In this thesis, we explore the potential of magnonic systems for detecting gravitational variations. We begin by reviewing the theoretical foundations of magnetic materials an‎d magnons, followed by constructing a model that describes the interaction between gravitational fields an‎d ferromagnetic systems. Using the Holstein–Primakoff transformation, the spin-wave approximation, an‎d environmental noise considerations, we derive the systemʹs effective Hamiltonian. The dynamical behavior under a gravitational gradient is analyzed, an‎d the spectral response of the system to input fields is computed. Numerical results show that in the presence of a gravitational gradient, the resonance frequency of magnons shifts noticeably, which can be exploited for gravity sensing. A proposed experimental setup is presented for laboratory implementation. The sensitivity of this system is compared to other gravimeters, highlighting the advantages of magnons in quantum sensing. Finally, future directions such as using entanglement, squeezed light, an‎d quantum networks to enhance sensitivity are discussed.

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فرهاد شهبازي دستجرده

مهدي عبدي , حامد بخشيان