Figure 2: Microwave emission spectra from the Pt/Py nanowire spin torque oscillator.
From: Nanowire spin torque oscillator driven by spin orbit torques
Power spectral density (PSD) of the microwave signal emitted by the Pt/Py nanowire at direct current bias Idc=2.45 mA, bath temperature Tb=4.2 K and magnetic field H=890 Oe applied in the plane of the sample at an angle (a) β=85° and (b) β=80° with respect to the nanowire axis. The red, blue and green sections of the PSD curves correspond to the bulk spin wave modes, edge spin wave modes and the baseline, respectively. (c) Dependence of the emission spectrum on Idc for H=890 Oe and β=85°. The inset in a shows the spatial profiles of the edge (blue) and bulk (red) spin wave modes across the nanowire width given by micromagnetic simulations. The inset in b shows angular (β) dependence of the integrated power in the fundamental harmonic of the bulk group of spectral peaks (red squares), the second harmonic of the bulk group of peaks (red crosses) and the fundamental harmonic of the edge group of peaks (blue triangles) measured at Idc=2.4125, mA and H=890 Oe. Lines are guides to the eye.
