Figure 3
From: Single shot acquisition of spatially resolved spin wave dispersion relations using X-ray microscopy
(a) Snapshot of a time resolved STXM movie revealing the \(m_{z}\) component in DE geometry. The orange overlay illustrates ground (G) and signal (S) lines. (b) Experimental dispersion relation \(f( k_{\perp } )\). The emerging DE mode branch (darked color) perfectly fits the theoretical prediction (blue dotted line). The constant k-vectors for frequencies above \(f>2\hbox { GHz}\) are caused by electrical interference between the CPW and the photon detector. (c) Amplitude and phase maps of seven frequencies. The amplitude is encoded into brightness and the color represents the relative phase. As predicted, increasing the excitation frequency causes a decrease of spin wave wavelengths. (d) Snapshot of a time resolved STXM movie revealing the \(m_{z}\) component in BV geometry. (e) Experimental dispersion relation \(f( k_{\parallel } )\). The theoretical prediction (blue dotted line) fits the experimental results. Spin waves are excited between \(f=1\)–2 GHz with k-vectors up to \(k_{\parallel } = 3.5\,\upmu \hbox {m}^{-1}\). (f) Amplitude and phase maps of six frequencies. Excited spin waves can primarily be observed between the signal and ground lines and next to the ground lines which is caused by the excitation and field geometry.
