Figure 4

\({H}_{{\rm{sw}}}\) versus microwave field duration in the circularly polarized microwave field from CPWs 1 and 2 for \({f}_{{\rm{rf}}}\,=\,18\) GHz and \({H}_{{\rm{rf}}}=287\) Oe. The inset shows a waveform of signals with a zero rise/fall time and a 0.5-ns plateau time measured at the cable end connected to the CPWs.