Figure 1

Measurement of the ac voltage produced by parametric excitation in the parallel geometry. (a) is a schematic representation of $\pi /2$ magnons. (b),(c) are a comparative study of $V_{\mathrm{ac}}$, respectively with and without Al, when the same YIG location is excited. $V_{\mathrm{ac}}$ as a function of power and bias magnetic field (fixed pumping frequency) is shown in the insert. From there, the maximum $V_{\mathrm{ac}}$ for $P\le 24\mathrm{dBm}$ is plotted as a function of $f_p$. (d)–(f) Same measurement done on a slab covered successively by $\mathrm{Pt}/\mathrm{Al}/\mathrm{Pt}$, while the excitation antenna is scanned underneath the YIG.