Dual Band Radio Frequency Detector Based on the Simultaneous Excitation of Free and Reference Layer in a Magnetic Tunnel Junction

We demonstrate an energy efficient method of radio frequency (RF) detection for two bands ( ${S}+{C}$ and ${X}-$ band) using a magnetic tunnel junction-based nanopillar. For a carefully chosen geometry, two modes are simultaneously excited with the opposite sign of rectification voltage, enabling microwave band identification in a single device without the requirement for a DC bias. Micromagnetic simulations demonstrate that the opposite sign of rectification voltage is due to the simultaneous excitation of the free and reference layers. A method of enhancement of bandwidth in the ${X}-$ band is discussed.