mathrm{CL}$ were studied by using magnetoresistance measurements. Here Ti, Hf, and Al are used as the capping layer. It is found that both the thickness and materials properties of the capping layers can affect the interlayer coupling field. The interlayer coupling field oscillates weakly with respect to the thickness of the Ti and Hf capping layers. Extremely strong ferromagnetic coupling has been observed when the thickness of the Al capping layer is in a certain range where resonant exchange coupling takes place. The strength of the interlayer coupling is inversely proportional to the square of the thickness of the spacer. It is a typical characteristic of quantum size effect.
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