Fig. 6: Gyrotropic critical current modified by higher-order mode excitation.
a Critical current, Icrit, necessary to observe gyrotropic motion and b example spectra showing measured frequency, fMTJ, vs. excitation frequency, fsource, for a super-critical (IMTJ = 1.9 mA) and a sub-critical (IMTJ = 1.3 mA) dc current of a magnetic tunnel junction, MTJ, with diameter d = 300 nm. The circular arrows indicate the sense of propagation of the spin-wave mode.
