Fig. 3
From: Chemical potential of quasi-equilibrium magnon gas driven by pure spin current
Spectral distribution of spin current-driven magnon population. a, b BLS spectra recorded at I = −20 and 20 mA, respectively, (solid symbols) together with the reference spectrum obtained at I = 0 (open symbols) shifted in frequency by the value determined from the data of Fig. 2c. Vertical dashed lines in b mark the frequency ν min of the lowest-energy magnon state, and that of the quasi-uniform FMR mode. Note the logarithmic scale on the vertical axis. c The ratio of the spectra obtained with and without current. Dashed line is the mean value of the ratio for I = −20 mA. Solid curve is the fit of the ratio for I = 20 mA by Eq. (1), with T = T 0 and μ/h = 3.94 GHz
