Figure 3: Spin wave modes of the STO.
From: Nanowire spin torque oscillator driven by spin orbit torques
(a) ST-FMR spectrum of the nanowire device measured at the microwave drive frequency of 6 GHz, β=85° and Idc=2.0 mA<Ic. The red, blue and green sections of the curve represent the bulk modes, edge modes and the baseline, respectively. (b) Frequency versus magnetic field applied at β=85°: (squares) spin wave eigenmodes measured by ST-FMR, (crosses) self-oscillatory modes at Ic, and (lines) bulk and edge spin wave eigenmodes given by micromagnetic simulations for an ideal nanowire. Colour scheme: red and blue represent bulk and edge spin wave modes, respectively. (c) Bias current dependence of the integrated emitted power in three individual peaks of the bulk group of self-oscillatory modes as well as the sum of integrated powers of all bulk modes Pb. (d) Bias current dependence of the spectral linewidths (FWHM) of the individual peaks in the bulk group. Symbols in c and d: (green triangles) bulk mode 1, (blue triangles) bulk mode 2, (purple diamonds) bulk mode 3 and (red circles) the total power of three bulk modes.
