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Scheme of the sample layout and the experimental setup. A shorted CPW is used to excite spin waves in a stripe with dimensions of . The microwaves generated by a synthesizer are split and guided through two switches to the CPW (S1) and to the EOM (S2), respectively.
The intensity plot shows the interference of the light inelastically scattered at spin waves and the light of constant phase. For different applied magnetic fields (y-axis) the interference signal was measured as a function of the distance from the antenna (x-axis). The wavelength of the spin waves is determined by the spatial modulation of the interference signal, where black (white) represents constructive (destructive) interference, respectively.
(a) Theoretical spin-wave dispersions for different applied magnetic fields. (b) Wavelength of the excited spin waves as a function of the applied magnetic field. The solid line represents the calculated values extracted from the dispersions in (a). Red dots display the results extracted from the interference pattern in Fig. 2. Blue boxes show the results obtained from the phase profiles in Fig. 4(b).
(a) The four measurements required for the reconstruction of the spatial spin-wave phase profile. Dots are the conventional BLS signal, triangles are a measure of the signal solely generated by the EOM. Solid and dashed lines show the interfering spin-wave and EOM signals, in the dashed plot with an additional phase shift of of the EOM reference light. The plots are shifted vertically for clarity. (b) Phase profiles of the spin waves for various applied magnetic fields. Solid lines represent linear fits.
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