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# optical and microwave fig 2.png

## Appears In

                        - Optical and Microwave Spectroscopy of Microelectronic Systems

**Normalized spin-wave spectra, as measured by BLS.** The measurements were carried out for the two opposite magnetization polarities (circles and triangles). The lines are fits to the data using the transmission function of the tandem multi-pass interferometer in the BLS spectrometer: ((f - f0)2 + Δf2)-6. The peak positions correspond to the frequencies of Stokes (negative frequencies) and anti-Stokes (positive frequencies) processes with a fixed wavevector of |**k**| = 16.7 μm-1. **a**, Data for a 1.3 nm Ni80Fe20 film with a 6 nm Pt underlayer with μ0H = ±295 mT. **b**, Data for a 2.0 nm Ni80Fe20 film with a 6nm Pt underlayer with μ0*H* = ±224 mT. The spin-wave frequency is clearly shifted by reversal of the magnetization direction in both **a** and **b**, and the frequency shift is reduced for the sample with 2.0 nm of Ni80Fe20. **c**, Data for a reference sample without Pt with μ0*H* = ±295 mT do not show a frequency shift that depends on either the magnetization direction or the spin-wave propagation direction.

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