Abstract
A model assuming exchange coupled layers is used to evaluate the interlayer exchange coupling strength, A12(tPt), and the effective uniaxial anisotropy field, Heff(tPt), within each Co layers as a function of the Pt thickness, tPt, from the perpendicular ferromagnetic resonance spectra for a series of Co/Pt multilayer films. It was found that A12(tPt) decreases exponentially with tPt having a characteristic length, t0 ∼ 7 A, indicating the importance of the polarization of Pt to mediate the interlayer exchange coupling between the Co layers. The decrease of Heff(tPt) with the increase of tPt also follows an exponential function of tPt with a decay length, τ ∼ 13 A, suggesting that the surface interaction on each Co/Pt interface is not fully developed unless the Pt layer thickness is greater than τ.
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