Abstract
A theoretical analysis is developed on spin-torque diode effect in nonlinear region. An analytical solution of the diode voltage generated from spin-torque oscillator (STO) by the rectification of an alternating current is derived. The diode voltage is revealed to depend nonlinearly on the phase difference between the oscillator and the alternating current. The validity of the analytical prediction is confirmed by numerical simulation of the Landau–Lifshitz–Gilbert equation. The results indicate that the spin-torque diode effect is useful to evaluate the phase of a STO in forced synchronization state.
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