Figure 1

(a) Scanning electron microscopy (SEM) image of a Py nanowire device with five current-polarizing SAF nanocontacts and $\mathrm{Au}/\mathrm{Ta}$ top leads. (b) Schematic side view of the sample.Reuse & Permissions

Figure 2

(a) Evolution of ST-FMR spectra with increasing magnetic field applied parallel to a 240 nm wide nanowire. The curves are vertically offset for clarity. (b) ST-FMR spectrum showing three spin-wave resonances. (c), (d) Mode frequency versus field applied parallel to the nanowire for a 140 and a 240 nm wide wire. Symbols are data and lines are Eq. (1) fits with the nanowire width $w$ and the pinning parameter $\delta$ as fitting parameters. Inset in (c) is the dependence of the damping parameters of three spin-wave modes in the 240 nm wide nanowire on magnetic field. Inset in (d) shows the dispersion relation calculated from Eq. (1) for a 140 nm wire at 400 Oe. The dashed arrows indicate the two-magnon scattering channels, and the solid arrow shows the $k_x=0$ three-magnon confluence process active only at the field for which the frequency of the $n=1$ mode is half the frequency of the $n=3$ mode.Reuse & Permissions

Figure 3

(a), (b) Damping parameter of the first mode ${\tilde{\alpha }}_1$ versus field for 140 and 125 nm nanowires, showing a maximum of damping at a field $H_{\max }$ (425 and 550 Oe, respectively). (c) Damping versus ac drive current for the 125 nm wire at $H=H_{\max }$ (550 Oe) and $H<H_{\max }$ (375 Oe). (d) $H_{\max }$ versus frequency of the first mode at $H=H_{\max }$. Squares are data, line shows the field at which frequency of the third mode is equal to twice the frequency of the first mode as calculated from Eq. (1), data labels show the nanowire width obtained from Eq. (1) fit of the $f_n(H)$ data.Reuse & Permissions