Abstract
We demonstrate an energy efficient method of radio frequency (RF) detection for two bands ( <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${S}+{C}$ </tex-math></inline-formula> and <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${X}-$ </tex-math></inline-formula> 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 <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${X}-$ </tex-math></inline-formula> band is discussed.
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