GUIDING, SHAPING AND AMPLIFYING SIGNALS INSTRONGLY COUPLED ELECTROMAGNETICMAGNONICCIRCUITS

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Future progress of wireless communication requires the increase of the bandwidth, decreasing the energy consumption, and downscaling the size to the nanoscale. Working towards these goals entails combining knowledge from integrated photonics, microwave technology, materials science, nanoscale physics and magnetic-based information processing. Thereby, a key role can be played by magnonics, a field that harnesses low-energy magnetic excitations (or spin waves) for signal transmission and logic operation. Magnons carry information in broad frequency range from GHz up to THz and their wavelength is few orders of magnitude shorter than electromagnetic waves with same frequencies, which make magnons attractive for miniaturization. On the downside, coupling and converting magnetic to photonic signals is challenging due to different dispersions. State-of-the-art approaches of coupling electromagnetic waves to spin waves are mainly inductive involving microstrip lines and coplanar waveguides, whose sensitivity, scalability and energy efficiency need to be improved. Furthermore, controlling the propagation of magnonic signals in waveguides is hindered by internal magnetic interactions that control magnonic signals. For a further advance, new mechanisms and implementation concepts for enhancing the photon-magnon coupling are needed to render electromagnetic-magnonic circuits for use in the microwave and magnonic technology. The main objectives of this theory project are to envision new concepts for coupled magnonic-photonic devices for data processing and communication, and to formulate theoretical models amenable to numerical simulations, and to assess by realistic numerical modelling their practical feasibility and usefulness. Further analytical works aim at working out the underlying physical mechanisms for magnon-photon signal conversion and at identifying the suitable magnetically ordered materials that allow data processing by additional external parameters such as electric voltages and static magnetic fields. Concepts for generic logic operations will be developed and simulated for integration in magnonic-photonic circuits. To achieve these goals analytical and computational models for electromagnetic wave-spin wave coupled systems willbe developed. These will be used for designing microwave resonant elements with microwave field pattern of low TE/TM modes suitable for coupling with spin waves, and for studying ring resonator-based magnonic-photonics modes, including non-linear spin dynamics. To improve usefulness an increased magnonic power via resonator materials design will be investigated. Furthermore, we will study of the local magnetization excitations to control microwave circuits, while to enhance the coupling strength we will develop ferroelectric-dielectric-magnonic circuits and test the use of superconducting materials and synthetic antiferromagnetic materials to enhance the operational frequency above 100 GHz.