Simultaneous multitone microwave emission by dc-driven spintronic nano-element

• DOI: 10.1126/sciadv.adk1430
• Publication Date: 2023-12-13T18:59:05Z
• Authors: Alexandre Abbass ...; Denys Slobodianiuk; Rayan Moukhader; Gennadiy Melkov; Vladyslav Borynskyi; Morteza Mohseni; Giovanni Finocchio; Vitaly Lomakin; Roman Verba; Grégoire de Loubens; Philipp Pirro; Olivier Klein
• Keywords: Magnetization dynamics; Nanodot; Magnon; Spin wave; Magnonics; Nanopillar

Current-induced self-sustained magnetization oscillations in spin-torque nano-oscillators (STNOs) are promising candidates for ultra-agile microwave sources or detectors. While usually STNOs behave as a monochrome source, we report here clear bimodal simultaneous emission of incommensurate oscillations, where the two tones correspond to parametrically coupled eigenmodes with tunable splitting. The range is crucially sensitive change hybridization free and fixed layers, instance, through slight tilt applied magnetic field from normal nano-pillar. Our experimental findings supported both analytically by micromagnetic simulations, which ascribe process four-magnon scattering between pair radially symmetric magnon modes opposite azimuthal index. open up new possibilities cognitive telecommunications neuromorphic systems that use frequency multiplexing improve communication performance.