Micromagnetic Study of Synchronization of Nonlinear Spin-Torque Oscillators to Microwave Current and Field

Figure 2

Response of the STO self-oscillation for 𝐻_DC=250 mT and 𝐽_DC=−5×10⁷ A/cm² as a function of the microwave source frequency when (a) 𝐽_RF=2×10⁷ A/cm², (b) 𝐻_RF=1 mT, and (c) RF current 𝐽_RF=1×10⁷ A/cm² and RF field 𝐻_RF=1 mT are applied together at the same frequency. The locking regions for the frequency ratio of 1 : 1 and 2 : 1 are also visible.

(a)

(b)

(c)