Figure 2
From: Coherent microwave generation by spintronic feedback oscillator
(a) Power spectral density (PSD) as a function of dc current ranging from −2.2 mA to −2.7 mA, with an applied magnetic field of 58 Oe along the y-axis. The amplifier gain was set to +24 dB. Inset shows the power spectral density for low dc current values, ranging between −1.7 mA to −2.1 mA. As the dc bias current increases, the peaks grow in amplitude and become sharper. The PSD for different currents shown in the inset are multiplied by various factors for clear visibility. (b) Variation of frequency and line width as a function of bias current. The narrow line width of 200 kHz obtained at −2.7 mA corresponds to a quality factor of ~12800. (c) The total power output as a function of dc bias current. The data is taken for Sample A.
