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As the Internet of Things (IoT) becomes more integral to how we live ourlives and society becomes ever increasingly connected, the need for efficientnanoscale radio frequency detection is becoming more of a pressing issue. Thecommonly used technique of a superheterodyne conversion of the incoming signalto an intermediate frequency (IF), requires a relatively large electroniccircuit, including a local oscillator, mixer, various filters and a rectifier(i.e. diode). In order to radically simplify this process, we propose aspintronics-based nanometric single device whose resistance varies linearly asa function of the incoming frequency. This analogue frequency sensor allows adirect measurement of the incoming frequency and can work over many frequencybands and could replace a significantly larger conventional electronicscircuit, thus reducing the footprint and potentially the energy cost. Threetypes of operation of the frequency sensor are demonstrated: a HF/VHF sensorbased on a subharmonic modulation working across 9 different bands with 1-10MHz bandwidth and 200 kHz resolution, a VHF/UHF sensor based on directgyrotropic excitation operating between 150-225MHz with 250 kHz resolution anda UHF/SHF sensor based on indirect spin wave excitation operating between2-4GHz with a 2.5 MHz resolution.

A multi-band analogue frequency sensor with sub-MHz resolution based on a Vortex Nano-Oscillator