Figure 2. ISHE-detected FMR spectroscopy in YIG|Pt microdiscs.

(a) Sketch of the sample and measurement configuration. The bias field H is oriented perpendicularly to the Pt electrode and to the excitation field h_rf produced by the antenna at fixed microwave frequency. The d.c. voltage V_x across Pt is monitored as a function of the magnetic field. (b) ISHE-detected FMR spectra of the 4- and 2-μm YIG(20 nm)|Pt(8 nm) discs at 1 and 4 GHz, respectively. (c) Dispersion relation of the main FMR mode of the microdiscs. The continuous line is a fit to the Kittel law. (d) Frequency dependence of the FMR linewidth in the two microdiscs. The continuous lines are linear fits to the data. The dashed line shows the homogeneous contribution of the bare YIG (the black triangles are the homogeneous contribution to the linewidth measured by standard FMR on the extended YIG film). The vertical bars show the mean squared error of the lorentzian fits.