Vortex spin-torque diode: The impact of DC bias

摘要

We consider a vortex spin-torque diode represented by a magnetic tunnel junction with tilted magnetization in the fixed layer and vortex magnetization distribution in the free layer. Vortex dynamics and the corresponding spin-torque diode effect are analyzed using micromagnetic modelling for different input RF signal powers and different DC biases. The analytical model of the vortex spin-torque diode based on the Thiele equation is developed. We demonstrate that the considered spin-torque diode has sub-gigahertz resonant frequency, which can help to expand the frequency range of spintronic rectification. Relatively high sensitivity is observed in the case of ultra-low power even without the external magnetic field. Published by AIP Publishing.