Bilinear and biquadratic coupling constants of the trilayers vs interlayer thickness .
Easy axis magnetization curve of the coupled layer system measured by VSM. The solid line shows the simulated magnetization curve. The arrows show the different states of the magnetizations, obtained from the simulation. The frequencies of the optical mode (엯) in antiparallel configuration and acoustical mode (Δ) in canted and parallel configurations were deduced from the FFT of the time-domain PIMM data.
VNA-FMR measurements of the trilayer. The optical mode can be detected up to much higher fields with this measurement method.
Optical mode frequencies of the coupled system measured by PIMM and VNA-FMR at easy axis bias field of . Acoustical mode frequencies are measured by VNA-FMR at easy axis bias field of .
(Color online) Left: FFT of the PIMM signal of the trilayer after excitation by a pulse field of . Right: corresponding macrospin simulation. The color (online) indicates the mode intensities. The position of the optical and acoustical modes are similar as in Fig. 2 (right scale).
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