This paper presents a novel energy harvesting device that utilizes magnetic levitation to create a tunable oscillator. The system is designed to exploit nonlinear oscillations for improved energy harvesting. The governing equations for both mechanical and electrical domains are derived, showing that the system can be modeled as a Duffing oscillator under static and dynamic loads. Nonlinear analyses are conducted to investigate the energy harvesting potential of this system. Theoretical investigations are followed by experimental tests that validate the predictions. The device uses magnetic forces to levitate an oscillating center magnet, enabling the system's linear resonance to be tuned by adjusting the spacing between magnets. This eliminates the need for precise fabrication. The system's governing equations are formulated to show that it can be modeled with Duffing's equation under static and harmonic excitation. The frequency response analysis reveals that engaging the system's nonlinear response can improve energy harvesting. The paper describes the experimental setup, governing equations, and energy harvesting model. The system is analyzed under harmonic base excitation, and the frequency response is compared with theoretical predictions. The results show that the nonlinear system exhibits multiple periodic attractors and hysteresis, which are not present in linear systems. The power delivered to the electrical circuit is analyzed, showing that the maximum power can occur away from linear resonance. The experimental investigation compares the theoretical predictions with experimental measurements. The results show that the nonlinear system exhibits a wider range of responses and can capture energy from a broader range of excitation frequencies. The system's damping level significantly affects its response, and the maximum power output is influenced by the excitation frequency and amplitude. The paper concludes that the nonlinear response of the system can improve energy harvesting by allowing for a wider range of excitation frequencies and by enabling the system to operate away from linear resonance. The results demonstrate that the proposed energy harvesting device can effectively capture energy from nonlinear oscillations, offering a promising approach for energy harvesting applications.This paper presents a novel energy harvesting device that utilizes magnetic levitation to create a tunable oscillator. The system is designed to exploit nonlinear oscillations for improved energy harvesting. The governing equations for both mechanical and electrical domains are derived, showing that the system can be modeled as a Duffing oscillator under static and dynamic loads. Nonlinear analyses are conducted to investigate the energy harvesting potential of this system. Theoretical investigations are followed by experimental tests that validate the predictions. The device uses magnetic forces to levitate an oscillating center magnet, enabling the system's linear resonance to be tuned by adjusting the spacing between magnets. This eliminates the need for precise fabrication. The system's governing equations are formulated to show that it can be modeled with Duffing's equation under static and harmonic excitation. The frequency response analysis reveals that engaging the system's nonlinear response can improve energy harvesting. The paper describes the experimental setup, governing equations, and energy harvesting model. The system is analyzed under harmonic base excitation, and the frequency response is compared with theoretical predictions. The results show that the nonlinear system exhibits multiple periodic attractors and hysteresis, which are not present in linear systems. The power delivered to the electrical circuit is analyzed, showing that the maximum power can occur away from linear resonance. The experimental investigation compares the theoretical predictions with experimental measurements. The results show that the nonlinear system exhibits a wider range of responses and can capture energy from a broader range of excitation frequencies. The system's damping level significantly affects its response, and the maximum power output is influenced by the excitation frequency and amplitude. The paper concludes that the nonlinear response of the system can improve energy harvesting by allowing for a wider range of excitation frequencies and by enabling the system to operate away from linear resonance. The results demonstrate that the proposed energy harvesting device can effectively capture energy from nonlinear oscillations, offering a promising approach for energy harvesting applications.