This paper investigates a novel energy harvesting device that utilizes magnetic levitation to produce an oscillator with tunable resonance. The governing equations for both the 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 explore the energy harvesting potential of this system. Theoretical investigations are followed by experimental tests that validate the response predictions. The study aims to exploit nonlinear phenomena to improve the effectiveness of energy harvesting devices, particularly in scenarios where the excitation frequency varies or is not aligned with the linear resonance. The results show that engaging the nonlinear response can lead to larger oscillations over a wider range of frequencies, potentially enhancing energy harvesting capabilities. The paper also discusses the impact of damping levels on the nonlinear response and compares the performance of the nonlinear device with a linear device, highlighting the advantages of the nonlinear approach in terms of response amplitude and frequency range.This paper investigates a novel energy harvesting device that utilizes magnetic levitation to produce an oscillator with tunable resonance. The governing equations for both the 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 explore the energy harvesting potential of this system. Theoretical investigations are followed by experimental tests that validate the response predictions. The study aims to exploit nonlinear phenomena to improve the effectiveness of energy harvesting devices, particularly in scenarios where the excitation frequency varies or is not aligned with the linear resonance. The results show that engaging the nonlinear response can lead to larger oscillations over a wider range of frequencies, potentially enhancing energy harvesting capabilities. The paper also discusses the impact of damping levels on the nonlinear response and compares the performance of the nonlinear device with a linear device, highlighting the advantages of the nonlinear approach in terms of response amplitude and frequency range.