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(Color online) FMR mode positions for various excitation frequencies. The circles (crosses) represent the resonance mode of the free layer for the external field applied parallel (antiparallel) to the exchange-bias direction. The triangles at higher and lower fields show the positions of the optic and acoustic mode of the SAF, respectively. The lines connecting the data points of the SAF modes are a guide to the eye. Inset: Structure of the magnetic multilayer.
(Color online) FMR linewidth of the free-layer mode versus excitation frequency for parallel (right-pointing triangles) and antiparallel (left-pointing triangles) orientation of external magnetic field and exchange bias direction for a thickness of the upper SAF layer of 2.5 nm. The up-pointing triangles depict the linewidth for the sample with a 2 nm thick upper layer inthe antiparallel orientation. Inset: MOKE reversal loops for the samples with 2 nm (dashed line) and 2.5 nm upper SAF layer thickness (continuous line).
(Color online) Positions of the free-layer linewidth broadening for different thicknesses of the upper SAF layer. The right-pointing (left-pointing) triangles depict the data for the external magnetic field being parallel (antiparallel) to the exchange bias direction. The frequencies of the linewidth broadening were determined by subtracting the linear background of the linewidth as seen in Fig. 2 and fitting a Lorentzian peak to the remaining, non-linear part of the linewidth.
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