Multi-frequency microwave detection based on a spin-torque diode

In this work, we study a multi-frequency microwave detection phenomenon based on a spin-torque diode (STD). By applying appropriate bias current and magnetic field, the STD device is capable of simultaneously achieving high-sensitivity (over 4300 mV/mW) microwave detection at three microwave frequencies, with the highest sensitivity exceeding 14 000 mV/mW. Based on experiments, we characterized that this phenomenon is attributed to the simultaneous implementation of multi-mode excitation of direct-current excitation and injection locking mode which is driven by microwave input signals also contribute to this phenomenon. Based on our work, a way that develops a multi-frequency microwave detector for Internet of Things applications is provided.