Abstract:
The spectrums of standing exchange spin waves into magnetic sandwich Ni$_{80}$Fe$_{20}$/Cu($t_{\mathrm{Cu}}$)/Ni$_{80}$Fe$_{20}$ were studied by spin-wave resonance method. The layer of diamagnetic Cu depending on its thickness $t_{Cu}$ provided both positive and negative exchange interaction between ferromagnetic layers. It was shown that spin waves modes of SWR spectra which are described by well-known relation $H^{ac}_{res}(n)\sim n^2$, are standing acoustic exchange spin oscillations of individual ferromagnetic layers, regardless of a sign of interlayer exchange couple. It was detected that spin modes which are optical satellites of acoustic SWR peaks are described by the dependence of the resonance field $H^{op}_{res}(n)\sim n^{5/2}$ or $H^{op}_{res}(n)\sim n^2$ depending on the boundary conditions established on inner interfaces.
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